High-efficiency intracavity continuous-wave green-light generation by quasiphase matching in a bulk periodically poled MgO: LiNbO 3 crystal

Abstract

908mW of green light at 532nm were generated by intracavity quasiphase matching in a bulk periodically poled MgO: LiNbO 3 (PPMgLN) crystal. A maximum optical-to-optical conversion efficiency of 33.5 was obtained from a 0.5mm thick, 10mm long, and 5mol MgO: LiNbO 3 crystal with an end-pump power of 2.7W at 808nm. The temperature bandwidth between the intracavity and single-pass frequency doubling was found to be different for the PPMgLN. Reliability and stability of the green laser were evaluated. It was found that for continuous operation of 100 hours, the output stability was better than 97.5 and no optical damage was observed.