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Quantum Electronics and Laser Science Conference

High order saturated absorption in SF6

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

Published Apr 24, 1989• 0 citations
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Abstract

Doppler-free optical pumping using two1 and three2 noncollinear pumps and a probe beam all originating from a narrow linewidth tunable cw laser has been demonstrated in metastable neon by Pinard, Julien, and Laloe.1,2 These authors refer to the close relation between this experiment and equivalent ones that can be done in saturated absorption.

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Chinese Physics B•Oct 30, 2025•0 citations
Doppler-free optical pumping using two1 and three2 noncollinear pumps and a probe beam all originating from a narrow linewidth tunable cw laser has been demonstrated in metastable neon by Pinard, Julien, and Laloe.1,2 These authors refer to the close relation between this experiment and equivalent ones that can be done in saturated absorption.
We report the measurement of Rabi oscillations in the optical pumping of a beam of metastable neon atoms in a three-level system with a cw dye laser. The laser beam is focused on the atomic beam, resulting in an interaction time with the laser beam of the order of the spontaneous lifetime of the induced transition. The Rabi oscillations are measured by a velocity-resolved analysis of the optically pumped metastable atoms. Adiabatic following is observed when the atoms cross the laser beam outside the waist, induced by the Doppler shifts due to the curvature of the wave fronts.
Abstract We report on the characterization of Doppler-free resonances detected by probing the 5S 1/2 → 6P 3/2 transition of the 87 Rb atom at 420 nm. Compared to the commonly studied 5S → 5P transition, the 5S → 6P transition offers advantages of higher transition frequency and narrower natural linewidth. We investigate how the pump laser intensity and cell temperature affect the linewidth and amplitude of the saturated absorption signal for the 420-nm second excited state transition 5S 1/2 ( F = 2) → 6P 3/2 in 87 Rb atoms. Furthermore, we introduce a 795-nm repump laser to improve the quality of the saturated absorption signal. At a relatively low vapor cell temperature of 43 °C, the amplitude-to-linewidth ratio increased by 110%. These results are highly relevant for the development of stable ultraviolet laser sources and their associated applications.