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AIP conference proceedings

Self-induced polarization effects in gases

С. А. Бахрамов, A. T. Berdikulov, А. М. Коххаров, Pulat K. Khabibullaev, Vladimir Tikhonenko

Published Jan 1, 1989• 1 citation
Publisher

Abstract

The one‐photon effect of the resonance self‐induced optical activity (SIOA) in a atomic rubidium vapour has been experimentally investigated for the first time. Data on optical polarization rotation are presented and interpreted in terms of the resonance behavior of the third order susceptibility and finite elliptical polarization of real lasers. The limitations introduced by SIOA on the sensitivity of polarization spectroscopy is also discussed.

DOI
10.1063/1.38640

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The one‐photon effect of the resonance self‐induced optical activity (SIOA) in a atomic rubidium vapour has been experimentally investigated for the first time. Data on optical polarization rotation are presented and interpreted in terms of the resonance behavior of the third order susceptibility and finite elliptical polarization of real lasers. The limitations introduced by SIOA on the sensitivity of polarization spectroscopy is also discussed.
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A study was made of the influence of autoionization-like resonances in the continuum, induced by strong optical radiation, on the nonlinear susceptibilities governing third harmonic generation and the optical activity of sodium vapor. It was demonstrated experimentally for the first time that it should be possible to study high-lying states of atoms and molecules by the method of nonlinear polarization spectroscopy of the fifth-order optical nonlinearity. The experimental results were compared with the theory. An analysis was made of the feasibility of using this effect for spectroscopy of the states in the continuum and for generation of short-wavelength radiation in gaseous media.
We present an experimental and theoretical study of self-rotation of optical polarization in a rubidium vapor.The atomic vapor is placed in a magnetic shielding cavity to suppress the Faraday rotation effect.In our experiment, Doppler-free spectroscopy configuration is used, and F = 2 → F = 3 transition of 87 Rb D2 line is chosen.We observe self-rotation of optical polarization effect at different pump light ellipticities.A theoretical analysis is then provided based on the experimental conditions.Theoretical simulation and experimental results are in good agreement.
Polarization effects in gases are investigated by two methods of coherent spectroscopy - stimulated photon echo in molecular gas and laser-induced fluorescence in atomic vapour. A well developed photon echo experimental technique permitted us not only to measure relaxation rates of population, orientation and alignment on degenerated resonant levels in molecular gas but also to study their dependence on particles' longitudinal velocity. The degree of polarization of laser-induced fluorescence in Yb vapour in a mixture with Xe proves a large contribution of depolarizing collisions. The complicated non-exponential fluorescence decay at higher Yb pressures is explained by the radiation trapping.