Abstract

Conversion of Q -switched 1.064-µm Nd:YAG laser pulses to the 2–2.2-mu; m 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 2.06-µm signal and 2.1 mJ at the 2.2-µm idler, with a beam quality of M2≈ 1.4 . With a ZnGeP2 -based OPO pumped by the signal from the KTP OPO we achieved 14% conversion efficiency from 1.064µm to the 3–5-µm range.

© 2002 Optical Society of America

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