Abstract

Low-background sub-Doppler saturated absorption line shapes were obtained for SF₆ with a CO₂ laser. With the use of a high-power pump, linewidths near the collisional relaxation width have been observed. The theory for a two-level model has been calculated and shows that the rate-equation approximation overestimates the line narrowing because of the propagation effect. Consistent with experiments, for linear absorption coefficients αl of less than 15, no subnatural line is predicted.

© 1991 Optical Society of America

Saturation splitting of line shapes in noncollinear four-wave mixing in SF₆

O. Di Lorenzo-Filho, P. C. de Oliveira, and J. R. Rios Leite
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Saturated absorption in SF₆ with double-velocity selection

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