Abstract

We report on what are, to our knowledge, the best results obtained with an orientation-patterned GaAs optical parametric oscillator (OPO) pumped by a Q-switched $2\mu \mathrm{m}$ Ho:YAG laser. Up to $2.85\mathrm{W}$ are obtained for $6.1\mathrm{W}$ of pump power, corresponding to an optical-to-optical conversion efficiency of 46.5% with a threshold of $1\mathrm{W}$. Optical damage occurred at a fluence of about $2\mathrm{J}∕{\mathrm{cm}}^2$. The thickness of the crystal limited the pump power. Slope efficiencies are of the same order as those obtained with $\text{ZnGe}{\mathrm{P}}_2$ OPOs pumped with the same Ho:YAG laser.

© 2009 Optical Society of America

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