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Optics Communications

Intensity and concentration dependence of Doppler-free resonance in selective reflection

A. M. Akulshin, A.A. Celikov, Vladimir A. Sautenkov, T.A. Vartanian, Vladimir L Velichansky

Published Aug 1, 1991• 22 citations
Publisher
DOI
10.1016/0030-4018(91)90045-f

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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.
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.
The dipole–dipole broadening of the spectrum of the selective reflection of intense resonance light from the interface between a transparent dielectric and a gas of the natural mixture of Rb isotopes has been studied experimentally. The case of a high gas density where the Doppler broadening can be neglected has been investigated. It has been shown that dipole–dipole broadening is reduced with increasing the number density of excited atoms. When the laser beam intensity is much higher than the saturation intensity of a resonance transition, a significant broadening due to the very high laser beam intensity has not been observed in the reflection spectrum from the transparent dielectric/gas interface. The observed intensity dependence of the spectral width has been explained by the quenching collisions of the excited atoms with the interface.