Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Velocity-selective optical pumping and interference oscillations in the absorption of Rb atoms in a weak magnetic field

Igor M. Beterov, A. Dudnikov, Vasily M. Entin, I. I. Ryabtsev

Published Oct 21, 1998• 0 citations

Abstract

The experiments on transient phenomena in pulsed optical orientation of Rb atoms by the emissions of semiconductor lasers are presented. With using probe field method it was found that macroscopic magnetic momentum induced by strong pulsed laser field is processing in weak magnetic field causing Larmor oscillations of the absorption coefficient of probe field. The same effect was observed at fast changing of direction of the magnetic field.

DOI: 10.1117/12.328274

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Velocity-selective optical pumping and interference oscillations in the absorption of Rb atoms in a weak magnetic field

Igor M. Beterov, A. Dudnikov, Vasily M. Entin, I. I. Ryabtsev

Published Oct 21, 1998• 0 citations

Publisher

Abstract

DOI: 10.1117/12.328274

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{\mathrm{}}^{2}

{S}_{1/2}

(F=2)\ensuremath{\rightarrow}(3p)

{\mathrm{}}^{2}

{P}_{1/2}

(F'=1) component of the

{D}_{1}

line. The intensity of fluorescent light was observed as a function of the laser intensity for various strengths of the magnetic field B. Trapping in the

{M}_{F}

=\ifmmode\pm\else\textpm\fi{}2 levels of the ground state could be observed to be of decreasing importance for an increasing component of B perpendicular to the laser polarization \ensuremath{\epsilon}^. For laser intensities increasing beyond certain critical values, however, the fluorescence decreased and trapping seemed to become again important. For a quantitative explanation of the observed behavior we describe the system by generalized rate equations for the density matrix. We find that stimulated absorption and emission processes effectively inhibit the Larmor precession, thereby enforcing the trapping effect. Precession can only take place at sufficiently low light intensities.