Second-harmonic generation was observed in a 7-mm-thick 3-methyl-4-nitropyridine-1-oxide crystal at the 1.32 and 1.34 μm emission lines of a Q-switched, mode-locked Nd3+:YAG laser, emitting short pulses of duration of 160 ps. A remarkably high effective conversion rate of 50% was measured by pump depletion in a type-I phase-matched configuration.
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Josse et al. (1988) studied this question.
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