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The diffraction limited emission of a traveling wave single pass 600-μm wide SQW GaAlAs amplifier injected by a Ti:Sapphire laser was frequency doubled in KNbO3 to generate 400 mW peak power 5 μs long pulses of 431 nm light. A maximum single pass frequency conversion efficiency of 6.3% was observed.
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Goldberg et al. (1992) studied this question.
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