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Optics Letters

Saturated absorption in SF_6 with double-velocity selection

Paulo C. de Oliveira, Daniel Bloch, J. R. Rios Leite

Published Sep 1, 1989• 3 citations
Publisher

Abstract

Doppler-free saturated absorption of a weak CO(2) laser probe on SF(6), which is caused by two noncollinear pump beams, is reported. A small-linewidth angular dependence was observed and can be predicted in agreement with a fifth-order perturbation calculation for a two-level atom.
DOI
10.1364/ol.14.000934

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Japanese Journal of Applied Physics•Jul 1, 1996•0 citations
Phase-conjugate emission by resonant degenerate four-wave mixing with two counterpropagating weak pump beams and a noncollinear strong object beam was calculated for a Doppler-broadened two-level system. Singlepeak Doppler-free lines with small saturation broadening at a collinear configuration became split for a wide angle. The effect is demonstrated with the use of a CO(2) laser and SF(6). Conversely, calculated line shapes with Stark splitting in a collinear arrangement became single peaked for a wide angle.
We present an analytical study of susceptibility in pump–probe laser spectroscopy for an atomic medium composed of two-level atoms in the Doppler-broadened limit. We derive an accurate analytical formula for susceptibility up to the first (arbitrary) order at the Rabi frequency of the probe (pump) beam. This is expressed in a succinct single term rather than as a complicated summation, as presented in previous papers. We also derive analytical solutions for the linewidth and peak value of the absorption spectrum of the probe beam.