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We report on high-efficiency frequency doubling of a mode-locked diode-laser-pumped Nd:YAG laser to 532 nm in a crystal of MgO:LiNbO3 in an external enhancement ring cavity. At a pump power of 500 mW the mode-locked Nd:YAG laser produced an average power of 66 mW incident on the enhancement cavity in pulses of 12 ps duration at a repetition rate of 366 MHz. This has been frequency doubled with a conversion efficiency of 53% to produce pulses at 532 nm of 35 mW average power in bandwidth-limited pulses of 9.5 ps duration.
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Maker et al. (1989) studied this question.
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