Abstract
A high-energy mid-infrared ZnGeP2 (ZGP) optical parametric oscillator (OPO) based on the nonplanar fractional-image-rotation enhancement resonator pumped by a 2.05μm Ho3+:YLF laser is presented. Up to 120mJ pulse energy in a rotationally symmetric beam is generated in the 3-5μm wavelength range at 1Hz repetition rate. Slope efficiencies of up to 78% are achieved with respect to the pump pulse energy incident onto the ZGP crystal. The OPO pulses have a duration close to 15ns, corresponding to a maximum peak power of 8MW. A measurement of M2 dependence on pump beam diameter is presented.
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