Abstract
Conversion of -switched Nd:YAG laser pulses to the region with 46% efficiency is demonstrated with a KTP-based type 2 phase-matched optical parametric oscillator (OPO) with two pairs of walk-off compensating crystals in a ring resonator. With 10 mJ of pump energy, we obtain 2.5 mJ at the signal and 2.1 mJ at the idler, with a beam quality of . With a -based OPO pumped by the signal from the KTP OPO we achieved 14% conversion efficiency from to the range.
© 2002 Optical Society of America
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