Abstract
We report an optical parametric generator (OPG) based on the new nonlinear material, orientation-patterned gallium phosphide (OP-GaP). Pumped by a Q-switched nanosecond Nd:YAG laser at 1064nm with 25kHz pulse repetition rate, the OPG can be tuned across 1721-1850nm in the signal and 2504-2787nm in the idler. Using a 40-mm-long crystal in single-pass configuration, we have generated a total average output power of up to ∼18 mW, with ∼5 mW of idler power at 2670nm, for 2W of input pump power. The OPG exhibits a passive stability in total output power better than 0.87% rms over 1h, at a crystal temperature of 120°C, compared to 0.14% rms for the input pump. The output signal pulses, recorded at 1769nm, have duration of 5.9ns for input pump pulses of 9ns. Temperature-dependent loss measurements for the pump polarization along the [100] axis in the OP-GaP crystal have also been performed, for the first time, indicating a drop in transmission from 28.8% at 50°C to 19.4% at 160°C.
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