Variance and spectra of fluorescence-intensity fluctuations from two-level atoms in a phase-diffusing field

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.42.6690· OSTI ID:6398592

Anderson, M H; Jones, R D; Cooper, J; Smith, S J ^[1]; Elliott, D S ^[2]; Ritsch, H; Zoller, P ^[3]

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1. Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, CO (USA) National Institute of Standards and Technology, Boulder, CO (USA)
2. School of Electrical Engineering, Purdue University, West Lafayette, IN (USA)
3. Institute for Theoretical Physics, University of Innsbruck, Innsbruck (Austria)

We have measured the variance in fluorescence intensity and the spectrum of those fluctuations for two-level atoms in a phase-diffusing laser field. We compare our results with recent theoretical predictions that have been extended to include the effects of Doppler broadening and spatial variation of the laser intensity. Our study includes the effects of laser power, bandwidth, and shape (Lorentzian and non-Lorentzian) of the laser spectrum. At lower laser intensities, our measured variances versus detuning are in quantitative agreement with the theoretical predictions. At intensities above saturation, the variance is sensitive to inhomogeneities in the distribution of laser intensity in the interaction region, and only qualitative agreement is achieved. Asymmetries in the variance versus detuning resulting from correlated amplitude and phase noise have been observed. Spectra of the phase-noise-induced fluorescence-intensity fluctuations are shown to contain contributions from transients excited by the phase noise and are more sensitive to artifacts in the noise modulation process than the intensity spectrum of the laser field itself.

• OSTI ID: 6398592
• Journal Information: Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 42:11; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
FLUORESCENCE
FLUX DENSITY
LASER RADIATION
LUMINESCENCE
PARAMETRIC ANALYSIS
RADIATIONS
VARIATIONS