Abstract
A four-pass quadrature frequency conversion scheme was developed to generate green output with high efficiency for pumping an ultrashort pulse laser system. With this scheme, an efficiency from fundamental energy into total second harmonic energy in excess of 80% was achieved for frequency doubling of 1064 nm in KTP with a low input fundamental laser intensity of 76 MW/cm 2. A total 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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