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A four-pass quadrature frequency conversion scheme was developed for achieving high conversion efficiency. With this scheme, an efficiency in excess of 80% was achieved for frequency doubling of 1064 nm in KTP with a low input fundamental laser intensity of 76MW/cm 2 . A second-harmonic output of 486 mJ was obtained with 607 mJ of the input 1064 nm fundamental laser at 10 Hz.
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