A technique for designing unstable resonators for low gain lasers has been developed. The technique features a Gaussian reflectivity mirror (GRM) output coupler whose central reflectivity can be much higher than the conventional 1/m2 and allows the production of an output beam which does not have a large depression in the center. It uses a phase structure on the end mirror to alter the Gaussian mode inside the cavity in such a way that, after passing through the high-reflectivity Gaussian output coupler, it will result in a flat output profile.
|Original language||English (US)|
|Number of pages||2|
|Journal||Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS|
|State||Published - Dec 1 1999|