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Soviet Journal of Quantum Electronics

Intra-Doppler resonances of the cesium D2line in a selective specular reflection profile

Vladimir A. Sautenkov, Vladimir L Velichansky, Alexander S. Zibrov, V N Luk'yanov, V V Nikitin, D A Tyurikov

Published Sep 30, 1981• 11 citations
Publisher

Abstract

An investigation was made of selective specular reflection from 133Cs vapor in the range of atomic concentrations between 4×1013 and 2×1015 cm−3 where collisional broadening of the D2 line is less than the Doppler broadening. The radiation source was an injection laser. Intra-Doppler resonances corresponding to the hyperfine structure of the excited state were recorded in the selective reflection profile. Shifts of the reflection resonances relative to the luminescence resonances of the atomic beam did not exceed 50 MHz. The possiblity of using selective reflection for linear spectroscopy of atomic lines without Doppler broadening is discussed.

DOI
10.1070/qe1981v011n09abeh008205

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Physical Review A•Jun 1, 1992•36 citations
An investigation was made of selective specular reflection from 133Cs vapor in the range of atomic concentrations between 4×1013 and 2×1015 cm−3 where collisional broadening of the D2 line is less than the Doppler broadening. The radiation source was an injection laser. Intra-Doppler resonances corresponding to the hyperfine structure of the excited state were recorded in the selective reflection profile. Shifts of the reflection resonances relative to the luminescence resonances of the atomic beam did not exceed 50 MHz. The possiblity of using selective reflection for linear spectroscopy of atomic lines without Doppler broadening is discussed.
Pulsed stimulated emission near the D2 line of 133Cs (852.1 nm) was obtained from a semiconductor laser with an external selective element utilizing specular reflection from a cesium vapor cell. The power and spectral width of the stimulated emission at a vapor pressure of 2 Torr were 1 mW and 5×10−3 nm, respectively. Investigations were made of the spectral and temporal characteristics of the laser radiation at different cesium vapor pressures. An analysis was made of the conditions needed to enhance substantially the average stimulated emission power. The possibility of using a laser with an external selectively reflecting cell for optical pumping of alkali metal vapors is discussed. The resonance absorption lines of rubidium and potassium were recorded using a pulsed injection laser.
Abstract Coherent narrow resonances in a homogeneously broadened contour of selective reflection from the interface between a cell window and high-density atomic rubidium vapor, where the dipole broadening greatly exceeds the Doppler width of the unresolved components of rubidium D2 line, are discussed. The formation of coherent resonances is caused by the coherent scattering of probe and pump optical fields from the oscillations of populations of the ground and excited states of atoms at the beat frequency. The width of each resonance depends on the population difference decay rate. Within a simple model conditions are found for observing resonances with a Lorentzian spectral profile. The experimentally recorded coherent resonances are described by a Lorentz function with fitting parameters in the form of amplitude, width, and spectral baseline. In the limit of zero optical saturation the measured half-width of a coherent resonance (HWHM) γres/2π is about 52 MHz, which greatly exceeds the radiative decay rate of the rubidium excited state 5P3/2.
We report an observation of \ensuremath{\Delta}m=2 ground-state coherences in selective-reflection spectra at a glass--metal-vapor interface. The coherence was created by a linearly polarized laser beam tuned to a sub-Doppler resonance in the selective-reflection spectrum of the cesium D2{\mathit{D}}_{2}D2​ line and detected through the magnetorotation of the plane of polarization of the reflected beam. The coherence effect appears as a dispersive shaped resonance of subnatural width. The dependence of the width on the intensity of the optical field shows a saturation behavior. For vanishing light intensity and cesium vapor pressure the linewidth is limited by transverse time-of-flight broadening, whereas its pressure dependence indicates an additional contribution from the finite longitudinal interaction time.