Abstract

A simple ring cavity consisting of mirrors reflecting at the second harmonic is used to generate the fourth harmonic of low-power Q-switched Nd:YAG laser pulses. A large beam waist of 1  mm minimized the effects of double refraction and thermal loading of the nonlinear crystals. By simulating the low-power pulses with a small portion of the output from a 30-Hz flash-lamp-pumped Q-switched Nd:YAG laser, we obtained IR–UV energy conversion as great as 39.5% to yield 84-mW average power at 266  nm from 213  mW of single-mode 1064-nm radiation.

© 1997 Optical Society of America

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