Abstract
A second harmonic generation system with two type II KDP crystals in quadrature is optimized for the
nanosecond chirp pulse. The acceptance bandwidth of this optimizing scheme is close to 10 nm by using two
crystals with slightly opposite angular detuning from phase matching and the conversion efficiency can reach
70% for top-hat chirp pulse at ~2 GW/cm2 in theory. The preliminary experimental results are obtained on the
9th beam of Shen Guang II SGII laser system, and the performance of optimization is partially verified.
© 2014 Chinese Optics Letters
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