Doppler-free saturated absorption of a weak CO2 laser probe on SF6, 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.
© 1989 Optical Society of America
Paulo C. de Oliveira, Daniel Bloch, and J. R. Rios Leite, "Saturated absorption in SF6 with double-velocity selection," Opt. Lett. 14, 934-936 (1989)