A model of degenerate four-wave mixing (DFWM) in Cr4+:YAG saturable absorbers is given in the transient regime. Because of the presence of absorbing dipoles oriented along specific directions, the DFWM process exhibits an anisotropic behavior. The effects of pump beam fluences, relative polarization of the beams, crystal orientation, absorbance, excited-state absorption, and nonresonant losses are analyzed. The theoretical results are supported by DFWM experiments in Cr4+:YAG performed at 1.06 µm with nanosecond pulses.
© 1996 Optical Society of America
Arnaud Brignon, "Anisotropic properties of pulsed four-wave mixing in Cr4+:YAG saturable absorbers," J. Opt. Soc. Am. B 13, 2154-2163 (1996)