Abstract

We report high efficient generation of a 509 nm laser beam by a ring cavity frequency doubler with a periodically poled KTiOPO4 (PPKTP) crystal. A maximum 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 Hänsch–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.

© 2016 Optical Society of America

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