Abstract

Thermally induced index change limits the high power operation of nonlinear wavelength converters. Thermal dephasing, longitudinal, reduces the efficiency and thermal lensing, radial, also deteriorates beam quality with instability. We demonstrated CW 19 W single-pass green SHG using a periodically poled Mg-doped stoichiometric lithium tantalate (PPMgSLT) module with a high heat-removal performance by reducing heat flow pass as short as 0.15 mm to metal [1]. In this work, we further examined the performance depending on focusing condition. The enhancement is demonstrated by choosing an appropriate focusing parameter, and thermal lensing in the module is investigated.

© 2013 Japan Society of Applied Physics, Optical Society of America