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, three-mirror 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 self-induced grating can dynamically adjust itself to small disturbances and changes in the cavity parameters.
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