Abstract

We report efficient generation of high-power, cw, single-frequency radiation in the green in a simple, compact configuration based on single-pass, second-harmonic generation of a cw ytterbium fiber laser at 1064nm in periodically poled KTiOPO4. Using a crystal containing a 17 mm single grating with period of 9.01μm, we generate 6.2W of cw radiation at 532nm for a fundamental power of 29.75W at a single-pass conversion efficiency of 20.8%. Over the entire range of pump powers, the generated green output is single frequency with a linewidth of 8.5MHz and has a TEM00 spatial profile with M2<1.34. The demonstrated green power can be further improved by proper thermal management of crystal heating effects at higher pump powers and also by optimized design of the grating period to include thermal issues.

© 2008 Optical Society of America

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