Publications [#248536] of John E. Thomas

Papers Published

1. Zhao, HZ; Lu, ZH; Bacon, AM; Wang, LJ; Thomas, JE, Precision Measurement of Phase-Dependent Resonance Fluorescence Spectra, Phys. Rev. A, vol. 57 no. 2 (1998), pp. 1427-1447, American Physical Society (APS), ISSN 1050-2947 [Gateway.cgi], [doi]
   (last updated on 2026/01/13)

   Abstract:
   We measure phase-dependent fluorescence spectra for an elementary system: long-lived coherently driven two-level atoms in an atomic beam. Phase-dependent fluorescence spectra measure quadrature noise in the atomic radiation field. These noise spectra are obtained using a homodyne detection scheme that suppresses excess noise by subtracting signals from two identically prepared atomic samples. Noise spectra are obtained for atomic radiation which is in phase [Formula Presented] and out of phase [Formula Presented] with a resonant driving field, as well as [Formula Presented] out of phase with an off-resonant driving field. The measured phase-dependent fluorescence spectra are much richer than ordinary fluorescence spectra, and exhibit many novel features. Particularly interesting are phase-dependent noise spectra for off-resonant excitation. These strikingly exhibit direct manifestations of time ordering, which appear as large differences between the measured [Formula Presented] and [Formula Presented] quadrature noise spectra. The measured noise spectra are in excellent agreement in magnitude and shape with the results of a quantum treatment using no free parameters. © 1998 The American Physical Society.