Wave mixing with a self-induced grating in a saturable absorber, which is inserted into a resonator, gives special filtering behavior. In a linear Fabry—Perot cavity with gain, the grating forms a self-matched, threemirror laser cavity that can discriminate between modes whose frequency difference is much lower than the grating bandwidth. The effect was used to obtain single-mode lasers with narrow linewidths. The selfinduced grating can dynamically adjust itself to small disturbances and changes in the cavity parameters.
© 1996 Optical Society of America
Moshe Horowitz, Ron Daisy, and Baruch Fischer, "Filtering behavior of a self-induced three-mirror cavity formed by intracavity wave mixing in a saturable absorber," Opt. Lett. 21, 299-301 (1996)