Publications of Robert D Guenther :chronological combined listing:
%% Papers Published
@article{9191646,
Author = {Qi Hao and Brady, D.J. and Guenther, B.D. and Burchett, J.B. and Shankar, M. and Feller, S.},
Title = {Human tracking with wireless distributed pyroelectric
sensors},
Journal = {IEEE Sens. J. (USA)},
Volume = {6},
Number = {6},
Pages = {1683 - 96},
Year = {2006},
url = {http://dx.doi.org/10.1109/JSEN.2006.884562},
Keywords = {Fresnel diffraction;lenses;pyroelectric detectors;sensor
fusion;target tracking;},
Abstract = {This paper presents a wireless pyroelectric sensor system,
composed of sensing modules (slaves), a synchronization and
error rejection module (master), and a data fusion module
(host), to perform human tracking. The computation workload
distribution among slave, master, and host is investigated.
The performances and costs of different signal-processing
and target-tracking algorithms are discussed. A prototype
system is described containing pyroelectric sensor modules
that are able to detect the angular displacement of a moving
thermal target. Fresnel lens arrays are used to modulate the
sensor field of view. The sensor system has been used to
track a single human target},
Key = {9191646}
}
@article{9324013,
Author = {Jian-Shuen Fang and Qi Hao and Brady, D.J. and Guenther,
B.D. and Hsu, K.Y.},
Title = {Real-time human identification using a pyroelectric infrared
detector array and hidden Markov models},
Journal = {Opt. Express (USA)},
Volume = {14},
Number = {15},
Year = {2006},
Keywords = {biometrics (access control);expectation-maximisation
algorithm;feature extraction;hidden Markov models;image
motion analysis;infrared detectors;lenses;optical
arrays;pyroelectric detectors;},
Abstract = {This paper proposes a real-time human identification system
using a pyroelectric infrared (PIR) detector array and
hidden Markov models (HMMs). A PIR detector array with
masked Fresnel lens arrays is used to generate digital
sequential data that can represent a human motion feature.
HMMs are trained to statistically model the motion features
of individuals through an expectation-maximization (EM)
learning process. Human subjects are recognized by
evaluating a set of new feature data against the trained
HMMs using the maximum-likelihood (ML) criterion. We have
developed a prototype system to verify the proposed method.
Sensor modules with different numbers of detectors and
different sampling masks were tested to maximize the
identification capability of the sensor system},
Key = {9324013}
}
@article{fds44506,
Author = {John Burchett and Mohan Shankar and A. Ben Hamza and B.D. Guenther and Nikos Pitsianis and David J. Brady},
Title = {Lightweight Biometric Detection System for Human
Classification using Pyroelectric Infrared
Detectors},
Journal = {Applied Optics},
Year = {2006},
Key = {fds44506}
}
@article{06109742883,
Author = {Cull, E.C. and Gehm, M.E. and Guenther, B.D. and Brady,
D.J.},
Title = {Standoff raman spectroscopy system for remote chemical
detection},
Journal = {Proceedings of SPIE - The International Society for Optical
Engineering},
Volume = {5994},
Pages = {59940 -},
Address = {Boston, MA, United States},
Year = {2005},
url = {http://dx.doi.org/10.1117/12.626170},
Keywords = {Remote sensing;Data reduction;Throughput;},
Abstract = {We have developed a class of aperture coding schemes for
Remote Raman Spectrometers (RRS) that remove the traditional
trade-off between throughput and spectral resolution. As a
result, the size of the remote interrogation region can be
driven by operational, rather than optical considerations.
In this paper we present the design of our coded-aperture
standoff spectroscopy system as well as experimental data
collected while making remote measurements.},
Key = {06109742883}
}
@article{9008262,
Author = {Shankar, M. and Burchett, J. and Feller, S.D. and Jones, B. and Swagart, R. and Guenther, B.D. and Brady,
D.J.},
Title = {Biometric tracking with coded pyroelectric sensor
clusters},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {5796},
Number = {1},
Pages = {181 - 92},
Address = {Orlando, FL, USA},
Year = {2005},
Keywords = {biometrics (access control);image classification;infrared
imaging;lenses;motion estimation;optical arrays;optical
sensors;pyroelectric detectors;},
Abstract = {Human bodies are very good heat sources with peak emission
wavelength of about 9 μm. We use pyroelectric detectors
that are differential in nature to detect human motion by
their heat emissions. Coded Fresnel lens arrays create
boundaries in space which helps to localize the human motion
as well as classification. We design and implement a
low-cost biometric tracking system using off-the-shelf
components. We demonstrate tracking and classification using
sensor clusters of dual-element pyroelectric detectors with
coded Fresnel lens arrays},
Key = {9008262}
}
@article{05429421140,
Author = {Cull, E.C. and Gehm, M.E. and McCain, S.T. and Guenther,
B.D. and Brady, D.J.},
Title = {Multimodal optical spectrometers for remote chemical
detection},
Journal = {Proceedings of SPIE - The International Society for Optical
Engineering},
Volume = {5778},
Number = {PART I},
Pages = {376 - 382},
Address = {Orlando, FL, United States},
Year = {2005},
url = {http://dx.doi.org/10.1117/12.606574},
Keywords = {Optical systems;Remote sensing;Raman scattering;Throughput;Spectrum
analyzers;},
Abstract = {We have developed a class of aperture coding schemes for
Remote Raman Spectrometers (RRS) that remove the traditional
trade-off between throughput and spectral resolution. As a
result, the size of the remote interrogation region can be
driven by operational, rather than optical considerations.
We present theoretical arguments on the performance of these
codes and present data from where we have utilized these
codes in other spectroscopy efforts.},
Key = {05429421140}
}
@article{8643962,
Author = {Yunhui Zheng and Brady, D.J. and Sullivan, M.E. and Guenther, B.D.},
Title = {Fiber-optic localization by geometric space coding with a
two-dimensional gray code},
Journal = {Appl. Opt. (USA)},
Volume = {44},
Number = {20},
Pages = {4306 - 14},
Year = {2005},
url = {http://dx.doi.org/10.1364/AO.44.004306},
Keywords = {binary codes;fibre optic sensors;Gray codes;image
sensors;optical tracking;},
Abstract = {With the objective of monitoring motion within a room, we
segment the two-dimensional (2D) floor space into discrete
cells and encode each cell with a binary code word generated
by a fiber. We design a set of k-neighbor-local codes to
localize an extended object and, particularly when k = 2,
employ a 2D gray code to localize a human by tracking his or
her footsteps. Methods for implementing the codes in a fiber
web are discussed, and we demonstrate the experimental
result with the fiber mat. The observed system performance
confirms the theoretical analysis. The space coding
technique is a promising low-cost candidate not only for
human tracking but also for other applications such as human
gait analysis},
Key = {8643962}
}
@article{fds44507,
Author = {B.D. Guenther},
Title = {Diffraction},
Volume = {2},
Booktitle = {Encyclopedia of Modern Optics},
Publisher = {Elsevier},
Editor = {B.D. Guenther,Editor in Chief},
Year = {2005},
Key = {fds44507}
}
@article{fds44508,
Author = {J.S. Murday and B.D. Guenther and C.G. Lau and C.R.K. Marrian and J.C.
Paxik and G.S. Pomrenke},
Title = {Overview of the Nanoscale Science and Technology Program in
teh Department of Defense},
Series = {ACS Symposium 891},
Pages = {2-14},
Booktitle = {Defense Applications of Nanomaterials},
Publisher = {American Chemicall Society},
Editor = {A.W. Miziolek and S.P. Karna and J.M. Mauro and R.A.
Vaia},
Year = {2005},
Key = {fds44508}
}
@article{fds44504,
Author = {B.D. Guenther and H. Weller and J.L. Godwin},
Title = {Report of the Bioterrorism Workshop},
Journal = {Journal of Microbiological Methods},
Volume = {51},
Pages = {247-254},
Year = {2002},
Key = {fds44504}
}
@article{fds44505,
Author = {B.D. Guenther and Chair},
Title = {Combat Hybrid Power System component Technologies”
Committee on Assessment of Combat Hybrid Power
Systems},
Booktitle = {National Materials Advisory Board, National Research
Council},
Publisher = {National Academies Press},
Year = {2002},
Key = {fds44505}
}
@article{01306591342,
Author = {Guenther, B.D. and Weller, H.R. and Godwin,
J.L.},
Title = {Search for nuclear isotopes for use in a nuclear
battery},
Journal = {Journal of Propulsion and Power},
Volume = {17},
Number = {3},
Pages = {540 - 546},
Year = {2001},
Keywords = {Nuclear batteries;Thermoelectricity;Electric
generators;Electrons;Electron energy levels;Electron
transitions;Gamma rays;Backscattering;},
Abstract = {Performance of a radioisotopic thermoelectric generator for
a human-portable energy source is discussed. The design of
thermoelectric generators is not considered. Instead
desirable characteristics of the radioisotope are used to
search for reasonable candidates with a half-life measured
in weeks and generating radiation that could easily be
shielded. Because radioisotopes with short half-lives would
have limited shelf-lives, a search was undertaken to
discover if isomers with different decay paths existed with
characteristics that would lead to a useful energy generator
design. The results indicate several interesting cases for
energy storage in radioactive isotopes. Two of the most
interesting cases uncovered were <sup>121</sup>Te and
<sup>254</sup>Es. However, intermediate levels that could be
used to connect the various nuclear energy levels are not
currently known. Measurements of transition rates that can
be stimulated between the desired levels are also needed to
determine the practicality of this concept. Such research is
now possible using the intense gamma beam that can be
produced using free-electron laser light backscattered from
relativistic electrons.},
Key = {01306591342}
}
@article{01246539807,
Author = {Demers, J.R. and Goyette, T.M. and Ferrio, K.B. and Everitt,
H.O. and Guenther, B.D. and De Lucia and F.C.},
Title = {Spectral purity and sources of noise in femtosecond-demodulation
terahertz sources driven by Ti:sapphire mode-locked
lasers},
Journal = {IEEE Journal of Quantum Electronics},
Volume = {37},
Number = {4},
Pages = {595 - 605},
Year = {2001},
url = {http://dx.doi.org/10.1109/3.914410},
Keywords = {Light modulation;Ultrafast phenomena;Laser mode
locking;Spectrum analysis;Frequencies;Timing jitter;Pumping
(laser);},
Abstract = {Direct measurements of the spectral purity in terahertz
femtosecond-demodulation sources are reported and compared
to theory. Because these sources operate at very high
harmonics ( [similar to] 10<sup>2</sup> - 10<sup>4</sup>) of
the mode-lock frequency, a high spectral purity source is
very dependent on a low-jitter femtosecond laser.
Conversely, the spectral content of the terahertz sources
provides detailed information about timing jitter and
stringent tests of models used to describe the jitter. We
find that both the behavior of the central core, and the
noise skirts of the power spectrum of our sources, can be
quantitatively related to measured ripple and continuum
amplitude noise on the Ar<sup>+</sup> pump laser by use of
modulation theory.},
Key = {01246539807}
}
@article{fds44502,
Author = {33) J.R. Demers and T.M. Goyette and K.B. Ferrio and H.O. Everitt and B.D. Guenther and F.C. DeLucia},
Title = {“Spectral Purity and Sources of Noise in
Femtosecond-Demodulation Terahertz Sources Driven by
Ti:Sapphire Mode-Locked Lasers},
Journal = {IEEE J. Quant Elect},
Volume = {QE37},
Pages = {595-605},
Year = {2001},
Key = {fds44502}
}
@article{fds44503,
Author = {B.D. Guenther and H. Weller and J.L. Godwin},
Title = {A Search for Nuclear Isotopes for Use in a Nuclear
Battery},
Journal = {AIAA J. Prop & Power},
Volume = {17},
Number = {3},
Year = {2001},
Key = {fds44503}
}
@article{6400670,
Author = {Iam Choon Khoo and Min-Yi Shih and Wood, M.V. and Guenther,
B.D. and Pao Hsu Chen and Simoni, F. and Slussarenko, S.S. and Francescangeli, O. and Lucchetti, L.},
Title = {Dye-doped photorefractive liquid crystals for dynamic and
storage holographic grating formation and spatial light
modulation},
Journal = {Proc. IEEE (USA)},
Volume = {87},
Number = {11},
Pages = {1897 - 911},
Year = {1999},
url = {http://dx.doi.org/10.1109/5.796353},
Keywords = {dyes;holographic gratings;holographic storage;liquid crystal
devices;multiwave mixing;nematic liquid crystals;optical
films;refractive index;space charge;spatial light
modulators;},
Abstract = {The basic mechanisms of photo-induced space charge field
formation, director axis re-orientation, and refractive
index changes in fullerene C60- and dye-doped nematic liquid
crystals films are presented. In particular, in aligned
methyl-red-doped nematic liquid crystal film, we observe a
nonlinear index change coefficient as high as 10
cm<sup>2</sup>/W, associated with purely optically induced
liquid crystal director axis re-orientation. Experimental
observations of dynamic and high-resolution storage
holographic grating formation, two beam coupling with gain
of nearly 3000 cm<sup>-1</sup>, optical limiting action at
nanowatt cw laser power, and incoherent-coherent image
conversion at μW/cm<sup>2</sup> light intensity level are
discussed},
Key = {6400670}
}
@article{99104830904,
Author = {Peyghambarian, N. and Ferrio, K.B. and Herlocker, J.A. and Hendrickx, E. and Guenther, B.D. and Kippelen, B. and Mery,
S.},
Title = {Photorefractive polymers with video-rate
performance},
Journal = {Proceedings of SPIE - The International Society for Optical
Engineering},
Volume = {3749},
Pages = {336 - 337},
Address = {San Francisco, CA, USA},
Year = {1999},
url = {http://dx.doi.org/10.1117/12.354773},
Keywords = {Vinyl resins;Chromophores;Birefringence;Photoconductivity;Transparency;Photosensitizers;Diffraction
gratings;Electric field effects;Ellipsometry;Electric
potential;},
Abstract = {The introduction of birefringent chromophores with
ground-state dipole moments into a photoconductive polymer
host has provided the design flexibility to improve both
dynamic range and speed. From the diffraction efficiency and
Kogelnik's theory of thick gratings, it exhibits a dominant
response time of approximately 2 ms for the underlying
index-modulation with an additional slow component of
approximately 1 ms and may support applications requiring
video-rates. The orientational mobility of the chromophores
is not limiting the response of the composite and
kiloherts-regime responses may be achievable with improved
photoconductivity.},
Key = {99104830904}
}
@article{6520139,
Author = {Ferrio, K.B. and Herlocker, J.A. and Hendrickx, E. and Guenther, B.D. and Peyghambarian, N. and Kippelen, B. and Mery, S.},
Title = {Charge transport and chromophore orientation in a new
photorefractive polymer composite with response-time in the
millisecond-regime},
Journal = {Technical Digest. Summaries of papers presented at the
Conference on Lasers and Electro-Optics. Postconference
Edition. CLEO '99. Conference on Lasers and Electro-Optics
(IEEE Cat. No.99CH37013)},
Pages = {510 - 11},
Address = {Baltimore, MD, USA},
Year = {1999},
url = {http://dx.doi.org/10.1109/CLEO.1999.834518},
Keywords = {carrier mobility;filled polymers;optical modulation;optical
polymers;photoconducting materials;photorefractive
materials;},
Abstract = {Summary form only given. Since the first observation of
photorefractivity in a polymer composite, applications to
information-processing and dynamic holography have spurred
rapid development. A critical step was the realization that
index-modulation is enhanced by reorientation of
birefringent chromophores in composites with low
glass-transition temperatures, T<sub>g</sub>. Now attention
has turned to understanding and improving response-times. A
composite with a 4-ms component has been reported recently,
with persuasive evidence that photoconductivity limits
speed. We report an even faster 1.8-ms component in a very
different composite a fluorinated cyanotolane
chromophore},
Key = {6520139}
}
@article{99104821307,
Author = {Herlocker, J.A. and Ferrio, K.B. and Hendrickx, E. and Guenther, B.D. and Mery, S. and Kippelen, B. and Peyghambarian, N.},
Title = {Direct observation of orientation limit in a fast
photorefractive polymer composite},
Journal = {Applied Physics Letters},
Volume = {74},
Number = {16},
Pages = {2253 - 2255},
Year = {1999},
url = {http://dx.doi.org/10.1063/1.123816},
Keywords = {Vinyl resins;Fluorine containing polymers;Chromophores;Four
wave mixing;Photosensitizers;Refractive index;Ellipsometry;Diffraction
gratings;Birefringence;Light absorption;},
Abstract = {The photorefractivity and chromophore orientation in polymer
composites were studied. The composites were made from
poly-N-vinylcarbazole, N-ethylcarbazole, and
(2,4,7-trinitro-9-fluorenylidene)malonodinitrile with a
fluorinated cyano-tolane chromophore. The transient
photorefractive response in four-wave mixing (FWM) and
two-beam coupling (TBC) was measured. Transient FWM revealed
a photorefractive response dominated by a fast time constant
of 4 ms, while transient ellipsometry revealed an
orientational response of only 490 μs.},
Key = {99104821307}
}
@article{00025024609,
Author = {Peyghambarian, N. and Ferrio, K.B. and Herlocker, J.A. and Handrickx, E. and Guenther, B.D. and Mery, S. and Zhang, Y. and Kippelen, B.},
Title = {Photorefractive polymers with high speed},
Journal = {Materials Research Society Symposium - Proceedings},
Volume = {561},
Pages = {131 - 139},
Address = {San Francisco, CA, USA},
Year = {1999},
Keywords = {Photorefractive materials;Diffraction gratings;Nonlinear
optics;Four wave mixing;Optical devices;Holograms;},
Abstract = {Rapid progress in photorefractive polymers includes new
materials with improved response rates. We briefly review
recent developments in this rapidly evolving area and report
grating formation with a 2-millisecond time-constant, the
fastest reported to date in any photorefractive
polymer.},
Key = {00025024609}
}
@article{99104859733,
Author = {Herlocker, Jon A. and Ferrio, Kyle B. and Hendrickx, Eric and Guenther, B.D. and Mery, Stephane and Kippelen, Bernard and Peyghambarian, Nasser},
Title = {Observation of 4-ms response-time in a photorefractive
polymer},
Journal = {Proceedings of SPIE - The International Society for Optical
Engineering},
Volume = {3623},
Pages = {168 - 174},
Address = {San Jose, CA, USA},
Year = {1999},
url = {http://dx.doi.org/10.1117/12.348395},
Keywords = {Organic polymers;Diffraction gratings;Ellipsometry;Optical
properties;Electric field effects;},
Abstract = {Efficient photorefractive polymers hold great potential for
optical data processing and storage and so have been a topic
of intense investigations in recent years. Materials with
nearly 100% diffraction efficiencies have been developed,
but these have been generally characterized by much slower
responses than their less efficient inorganic counterparts.
In this report, we describe a 4-ms initial rise-time using a
visible-transparent chromophore in a PVK-based polymer of
T<sub>g</sub> = 39°C for 48-V/µm bias projected
along the grating vector and 250-m W/cm<sup>2</sup> writing
beams. This fast component consistently accounts for 90% of
the steady-state response and is analyzed as a function of
bias field. We also present transient ellipsometry
measurements of an orientational response significantly
faster than the grating development, suggesting that
chromophore alignment speed does not limit transient grating
formation. We describe the role of such underlying property
measurements in understanding photorefractive transient
behavior, and prospects for further improvements.},
Key = {99104859733}
}
@article{6397883,
Author = {Hendrickx, E. and Guenther, B.D. and Zhang, Y. and Wang,
J.F. and Staub, K. and Zhang, Q. and Marder, S.R. and Kippelen, B. and Peyghambarian, N.},
Title = {Ellipsometric determination of the electric-field-induced
birefringence of photorefractive dyes in a liquid carbazole
derivative},
Journal = {Chem. Phys. (Netherlands)},
Volume = {245},
Number = {1-3},
Pages = {407 - 15},
Year = {1999},
url = {http://dx.doi.org/10.1016/S0301-0104(99)00049-X},
Keywords = {birefringence;dyes;ellipsometry;organic compounds;photorefractive
materials;polarisability;},
Abstract = {We have used ellipsometric measurements on solutions of
2-dihexylamino-7-dicyanomethylidene-3,4,4a,5,6-pentahydronaphthalene
and related polyenes in liquid 9-(2'-ethylhexyl)carbazole to
measure the electric-field-induced birefringence at
wavelengths of 690 nm and 830 nm. This electric-field-induced
birefringence is related to the product of dipole moment
squared and the polarizability anisotropy,
μ<sup>2</sup>Δα, and to a large extent
determines the dye's photorefractive figure-of-merit (FOM).
We show that μ<sup>2</sup>Δα increases with
the conjugation length and report one of the highest
μ<sup>2</sup>Δα values observed so
far},
Key = {6397883}
}
@article{98084340144,
Author = {Khoo, I.C. and Slussarenko, S. and Guenther, B.D. and Shih,
Min-Yi and Chen, P. and Wood, W.V.},
Title = {Optical nonlinear index coefficient of over 6
cm2/W in dye-doped nematic liquid
crystals},
Journal = {Conference on Lasers and Electro-Optics Europe - Technical
Digest},
Pages = {215 - 216},
Address = {San Francisco, CA, USA},
Year = {1998},
url = {http://dx.doi.org/10.1109/CLEO.1998.676075},
Keywords = {Nematic liquid crystals;Optical materials;Refractive
index;Diffraction gratings;Dye lasers;Thick
films;},
Abstract = {The observation of an extraordinarily large purely optically
induced refractive index change mechanism in methyl-red
dye-doped nematic liquid crystal film is reported. A
refractive index change coefficient of over 6
cm<sup>2</sup>/W was obtained. Visually observable
self-diffraction and holographic grating diffraction can be
generated with optical intensity as low as 40
μW/cm<sup>2</sup>. The response times are measured to be
in the milliseconds regime.},
Key = {98084340144}
}
@article{98034118987,
Author = {Khoo, I.C. and Slussarenko, S. and Guenther, B.D. and Shih,
Min-Yi and Chen, P. and Wood, W.V.},
Title = {Optically induced space-charge fields, dc voltage, and
extraordinarily large nonlinearity in dye-doped nematic
liquid crystals},
Journal = {Optics Letters},
Volume = {23},
Number = {4},
Pages = {253 -},
Year = {1998},
Key = {98034118987}
}
@article{6216736,
Author = {Khoo, I.C. and Wood, M.V. and Chen, P. and Min-Yi Shih and Guenther, B.D.},
Title = {Self-defocusing and optical limiting of nanoWatt cw laser
and image processing at μ Watt/cm2 intensity
with nematic liquid crystals},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {3475},
Pages = {143 - 9},
Address = {San Diego, CA, USA},
Year = {1998},
url = {http://dx.doi.org/10.1117/12.326900},
Keywords = {image processing;liquid crystal devices;nematic liquid
crystals;optical limiters;refractive index;spatial light
modulators;},
Abstract = {Using nematic liquid crystal films doped with photocharge
producing dyes, we have demonstrated the feasibility of
optical limiting of long pulse-cw lasers at nanowatt power,
and clamped transmission of ≪1 μJ. We also
demonstration incoherent-coherent image conversion
capability with optical intensity in the
μWatt/cm<sup>2</sup> level},
Key = {6216736}
}
@article{5856220,
Author = {Khoo, I.C. and Wood, M.V. and Guenther, B.D.},
Title = {Liquid crystals for fast infrared laser switching and
optical limiting application},
Journal = {Materials for Optical Limiting II. Symposium},
Pages = {229 - 34},
Address = {San Franicso, CA, USA},
Year = {1998},
Keywords = {electro-optical switches;liquid crystal devices;molecular
reorientation;multiwave mixing;nematic liquid
crystals;nonlinear optics;},
Abstract = {We present the results of several experimental studies of
infrared [IR] nonlinear optical responses of aligned nematic
liquid crystals, including laser induced molecular
reorientation, density-, thermal- and order
paramter-changes, optical wave mixing, beam amplification,
and interface switching effects. Using lasers in the near-IR
[1.55 μm], mid-IR [5 μm] and IR [10.6 μm] spectral
regime, the potentials for nonlinear optical applications
with CW, millisecond to microsecond lasers are
explored},
Key = {5856220}
}
@article{5856221,
Author = {Khoo, I.C. and Wood, M.V. and Guenther, B.D.},
Title = {Nonlinear optical fiber core materials for optical limiting
application},
Journal = {Materials for Optical Limiting II. Symposium},
Pages = {241 - 7},
Address = {San Franicso, CA, USA},
Year = {1998},
Keywords = {arrays;high-speed optical techniques;liquid crystal
devices;nonlinear optics;optical fibres;},
Abstract = {Several liquid phase liquid crystals and liquids are found
to possess broadband nonlinear absorption characteristics
suitable for optical limiting applications. Using these
liquids as fiber waveguiding cores, we have developed fiber
arrays that provide excellent limiting performance
characteristics against frequency agile visible laser pulses
in the nanosecond-picosecond time scale. These fiber arrays
are compact, low cost/weight, and are capable of
transmitting high quality images throughout the entire
visible spectrum},
Key = {5856221}
}
@article{6508149,
Author = {Khoo, I.C. and Guenther, B.D. and Slussarenko,
S.},
Title = {Photo-induced space charge fields, photo-voltaic,
photorefractivity, and optical wave mixing in nematic liquid
crystals},
Journal = {Mol. Cryst. Liq. Cryst. (Switzerland)},
Volume = {321},
Pages = {863 - 82},
Address = {Heppenheim an der Bergstrasse, Germany},
Year = {1998},
Keywords = {electro-optical effects;holographic gratings;holographic
storage;multiwave mixing;nematic liquid crystals;photoconductivity;photorefractive
effect;space charge;},
Abstract = {We present a detailed discussion of the fundamental
mechanisms for recently observed nonlinear electro-optical
wave mixing effects in nematic liquid crystal films.
Experimental results on photoconductivity,
photorefractive-like two beam coupling, beam amplification,
self-diffraction, and storage holographic grating formation
in dye- and fullerene C<sub>60</sub> and C<sub>61</sub>
doped nematic films are presented along with a review of
two- and four-wave mixing theories. Nematic liquid crystal
films are shown to be potentially useful for adaptive and
optical storage applications},
Key = {6508149}
}
@article{6190962,
Author = {Khoo, I.C. and Wood, M.V. and Chen, P. and Min-Yi Shih and Guenther, B.D.},
Title = {Novel liquid-cored fiber and liquid crystal film for sensor
protection against visible ps-cw lasers},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {3472},
Pages = {30 - 9},
Address = {San Diego, CA, USA},
Year = {1998},
url = {http://dx.doi.org/10.1117/12.326888},
Keywords = {high-speed optical techniques;laser beam effects;nematic
liquid crystals;optical fibres;optical films;optical
limiters;optical saturable absorption;optical
self-focusing;optical sensors;radiation protection;two-photon
processes;},
Abstract = {We have developed compact millimeter thick optical fiber
arrays with nonlinear optical liquid guiding cores. These
image transmitting fiber arrays are capable of passive
optical limiting action against frequency agile short
(picosecond-nanosecond) laser pulses in the visible
spectrum. We present the results of further studies of their
limiting performance. We also discuss how a recently
discovered extraordinarily large nonlinear optical response
of methyl-red doped nematic liquid crystal film may be
employed for limiting action on longer pulse or cw lasers
with nanowatt threshold power},
Key = {6190962}
}
@article{98074282885,
Author = {Khoo, I.C. and Wood, M.V. and Guenther, B.D. and Shih,
Min-Yi and Chen, P.H.},
Title = {Nonlinear absorption and optical limiting of laser pulses in
a liquid-cored fiber array},
Journal = {Journal of the Optical Society of America B: Optical
Physics},
Volume = {15},
Number = {5},
Pages = {1533 - 1540},
Year = {1998},
Keywords = {Light absorption;Optical fibers;Molecular
structure;Molecules;Refractive index;Fullerenes;Liquid
crystals;Laser pulses;Neodymium lasers;Numerical
methods;},
Abstract = {A model for the nonlinear molecular photonic processes
occurring in the fiber-core liquid molecules was developed.
The model was used to analyze the nonlinear transmission of
nanosecond and picosecond laser pulses through these fibers.
In the picosecond regime, nonlinear absorptions play the
dominant role, whereas in the nanosecond regime,
thermal-density effects are further required for achieving
comparable limiting performance characteristics. The
thresholds and limited-clamped output from these fiber
structures are below sensor damage levels.},
Key = {98074282885}
}
@article{99024581921,
Author = {Khoo, I.C. and Shih, M.Y. and Chen, Ph. and Wood, M. and Guenther, B.D.},
Title = {Nematic liquid crystal film with a nonlinear index
coefficient of over 10 cm2/Watt and ms response
speed},
Journal = {Conference Proceedings - Lasers and Electro-Optics Society
Annual Meeting-LEOS},
Volume = {2},
Pages = {201 - 202},
Address = {Orlando, FL, USA},
Year = {1998},
url = {http://dx.doi.org/10.1109/LEOS.1998.739530},
Keywords = {Nematic liquid crystals;Birefringence;Electric
potential;Refractive index;Electric space
charge;Anisotropy;Dyes;Light modulators;Diffraction
gratings;Nonlinear optics;Adaptive optics;},
Abstract = {Liquid crystals posses large birefringence spanning the
visible to infrared spectral regime and large optical
nonlinearities. One advantage of dye doped nematic liquid
crystal (DDLC) over a commercial liquid crystal spatial
light modulators (SLM) is the resolution capability. The
resolution of DDLC can be over 200 lp/nm compared to
commercial SLM's typical resolution capability of at most 40
lp/nm. Since many dyes exist that will cover a wide
spectrum, these DDLC films are promising candidates for
developing broadband optical modulators and limiters,
adaptive optics and dynamic holographic optical devices and
for wavelength or coherent-incoherent image conversion
devices.},
Key = {99024581921}
}
@article{98084340364,
Author = {Khoo, I.C. and Guenther, B.D. and Shih, Min-Yi and Chen,
P.H. and Wood, M.V.},
Title = {Optical limiting of submicrowatt long-pulse cw lasers with
extremely nonlinear nematic liquid crystal
films},
Journal = {Conference on Lasers and Electro-Optics Europe - Technical
Digest},
Pages = {374 - 375},
Address = {San Francisco, CA, USA},
Year = {1998},
url = {http://dx.doi.org/10.1109/CLEO.1998.676330},
Keywords = {Limiters;Nematic liquid crystals;Nonlinear
optics;Focusing;Diffraction gratings;Light
polarization;Light absorption;Band structure;Optical
variables measurement;Refractive index;},
Abstract = {The feasibility of optical limiting with submicrowatt laser
power at milliseconds speed is demonstrated. Because many
dyes exist that will cover the entire visible spectrum, such
dye-doped nematic films are highly promising candidates for
application as very broadband optical limiters. These films
can be easily integrated onto other optical limiting devices
to fabricate devices that will provide protection against
frequency agile picosecond cw lasers.},
Key = {98084340364}
}
@article{5961991,
Author = {Khoo, I.C. and Wood, M.V. and Guenther, B.D. and Min-Yi Shih and Chen, P.H. and Zhaogen Chen and Xumu
Zhang},
Title = {Nonlinear optical liquid cored fiber array and liquid
crystal film for ps-CW frequency agile laser optical
limiting application},
Journal = {Optics Express},
Volume = {2},
Number = {12},
Year = {1998},
Keywords = {arrays;high-speed optical techniques;liquid films;nematic
liquid crystals;nonlinear optics;optical fibres;organic
compounds;},
Abstract = {The molecular nonlinear photonic absorption processes of two
nonlinear fiber core liquids are discussed in the context of
nonlinear propagation and optical limiting of short pulses,
these fiber arrays are capable of limiting threshold and
clamped output below 1 μJ for picosecond and nanosecond
pulses. We also discuss the observation of perhaps the
largest optical nonlinearity in some dye-doped nematic
liquid crystal films. These films provide limiting action
with a threshold power of 100 nWatt and limited transmission
of ≪1 microJoule for ms-CW laser},
Key = {5961991}
}
@article{97103894974,
Author = {Ratches, James A. and Walters, C.P. and Buser, Rudolf G. and Guenther, B.D.},
Title = {Aided and automatic target recognition based upon sensory
inputs from image forming systems},
Journal = {IEEE Transactions on Pattern Analysis and Machine
Intelligence},
Volume = {19},
Number = {9},
Pages = {1004 - 1019},
Year = {1997},
url = {http://dx.doi.org/10.1109/34.615449},
Keywords = {Image sensors;Military applications;Algorithms;Sensor data
fusion;Mathematical models;Signal to noise ratio;Data
acquisition;Database systems;},
Abstract = {This paper systematically reviews 10 years of research that
several Army Laboratories conducted in object recognition
algorithms, processors, and evaluation techniques. In the
military, object recognition is applied to the
discrimination of military targets, ranging from human-aided
to autonomous operations, and is called Automatic Target
Recognition (ATR). The research described here has been
concentrated in human-aided target recognition applications,
but some attention has been paid to automatic processes.
Definitions and performance metrics that have been developed
are described along with performance data showing the
present state-of-the-art. The effects of signal-to-noise and
clutter parameters are indicated in the data. Multisensor
fusion and model-based algorithms are discussed as the
latest techniques under consideration by the military
research community. The results demonstrate that useful
performance can be achieved, and tools are evolving to
understand and improve the performance under real-world
conditions. The referenced research strongly indicates the
need for the development of image science, as described in
the paper, to support the theoretical underpinnings of
ATR.},
Key = {97103894974}
}
@article{5831130,
Author = {Khoo, I.C. and Wood, M.V. and Min-Yi Shih and Guenther, B.D. and Chen, P.},
Title = {Analytical modeling of nonlinear-and excited
state-absorption and optical limiting in a liquid-cored
fiber array},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {3146},
Pages = {125 - 32},
Address = {San Diego, CA, USA},
Year = {1997},
Keywords = {excited states;high-speed optical techniques;image
resolution;limiters;nonlinear optics;optical fibre
communication;optical fibres;optical materials;visual
communication;},
Abstract = {Recently observed optical limiting effects of nano-and
pico-second laser pulses through a fiber array are analyzed
using a model that accounts for various nonlinear and
excited state absorption, and subsequent thermal and density
effects occurring in the fiber guiding core materials. The
nonlinear liquid cored-fiber arrays we have constructed are
capable of low optical limiting threshold and clamped
output, as well as high resolution image
transmission},
Key = {5831130}
}
@article{97093804540,
Author = {Khoo, I.C. and Guenther, B.D. and Wood, M.V. and Chen, P. and Shih, Min-Yi},
Title = {Coherent beam amplification with a photorefractive liquid
crystal},
Journal = {Optics Letters},
Volume = {22},
Number = {16},
Pages = {1229 - 1231},
Year = {1997},
Keywords = {Light refraction;Nematic liquid crystals;Thin
films;Fullerenes;Diffraction gratings;Laser
applications;Four wave mixing;},
Abstract = {This report discusses the enhancement of the beam-coupling
effect with the use of a more efficient photocharge-producing
dopant such as fullerene C60 and a much larger effective
applied dc field in thinner liquid-crystal films. More
importantly, it is shown that the beam-amplification process
is accompanied by negligible phase cross talk between pump
and the signal beams similar to those observed in
photorefractive crystals.},
Key = {97093804540}
}
@article{5831115,
Author = {Guenther, B.D. and Khoo, I.C.},
Title = {Beam amplification and cleanup with two-and four-wave mixing
in photorefractive nematic liquid crystal
films},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {3143},
Pages = {191 - 200},
Address = {San Diego, CA, USA},
Year = {1997},
Keywords = {adaptive optics;liquid crystal devices;multiwave
mixing;nematic liquid crystals;optical crosstalk;optical
films;photorefractive materials;},
Abstract = {Recent theoretical and experimental results have shown that
the orientational photorefractive effect seen in doped
nematic liquid crystal films gives rise to strong beam
amplification effects without suffering from phase
crosstalk. These effects, examined for both four and two
wave mixing, are well suited for adaptive optics
applications},
Key = {5831115}
}
@article{5434860,
Author = {Khoo, I.C. and Wood, M.V. and Lee, M. and Guenther,
B.D.},
Title = {Nonlinear liquid-crystal fiber structures for passive
optical limiting of short laser pulses},
Journal = {Opt. Lett. (USA)},
Volume = {21},
Number = {20},
Pages = {1625 - 7},
Year = {1996},
Keywords = {fluctuations;high-speed optical techniques;laser beam
effects;laser beams;light absorption;light
scattering;limiters;liquid crystal devices;nonlinear
optics;optical fibres;refractive index;thermo-optical
effects;},
Abstract = {Optical limiting of nanosecond and picosecond laser pulses
through millimeter-length isotropic liquid-crystal-cored
fiber structures is reported. Low limiting threshold and
clamped transmitted outputs are observed. The underlying
nonlinear mechanisms are nonlinear photoabsorptions and
scattering and lossy waveguiding caused by laser-induced
thermal-density index fluctuations},
Key = {5434860}
}
@article{97013496365,
Author = {Simoni, F. and Francescangeli, O. and Reznikov, Y. and Slussarenko, S. and Khoo, I.C. and Wood, M. and Guenther,
B.D.},
Title = {Optical holographic grating formation in dye- and
fullerene-doped liquid crystalline system},
Journal = {Conference Proceedings - Lasers and Electro-Optics Society
Annual Meeting-LEOS},
Volume = {1},
Pages = {265 -},
Address = {Boston, MA, USA},
Year = {1996},
url = {http://dx.doi.org/10.1109/LEOS.1996.565232},
Keywords = {Nematic liquid crystals;Fullerenes;Semiconducting
films;Semiconductor doping;Polymeric glass;Holographic
interferometry;Nonlinear optics;Optical properties;Birefringence;Photolithography;},
Abstract = {The nonlinear optical properties of nematic liquid crystal
films doped with dyes of fullerene C<sub>60</sub> are
studied. Nematic liquid crystals were doped with azo-dyes,
and tested for their optical storage capabilities. An
electro-optical holographic storage grating effect is
observed in C<sub>60</sub>-doped nematic liquid crystal
films. The effect is attributed to molecular axis
reorientation caused by the combination of an applied DC
field and an optically induced DC space charge. The observed
nonlinear sensitivity of the films is larger than that of
other materials studied.},
Key = {97013496365}
}
@article{5385274,
Author = {Guenther, B.D. and Narayanan, R.M.},
Title = {Vegetation obscuration effects on mid-infrared laser
reflectance of soil},
Journal = {IGARSS '96. 1996 International Geoscience and Remote Sensing
Symposium. Remote Sensing for a Sustainable Future (Cat.
No.96CH35875)},
Volume = {vol.1},
Pages = {445 - 7},
Address = {Lincoln, NE, USA},
Year = {1996},
url = {http://dx.doi.org/10.1109/IGARSS.1996.516368},
Keywords = {geochemistry;geophysical techniques;infrared imaging;optical
radar;remote sensing by laser beam;soil;},
Abstract = {Mid-infrared laser reflectances of soils containing specific
minerals show diagnostic features in the 9-11 μm
wavelength range, resulting in their suitability for remote
sensing of terrestrial lithology. However, the presence of
actively growing vegetation can obscure these diagnostic
features, in some cases almost completely, so as to make
mineral identification virtually impossible. An experimental
study was carried out to determine the effects of growing
grass on the mid-infrared laser reflectance of bare soil in
order to determine the conditions under which the underlying
soil reflectance loses its diagnostic features, reflectance
ratios (indicative of diagnostic features) were investigated
as a function of grass-blade height for different grass
densities. It was found that, under specific soil
conditions, there appeared a grass-blade height value at
which the diagnostic ratios level off to a value of 1.0,
thereby masking the underlying soil features. These results
are expected to be useful for identifying optimal conditions
under which soil mineralogy can be identified under
overlying vegetation},
Key = {5385274}
}
@article{5718272,
Author = {Guenther, B.D. and Wood, M.V. and Khoo, I.C.},
Title = {Photorefractivity, phase conjugation and thermal wave mixing
effects in the visible and near IR spectral region for dye
and fullerene C60-doped nematic liquid
crystals},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {2854},
Pages = {151 - 9},
Address = {Denver, CO, USA},
Year = {1996},
Keywords = {electro-optical effects;fullerenes;liquid films;multiwave
mixing;nematic liquid crystals;nonlinear optics;optical
phase conjugation;organic compounds;photorefractive
effect;thermo-optical effects;},
Abstract = {The results of a recent study of a nonlinear electro-optical
effect in dye and fullerene C<sub>60</sub>-doped nematic
liquid crystal films are presented. In particular,
photo-induced conduction, self diffraction effects, and
optical phase conjugation in the films from near-UV to
near-IR wavelengths are explained},
Key = {5718272}
}
@article{97083766919,
Author = {Goyette, T.M. and Guo, W. and De Lucia and F.C. and Brown, E.R. and McIntosh, K.A. and Juvan, K. and Swartz, J.C. and Everitt, H.O. and Guenther, B.D.},
Title = {High resolution sub-millimeter spectroscopy using
mode-locked laser driven electro-optic antennas},
Journal = {Springer Series in Chemical Physics},
Number = {62},
Pages = {56 -},
Year = {1996},
Key = {97083766919}
}
@article{5260944,
Author = {Yin, S. and Guenther, B.D. and Yu, F.T.S.},
Title = {A tunable narrow-band filter using a photorefractive
fiber},
Journal = {Opt. Mem. Neural Netw. (USA)},
Volume = {5},
Number = {1},
Pages = {35 - 41},
Year = {1996},
Keywords = {diffraction gratings;electro-optical effects;optical design
techniques;optical fibre filters;photorefractive
materials;refractive index;tuning;},
Abstract = {In this paper, the design of a high signal-to-noise ratio
(SNR) tunable filter using a single crystal photorefractive
(PR) fiber is given. Because of the long physical structure,
Bragg gratings of a large number of periods can be
synthesized within the fiber. The wavelength selectivity of
10<sup>5</sup> order can be realized, which is suitable to
develop a narrow-band filter in the order of 0.01 nm. By
using a multiple grating structure in the fiber, a high SNR
of about 40 db is achievable in practice. Since the PR fiber
has a high electro-optic constant, the refractive index of
the fiber can be varied by an applied electric field, for
which the tuning speed can be in the ns range},
Key = {5260944}
}
@article{97013501422,
Author = {Khoo, I.C. and Wood, M. and Guenther, B.D.},
Title = {Nonlinear liquid crystal optical fiber arrays for
all-optical switching/limiting},
Journal = {Conference Proceedings - Lasers and Electro-Optics Society
Annual Meeting-LEOS},
Volume = {2},
Pages = {211 - 212},
Address = {Boston, MA, USA},
Year = {1996},
url = {http://dx.doi.org/10.1109/LEOS.1996.571627},
Keywords = {Nonlinear optics;Liquid crystals;Laser pulses;Imaging
systems;Optical waveguides;Optical sensors;Light
absorption;Doping (additives);Fullerenes;Optical instrument
lenses;Optical switches;Optical communication;},
Abstract = {An experiment was carried out to investigate the performance
of an optical limiting/protection device which features a
liquid crystal fiber array. The fiber core materials, which
was made up of isotropic liquid crystal mixture ILC, was
doped with a variety of dopant molecules, including an
absorbing liquid crystal LC-X and fullerene, to improve its
performance. For picosecond laser pulses, the output versus
input energy curves for these liquid crystal core materials
all exhibit limiting action at rather low threshold, with
the clamped output also very low. With optimized dopant
concentration and type, other liquid crystals with high
two-photon absorption coefficient, much lower threshold and
clamped transmission were obtained.},
Key = {97013501422}
}
@article{5744526,
Author = {Khoo, I.C. and Wood, M.V. and Guenther, B.D.},
Title = {Photorefractivity and holographic storage effect in
fullerene C60-doped nematic liquid
crystals},
Journal = {Liquid Crystals for Advanced Technologies.
Symposium},
Pages = {203 - 12},
Address = {San Francisco, CA, USA},
Year = {1996},
Keywords = {electro-optical effects;fullerenes;holographic storage;light
diffraction;nematic liquid crystals;nonlinear
optics;photoconductivity;photorefractive
effect;},
Abstract = {The results of a recent study of a nonlinear electro-optical
effect in fullerene C<sub>60</sub>-doped nematic liquid
crystal film are presented. In particular, photo-induced
conduction, self diffraction effect, and permanent
holographic formation in the films are explained},
Key = {5744526}
}
@article{5146287,
Author = {Swartz, J.C. and Guenther, B.D. and De Lucia and F.C. and Wei
Guo and Jones, C.R. and Kosai, H. and Dutta,
J.M.},
Title = {Nondestructive diagnostics for relativistic picosecond
bunched electron beams},
Journal = {Phys. Rev. E, Stat. Phys. Plasmas Fluids Relat. Interdiscip.
Top. (USA)},
Volume = {52},
Number = {5},
Pages = {5416 - 24},
Year = {1995},
url = {http://dx.doi.org/10.1103/PhysRevE.52.5416},
Keywords = {electron beams;particle beam diagnostics;rectangular
waveguides;relativistic electron beam tubes;},
Abstract = {The duration and form of relativistic picosecond electron
bunches in the Duke University Mark III free-electron laser
have been nondestructively measured by monitoring the
submillimeter radiation produced by the bunches as they pass
by or through a rectangular waveguide. Unlike other methods,
our technique produces negligible electron bunch
perturbation and allows real-time beam diagnostics to be
performed simultaneously with free-electron laser (FEL)
operation. We have measured 2.1-ps full width at half
maximum duration electron bunches, studied the effect of
electron gun and FEL modifications on bunch duration, and
observed electron bunch variations during bunch
trains},
Key = {5146287}
}
@article{5207879,
Author = {Shizhuo Yin and Guenther, B.D. and Yu, F.T.S.},
Title = {Narrow-band filter using multiple photorefractive
gratings},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {2529},
Pages = {196 - 203},
Address = {San Diego, CA, USA},
Year = {1995},
Keywords = {electro-optical effects;holographic gratings;optical fibre
filters;photorefractive effect;refractive
index;tuning;},
Abstract = {In this paper, we propose a novel high SNR tunable filter
using a photorefractive single crystal fiber with multiple
holographic gratings. Since the single crystal fiber which
is grown by the laser heated pedestal growth (LHPG)
technique can be more than 100 mm long, volume gratings with
extremely large number of period can be obtained in the
fiber. Thus, the wavelength selectivity of the grating can
be very high on the order of 10<sup>5</sup> so that one can
achieve very narrow band filter (<0.01 nm). To increase
the signal-to-noise ratio (SNR) of the filter, a method of
using multiple holographic gratings is proposed. The SNR can
be improved by more than 100 times as compared with a
conventional volume grating filter. Finally, the
electro-optic effect can be used to change the refractive
index of the crystal fiber, which in turn changes the
wavelength response of the stored volume grating. Since the
response time of the electro-optic effect is on the order of
1 ns, one can very rapidly tune the central-wavelength of
the filter},
Key = {5207879}
}
@article{95092876404,
Author = {Jones, C.R. and Kosai, H. and Dutta, J.M. and Peters, M.J. and Guo, W. and De Lucia and F.C. and Benson, S.V. and Madey,
J.M.J. and Swartz, J.C. and Guenther, B.D.},
Title = {Generation of picosecond pulses at millimeter
wavelengths},
Journal = {Applied Physics Letters},
Volume = {67},
Number = {10},
Pages = {1483 -},
Year = {1995},
url = {http://dx.doi.org/10.1063/1.114502},
Key = {95092876404}
}
@article{96012997722,
Author = {Goyette, Thomas M. and Guo, Wei and De Lucia and Frank C. and Swartz, John C. and Everitt, Henry O. and Guenther, B.D. and Brown, Elliott R.},
Title = {Femtosecond demodulation source for high-resolution
submillimeter spectroscopy},
Journal = {Applied Physics Letters},
Volume = {67},
Number = {25},
Pages = {3810 -},
Year = {1995},
url = {http://dx.doi.org/10.1063/1.115391},
Key = {96012997722}
}
@article{93121755607,
Author = {Guenther, B.D.},
Title = {Keynote address. Manufacturing the key to binary
optics},
Journal = {NASA Conference Publication},
Number = {3227},
Pages = {1 -},
Address = {Huntsville, AL, USA},
Year = {1993},
Key = {93121755607}
}
@article{93071637884,
Author = {Phillips, P.J. and von Ramm, O.T. and Swarz, J.C. and Guenther, B.D.},
Title = {Optical transducer for reception of ultrasonic
waves},
Journal = {Journal of the Acoustical Society of America},
Volume = {93},
Number = {2},
Pages = {1182 - 1191},
Year = {1993},
Abstract = {A new optical transducer for the detection of acoustic
pressure in the diagnostic ultrasound frequency range is
described. This transducer is based on the modulation of an
evanescent light field by the incident acoustic energy.
Theoretical design considerations are presented for the
purpose of developing the most sensitive transducer. Based
on these considerations an experimental transducer was
constructed. Although less sensitive than predicted this
device was capable of transducing ultrasonic pulses with a
1.0-MHz center frequency at diagnostic ultrasound amplitude
levels. The techniques developed here are applicable for
two-dimensional transduction and may prove a viable
alternative to piezoelectric array transducers.},
Key = {93071637884}
}
@article{92060518040,
Author = {Guenther, B. D. and VanderLugt, A.},
Title = {Interference and Fresnel diffraction},
Journal = {IEEE Transactions on Education},
Volume = {35},
Number = {2},
Pages = {126 - 132},
Year = {1992},
url = {http://dx.doi.org/10.1109/13.135577},
Keywords = {Mathematical Transformations - Fourier Transforms;Light -
Diffraction;Holography;Microscopic Examination;},
Abstract = {It is shown that a surprising number of traditional topics,
such as the Rayleigh resolution criterion, spatial
filtering, bandlimited signals, the sampling theorem, phase
contrast microscopy, and white light holography, can be
explained using simple interference theory. These basic
results are then easily extended to the N-source case to
introduce diffraction theory, and facilitate the teaching of
the elements of modern optics to junior and senior-level
students.},
Key = {92060518040}
}
@booklet{Caulfield90,
Author = {H. J. Caulfield and J. W. Goodman and R. D. Guenther and B.
M. Hendrickson and J. A. Neff and W. T. Rhodes and T. M.
Turpin and A. Yang},
Title = {Goals for optical signal-processing and optical computing in
the 1990s},
Journal = {Laser Focus World},
Volume = {26},
Number = {1},
Pages = {143 -- 146},
Year = {1990},
Month = {January},
Key = {Caulfield90}
}
@article{3625762,
Author = {Lam, J.F. and Guenther, B.D. and Skatrud,
D.D.},
Title = {Theory of millimeter wave nonlinearities in semiconductor
superlattices},
Journal = {Appl. Phys. Lett. (USA)},
Volume = {56},
Number = {8},
Pages = {773 - 5},
Year = {1990},
url = {http://dx.doi.org/10.1063/1.102709},
Keywords = {harmonic generation;self-induced transparency;semiconductor
superlattices;},
Abstract = {A study of the impact of semiconductor superlattices on
millimeter wave nonlinearities is reported.
χ<sup>(3)</sup> as large as 10<sup>-2</sup> esu can be
achieved by using 250 GHz radiation. Self-induced
transparency is also predicted, and its competition with the
third-harmonic generation process is quantified},
Key = {3625762}
}
@article{3614029,
Author = {Swartz, J.C. and De Lucia and F.C. and Guenther,
B.D.},
Title = {Application of frequency-domain techniques for tuning pulsed
lasers},
Journal = {OSA Proceedings on Picosecond Electronics and
Optoelectronics Volume 4. Proceedings of the OSA Topical
Meeting},
Pages = {57 - 60},
Address = {Salt Lake City, UT, USA},
Year = {1989},
Keywords = {dye lasers;laser mode locking;laser tuning;},
Abstract = {Demonstrates an alternative technique to the use of an
autocorrelator for accurately tuning pulsed lasers. This
technique is based upon the use of frequency domain
information in place of the time domain information to
obtain the optimum modelocked condition},
Key = {3614029}
}
@article{3604172,
Author = {Stone, T. and George, N. and Guenther, B.D.},
Title = {Index variation and scattering in a holographic
medium},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {1136},
Pages = {35 - 44},
Address = {Paris, France},
Year = {1989},
Keywords = {holographic gratings;holographic optical elements;light
scattering;refractive index measurement;spectrophotometry;},
Abstract = {In the fabrication of holographic optical elements, it is
important to have careful characterization of the recording
medium. Hence, the authors have made measurements of the
increment in the index of refraction vs. exposure for
DMP-128 manufactured by Polaroid corporation. The results of
measurements are presented for a series of holographic
diffraction gratings. A novel spectrometer technique that
provides a simultaneous measure of both thickness and
refractive index is described. Data illustrating its use are
presented for the holographic photopolymer. The feasibility
of filling voids in the processed photopolymer for device
applications was demonstrated by construction of a
distributed feedback dye laser in a DMP-128 grating. At high
spatial frequencies, diffraction efficiency is used to
estimate refractive index variations. As an initial finding,
the authors report a rather large modulation in the index of
refraction of 0.2 at 1000 cycles/mm},
Key = {3604172}
}
@article{3392225,
Author = {Guenther, B.D.},
Title = {Gradients and their applications},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {935},
Pages = {95 - 104},
Address = {Orlando, FL, USA},
Year = {1988},
Keywords = {gradient index optics;military equipment;},
Abstract = {The use of gradient properties in a wide range of physical
processes are discussed with emphasis on optical
applications of interest to the military},
Key = {3392225}
}
@article{3268777,
Author = {Hay, W.C. and Guenther, B.D.},
Title = {Characterization of Polaroid's DMP-128 holographic recording
photopolymer},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {883},
Pages = {102 - 5},
Address = {Los Angeles, CA, USA},
Year = {1988},
Keywords = {holography;photographic emulsions;polymers;},
Abstract = {The fundamental holographic properties of Polaroid's DMP-128
have been measured. Diffraction efficiencies over 90% have
been obtained with an index modulation of 0.033. It was
found that the diffraction efficiency could be reduced from
90% to less than 10% by the use of an index matching fluid.
When the index matching fluid was allowed to evaporate, the
diffraction efficiency returned to its original value. This
observation suggests that the index modulation produced in
the photopolymer is due to tiny cracks or voids formed in
the polymer},
Key = {3268777}
}
@article{3229262,
Author = {Anderson, G.W. and Guenther, B.D. and Hynecek, J.A. and Keyes, R.J. and VanderLugt, A.},
Title = {Role of photodetectors in optical signal
processing},
Journal = {Appl. Opt. (USA)},
Volume = {27},
Number = {14},
Pages = {2871 - 86},
Year = {1988},
Keywords = {optical information processing;photodetectors;},
Abstract = {Optical signal processing applications place demands on
photodetector arrays beyond those encountered in image
sensing applications. The authors review the basic
requirements and show that increased dynamic range and
nonlinear decision operations that lead to reduced output
data rates are the key improvements needed for both 1- and
2-D arrays. Arrays of high-speed photodetector elements with
integrated postdetection circuitry are also needed. Although
they suggest some possible methods for achieving these
goals, their main objective is to simulate the photodetector
community to design and fabricate more useful
devices},
Key = {3229262}
}
@article{2587580,
Author = {De Lucia and F.C. and Guenther, B.D. and Anderson,
T.},
Title = {Microwave generation from picosecond demodulation
sources},
Journal = {Appl. Phys. Lett. (USA)},
Volume = {47},
Number = {8},
Pages = {894 - 6},
Year = {1985},
url = {http://dx.doi.org/10.1063/1.95968},
Keywords = {demodulation;microwave generation;microwave
tubes;},
Abstract = {A mode-locked picosecond laser has been used to prebunch
electron beams at a photocathode. These electrons are
subsequently accelerated through coupling structures and
microwaves radiated. The relation between the microwave
output and the properties of the picosecond pulse train and
the electron beam output coupling process are reported and
related to theory. Among the important attributes of these
devices are their ability to generate almost arbitrary
microwave waveforms, to operate in the 100-200 kV region
with very simple power supplies and excellent spectral
purity, and to generate substantially more microwave power
than contained in the optical drive},
Key = {2587580}
}
@article{83030037371,
Author = {Mink, J. W. and Guenther, B. D.},
Title = {PLEA FOR SYNERGISM.},
Journal = {Proceedings of SPIE - The International Society for Optical
Engineering},
Volume = {317},
Pages = {10 - 14},
Address = {Huntsville, AL, USA},
Year = {1982},
Keywords = {WAVEGUIDES;},
Key = {83030037371}
}
@article{1951750,
Author = {Guenther, B.D. and Buser, R.G.},
Title = {Tunable lasers-an overview},
Journal = {IEEE J. Quantum Electron. (USA)},
Volume = {QE-18},
Number = {8},
Pages = {1179 - 84},
Year = {1982},
Keywords = {laser tuning;reviews;},
Key = {1951750}
}
@article{1999923,
Author = {Mink, J.W. and Guenther, B.D.},
Title = {Plea for synergism [MM/subMM wave IC]},
Journal = {Proc. SPIE - Int. Soc. Opt. Eng. (USA)},
Volume = {317},
Pages = {10 - 14},
Address = {Huntsville, AL, USA},
Year = {1981},
Keywords = {dielectric waveguides;economics;integrated circuit
technology;integrated optics;microwave integrated
circuits;military equipment;},
Abstract = {Because of the proposed number of units expected to utilize
millimeter/submillimeter waves in the military (on the scale
of 50000 items/system) it is vital to develop the technology
base such that it will economically support the manufacture
of millimeter wave systems. The technology which holds the
greatest potential to meet the military requirements above
100 GHz will probably be based upon dielectric waveguides.
That technology must be developed so that low cost,
reproducible millimeter/submillimeter wave integrated
circuits will be available},
Key = {1999923}
}
@article{80060002737,
Author = {Smith, J. Lynn and Guenther, B. D. and Christensen, Charles
R.},
Title = {REAL-TIME OPTICAL PROCESSING USING THE LIQUID CRYSTAL LIGHT
VALVE.},
Journal = {Journal of Applied Photographic Engineering},
Volume = {5},
Number = {4},
Pages = {236 - 243},
Year = {1979},
Keywords = {CRYSTALS, LIQUID - Applications;},
Abstract = {Implementation of the liquid crystal light valve in several
coherent optical processing schemes is demonstrated.
Experiments were designed to extend conventional techniques
to real-time and explore new applications concepts. These
are (1) real-time holography for adaptive optics, (2)
Doppler imaging using the light valve for coherent detection
with a frequency coded reference beam, (3) object
recognition and tracking via cross-correlation with Vander
Lugt filters, (4) time-average speckle imagery for
discrimination of slowly moving objects, and finally (5)
range-slice imagery and range-Doppler simulation.},
Key = {80060002737}
}
@article{80060007211,
Author = {Guenther, B. D. and Christensen, C. R. and Upatnieks,
Juris},
Title = {COHERENT OPTICAL PROCESSING: ANOTHER APPROACH.},
Journal = {IEEE Journal of Quantum Electronics},
Volume = {QE-15},
Number = {12},
Pages = {1348 - 1362},
Year = {1979},
url = {http://dx.doi.org/10.1109/JQE.1979.1069953},
Keywords = {OPTICAL DATA PROCESSING;},
Abstract = {Demonstration of real-time coherent optical correlation for
both vehicle tracking and identification has been
demonstrated. A reference filter has been constructed that
can recognize a vehicle from all orientations. A design of a
coherent optical processor is presented using laser diode
light sources and having a package size of 50
cm**3.},
Key = {80060007211}
}
@article{1238717,
Author = {Guenther, B.D. and Christensen, C.R. and Anil
Jain},
Title = {Digital processing of speckle images},
Journal = {Proceedings of the 1978 Conference on Pattern Recognition
and Image Processing},
Pages = {85 - 90},
Address = {Chicago, IL, USA},
Year = {1978},
Keywords = {digital filters;digital simulation;picture
processing;probability;speckle;},
Abstract = {A digital model of an image with speckel noise is
constructed and verified by comparison to optically
generated images with speckle noise. The model is then used
to obtain detection probabilities and to evaluate several
digital filtering techniques},
Key = {1238717}
}
@article{1208625,
Author = {Gamble, W.L. and Guenther, B.D. and Hartman, R.L. and Osmundsen, J.F. and Kruse, P.W.},
Title = {MIRADCOM far infrared imaging radar program},
Journal = {Proceedings of the Society of Photo-Optical Instrumentation
Engineers, vol.105. Far Infared/Submillimeter
Wave},
Pages = {102 - 11},
Address = {Reston, VA, USA},
Year = {1977},
Keywords = {infrared imaging;radar;radar measurement;radar
systems;},
Abstract = {The US Army Missile Research and Development Command has set
up an instrumented propagation range at Redstone Arsenal,
Alabama, for the purpose of systematically identifying and
exploring the effects of the atmosphere and materials
reflectance (natural and cultural) on high angular
resolution radar systems. The emphasis will be on
propagation and reflectance measurements in the water vapor
absorption windows around 730, 870 and 1200 micrometers. The
techniques, apparatus, and goals are described},
Key = {1208625}
}
@article{1136373,
Author = {Guenther, B.D. and George, N. and Christensen, C.R. and Bennett, J.S.},
Title = {Speckle noise and object contrast},
Journal = {Photographic Science and Engineering},
Volume = {21},
Number = {4},
Pages = {192 - 7},
Year = {1977},
Keywords = {optical images;optical information processing;optical
systems;photography;speckle;},
Abstract = {A technique is demonstrated for evaluation of detection
thresholds as a function of object size and contrast in
coherent imaging systems. Several experiments are used to
illustrate the application of this technique: (a) A study of
three different methods of speckle smoothing; (b) a
demonstration that speckle decorrelates with input
polarization; and (c) a demonstration that fully-developed
speckle leads to an image degradation independent of light
level over a very wide range of light levels. Photographic
data are provided to illustrate the effectiveness of this
technique},
Key = {1136373}
}
@article{1034989,
Author = {George, N. and Christensen, C.R. and Bennett, J.S. and Guenther, B.D.},
Title = {Speckle noise in displays},
Journal = {J. Opt. Soc. Am. (USA)},
Volume = {66},
Number = {11},
Pages = {1282 - 90},
Year = {1976},
Keywords = {display instrumentation;noise;optical radar;radar
displays;speckle;},
Abstract = {An expression is derived for the minimum detectable contrast
level for an object in presence of speckle noise. The
threshold limits of the discernible contrast with variation
of the statistical parameters of the illumination are
studied. Minimum detectable contrast is measured for two
classes of speckle noise i) the coherent superposition of a
plane wave and a diffuse (fully developed speckle) beam, the
threshold being established as a function of beam ratio, and
ii) the intensity superposition of N-independent fully
developed speckle patterns. The effects of smoothing by area
and by multiple looks are considered. Experimental results
are in good agreement with theory},
Key = {1034989}
}
@article{1053062,
Author = {Gamble, W.L. and Guenther, B.D.},
Title = {Submillimeter laser wave propagation},
Journal = {2nd International Conference and Winter School on
Submillimeter Waves and their Applications},
Pages = {231 - 2},
Address = {San Juan, Puerto Rico},
Year = {1976},
Keywords = {atmospheric light propagation;atmospheric measuring
apparatus;laser beams;optical radar;optical resolving
power;},
Abstract = {Describes primarily the apparatus, techniques, goals and
some preliminary results of the US Army Missile Command
submillimeter wave program. The basic question is that of
the range and effective angular resolution of scanned
submillimeter radar systems in particular during
meteorological conditions of severely limited visibility.
The most critical propagation issues are water vapour
absorption, extinction due to aerosols, and beam degradation
effects, if any, due to atmospheric turbulence},
Key = {1053062}
}
@article{76030005260,
Author = {Aleksoff, C. C. and Guenther, B. D.},
Title = {CROSS-CORRELATION DISCRIMINATION FOR OPTICAL CAVITY
MODES.},
Journal = {Applied Optics},
Volume = {15},
Number = {1},
Pages = {206 - 217},
Year = {1976},
Keywords = {RESONATORS, CAVITY;},
Abstract = {Matched spatial filters were constructed for various modes
of a spherical Fabry-Perot interferometer (FPSI). The cross
correlation between many of these modes was obtained
experimentally as well as theoretically. The orthogonality
between various modes was demonstrated and used in order to
discriminate against all orthogonal modes. A discrimination
function that predicts the performance of the
matched-filtering process is defined and analytically
evaluated for rectangular and cylindrical Gaussian modes. It
is shown that arbitrary discrimination strength can be
obtained at the sacrifice of output signal strength. It was
experimentally demonstrated that a scanning FPSI used in
conjunction with only one zero-order-mode filter could be
used over nearly its entire domain of stable cavity spacings
and still maintain a full (c/2L) free spectral
range.},
Key = {76030005260}
}
@article{921436,
Author = {Schlie, L.A. and Guenther, B.D. and Rathge,
R.D.},
Title = {Positive gain measurements on the 3350-Å continuum
band of Hg2},
Journal = {Appl. Phys. Lett. (USA)},
Volume = {28},
Number = {7},
Pages = {393 - 6},
Year = {1976},
url = {http://dx.doi.org/10.1063/1.88772},
Keywords = {gas lasers;mercury (metal);},
Abstract = {Positive gain measurements are reported on the flanks of the
3350 Å continuum band in mercury vapour at 3.72 atm.
pressure, pumped by a 600 J, 1.5 MeV, 20 nsec. pulsed
electron beam. The stimulated emission cross section at
three probe wavelengths is approximately 10<sup>-18</sup>
cm<sup>2</sup>, exceeding photoabsorption by any process in
Hg/Hg<sub>2</sub>. The laser gain signals are reported to be
further enhanced in vapours heated above the saturation
temperature, indicating that the upper level is populated by
a temperature dependent internal energy reservoir},
Key = {921436}
}
@article{908389,
Author = {Aleksoff, C.C. and Guenther, B.D.},
Title = {Cross-correlation discrimination for optical cavity
modes},
Journal = {Applied Optics},
Volume = {15},
Number = {1},
Pages = {206 - 17},
Year = {1976},
Keywords = {correlators;holography;laser cavity resonators;light
interferometers;optical filters;optical information
processing;},
Abstract = {A hologram can act as a matched spatial filter, i.e. as a
correlator of two wavefronts. Correlation between the
wavefront stored in the hologram and the incident wavefront
is displayed as a two dimensional spatial distribution in
the correlation plane. If a matched filter is produced for
one of the modes of an open optical resonator, it can
discriminate against all the other orthogonal modes. Theory
and experimental results for matched spatial filters for the
modes of a spherical Fabry-Perot interferometer (SFP1) are
described. Effects of matched filtering of scanning SFP1 are
shown. Experimental cross-correlation and autocorrelation
functions for circularly symmetric and for rectangular modes
are also shown. Fourier transform, convolution, and
correlation characteristics of modes are
tabulated},
Key = {908389}
}
@article{830853,
Author = {Schlie, L.A. and Guenther, B.D. and Drummond,
D.L.},
Title = {Origin of the 4400 Å and 5300 Å bands of
Hg2},
Journal = {Chem. Phys. Lett. (Netherlands)},
Volume = {34},
Number = {2},
Pages = {258 - 60},
Year = {1975},
url = {http://dx.doi.org/10.1016/0009-2614(75)85267-5},
Keywords = {fluorescence;mercury (metal);molecular excited
states;molecular vibration;},
Abstract = {Previously reported spectral data from e-beam excited Hg
vapor contains bands at 4400 Å and 5300 Å
whereas other excitation methods produce a band centered at
5100 Å. The probable origin of the anomalous e-beam
produced spectrum is shown to be the vibrational
non-equilibrium of the Hg<sub>2</sub> (A<sup>3</sup>0<sub>u</sub><sup>-</sup>)
state. Time resolved spectra are presented},
Key = {830853}
}
@article{475254,
Author = {Bendall, C.R. and Guenther, B.D. and Hartman,
R.L.},
Title = {Thick amplitude holograms: effect of nonlinear
recording},
Journal = {Appl. Opt. (USA)},
Volume = {11},
Number = {12},
Pages = {2992 - 3},
Year = {1972},
Keywords = {holography;},
Abstract = {A modification is made of the coupled wave theory to
describe the observed behaviour of a nonlinearly recorded
hologram},
Key = {475254}
}
@article{416298,
Author = {Bendall, C.R. and Guenther, B.D.},
Title = {Technique for obtaining a photomicrograph of a cross section
of photographic emulsion},
Journal = {Appl. Opt. (USA)},
Volume = {11},
Number = {7},
Pages = {1653 -},
Year = {1972},
Keywords = {photographic materials;},
Key = {416298}
}
@article{310588,
Author = {Richards, P.M. and Christensen, C.R. and Guenther, B.D. and Daniel, A.C.},
Title = {Nuclear-magnetic-resonance echo enhancement in an
antiferromagnet},
Journal = {Phys. Rev. B, Solid State (USA)},
Volume = {4},
Number = {7},
Pages = {2216 - 24},
Year = {1971},
url = {http://dx.doi.org/10.1103/PhysRevB.4.2216},
Keywords = {antiferromagnetic properties of substances;manganese
compounds;nuclear magnetic resonance;},
Abstract = {The observation of an anomalous enhancement of a two-pulse
nuclear spin echo in antiferromagnetic MnO by a prepulse of
variable width, amplitude, and delay time is described. A
theory explaining this observation by adding frequency
pulling to the Block equations is discussed. In this model
the frequency pulling parameter is assumed to be
inhomogeneous throughout the sample, consistent with current
ideas of NMR line broadening in materials with strong
pulling. Long free-induction decays observed following wide
pulses are also explained},
Key = {310588}
}
@article{262345,
Author = {Guenther, B.D. and Christensen, C.R. and Jensen, R.A. and Daniel, A.C.},
Title = {Capacitively and inductively foreshortened cavities for
magnetic resonance spectroscopy},
Journal = {Rev. Sci. Instrum. (USA)},
Volume = {42},
Number = {4},
Pages = {431 - 4},
Year = {1971},
Keywords = {cavity resonators;magnetic resonance spectrometers;nuclear
magnetic resonance;resonators;},
Abstract = {Two types of cylindrical reentrant cavities are described
for magnetic resonance and ultrasonic applications in the
0.1-1.0 GHz frequency region. The physical size of these
cavities is reduced by introducing large capacitive and
inductive elements into the cavity. Tuning, rf coupling, and
temperature control techniques are described for operation
at low temperatures},
Key = {262345}
}
@article{224233,
Author = {Guenther, B.D. and Christensen, C.R. and Daniel, A.C. and Richards, P.M.},
Title = {NMR and AFMR modes in antiferromagnetic MnO},
Journal = {Phys. Lett. A (Netherlands)},
Volume = {33a},
Number = {6},
Pages = {355 - 7},
Year = {1970},
Keywords = {antiferromagnetic resonance;manganese compounds;nuclear
magnetic resonance;},
Abstract = {NMR modes in antiferromagnetic MnO are interpreted in terms
of a two sublattice model. Observation of AFMR mode at 27.6
GHz correlates with this interpretation},
Key = {224233}
}
@article{285315,
Author = {Daniel, A.C. and Guenther, B.D. and Christensen,
C.R.},
Title = {Echo amplification in magnetic materials with application to
pulse compression radar},
Volume = {unnumbered},
Pages = {15 -},
Year = {1970},
Keywords = {ferrite applications;ferrites;garnets;nuclear magnetic
resonance;radar receivers;},
Abstract = {Echo phenomena in several materials have been reviewed for
the purpose of considering the recently proposed amplified
spin echo as a chirp radar receiver. The technique is
believed to exhibit considerable merit in that a number of
desirable characteristics have been combined in a unique
manner. If properly realized, a portion of the processing of
the radar signal could be accomplished at the antenna feed
element. However, the available materials still limit the
practical usefulness of this device as compared to more
conventional techniques},
Key = {285315}
}
@article{149180,
Author = {Christensen, C.R. and Guenther, B.D. and Daniel,
A.C.},
Title = {NMR observation of domain structure in antiferromagnetic
MnO},
Journal = {J. Appl. Phys. (USA)},
Volume = {41},
Number = {3},
Pages = {1113 -},
Address = {Philadelphia, PA, USA},
Year = {1970},
Keywords = {antiferromagnetic properties of substances;magnetic
domains;manganese compounds;nuclear magnetic
resonance;nuclei with 39⩽A⩽58;nuclei with
59⩽A⩽89;},
Abstract = {Abstract only given, substantially as follows. The frequency
pulled <sup>55</sup>Mn nuclear resonance in MnO at 4.2°K
was observed as a function of the angle of rotation of the
applied field <i>H</i><sub>0</sub> about a [111] direction.
The resonance spectrum was found to consist of one branch,
independent of the position of <i>H</i><sub>0</sub>, and
three other branches which coincide in frequency with the
angle independent branch at 60° periods and move to
lower frequencies at other positions of <i>H</i><sub>0</sub>.
These branches correspond to resonance in antiferromagnetic
<i>T</i>-domains ordered along the four equivalent [111]
directions. The components of <i>H</i><sub>0</sub>
perpendicular to each of the [111] directions were
calculated as a function of magnet angle},
Key = {149180}
}
@article{107233,
Author = {Guenther, B.D. and Christensen, C.R. and Daniel,
A.C.},
Title = {55Mn nuclear magnetic resonance in
antiferromagnetic MnO},
Journal = {Phys. Lett. A (Netherlands)},
Volume = {30a},
Number = {7},
Pages = {391 - 2},
Year = {1969},
Keywords = {manganese compounds;nuclear magnetic resonance;nuclei with
39⩽A⩽58;nuclei with 59⩽A⩽89;},
Abstract = {One of the two <sup>55</sup>Mn nuclear magnetic resonances
in MnO at 4.2°K is found to be only slightly dependent
upon the magnet field, whereas the second is relatively
strongly pulled with decreasing field and unobservable below
12 kOe},
Key = {107233}
}