High efficient generation of over 1 Watt 509 nm laser beam by a ring cavity frequency doubler with periodically poled KTiOPO4

摘要

We report high efficient generation of a 509 nm laser beam by a ring cavity frequency doubler with a periodically poled KTiOPO4 (PPKTP) crystal. Amaximum power of 1.13 W at 509 nm cw light is obtained with mode-matched power of 1.58 W, corresponding to a conversion efficiency of 71.5%. By using the Hansch-Couillaud locking technique, the doubler is locked with high stability, and power fluctuation smaller than +/- 0.5% within 1 h is achieved at the maximum output. To the best of our knowledge, this is the highest second-harmonic power produced by a cavity-enhanced PPKTP frequency doubler below 532 nm. (C) 2016 Optical Society of America