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An energy conversion efficiency of 80% for second-harmonic generation of 532-nm radiation from 1064-nm radiation has been achieved with a single KTP crystal and a commerical injection-seeded Q-switched Nd:YAG laser. A second-harmonic output of 720 mJ was generated with 900 mJ of incident 1064-nm radiation at 10 Hz.
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Brown et al. (1992) studied this question.
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