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Soviet Journal of Quantum Electronics

Profile of the cesium D2line observed using a semiconductor laser

N.M. Ievskaya, L. S. Kornienko, A. L. Kotkin, V I Malakhova, R. M. Umarkhodzhaev, Sergei D. Yakubovich

Published Feb 28, 1982• 2 citations
Publisher

Abstract

An investigation was made of the profile of the hyperfine component of the cesium line observed using a cw semiconductor laser. It was found that the profiles of the absorption and luminescence signals, their widths, amplitudes, and the positions of the maximum depend strongly on the relaxation time of the active medium, laser radiation intensity, and rate and direction of passage of the frequency through resonance.

DOI
10.1070/qe1982v012n02abeh005555

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An investigation was made of the profile of the hyperfine component of the cesium line observed using a cw semiconductor laser. It was found that the profiles of the absorption and luminescence signals, their widths, amplitudes, and the positions of the maximum depend strongly on the relaxation time of the active medium, laser radiation intensity, and rate and direction of passage of the frequency through resonance.
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The absorption and fluorescence spectra of a submicron Cs vapour layer under resonant excitation on the D2 line are measured. Sub-Doppler features centered at the resonance frequency of the hyperfine (hf) transitions have been observed. Substantial changes in the amplitude and width of the sub-Doppler resonances for individual hf transitions were recorded in dependence on the intensity of the incident laser radiation. In the fluorescence spectra narrow dips due to the effects of saturation have been observed. We also report about the observation of coherence resonances in Hanle configuration obtained at cell thickness of the order of the wavelength of the laser light.
The intensity dependent absorption was measured on the line (6 transition) in atomic cesium. The magnetic field applied to the vapour and the spatial cross section of the laser beam were controlled and varied during data collection. A three-level rate equation model is presented in an attempt to explain the results. We show that this well known approach does not sucessfully model the data obtained in the absence of a magnetic field. Hence, a more complex and complete model that explicitly includes all of the hyperfine magnetic sublevels (a multilevel model) is presented. This approach accurately models all of the data collected. The good agreement betweeen this model and the data allows the determination of the transit relaxation rate (due to atomic time of flight through the laser beam), , where is the two-dimensional root-mean-squared speed of the atom and D is the FWHM of the Gaussian laser beam spatial profile.