Radially polarized and passively Q switched Nd:YAG laser with composite structur

We report on a radially polarized and passively Q-switched Nd:YAG/Cr4+:YAG laser. The bulk Nd:YAG crystal is bonded with two undoped YAG crystal end caps to weaken the thermal lens e?ect and thus, enhance the extraction of stored energy in the bulk gain material. In the absence of active water cooli