Optical parametric oscillation in quasi-phase-matched GaP

Peter G. Schunemann; Leonard A. Pomeranz; Daniel J. Magarrell

doi:10.1117/12.2080821

24 March 2015 Optical parametric oscillation in quasi-phase-matched GaP

Peter G. Schunemann, Leonard A. Pomeranz, Daniel J. Magarrell

Proceedings Volume 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV; 93470J (2015) https://doi.org/10.1117/12.2080821
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

Orientation patterned gallium phosphide (OP-GaP) is a new quasi-phase-matched (QPM) nonlinear optical (NLO) semiconductor for mid-infrared frequency generation. It overcomes several limitations of ZGP, the current NLO crystal of choice for 2-μm-pumped optical parametric oscillators (OPOs): OP-GaP exhibits lower 2-μm absorption loss, higher thermal conductivity, noncritical phase matching via quasi-phase matching (QPM), and a larger band gap that allows for pumping at 1064 nm. Here we report the first OPO based on bulk OP-GaP. Multi-grating OP-GaP QPM structures were grown by polar-on-nonpolar molecular beam epitaxy (MBE), lithographically patterned, reactive ion etched, and regrown by MBE to yield templates for subsequent bulk growth by low-pressure hydride vapor phase epitaxy (LP-HVPE). A Tm-fiber-pumped Ho:YAG pump laser was line narrowed with a volume Bragg grating (2090nm, 20W, 20kHz, 12 ns) and linearly polarized along the <100> orientation of the AR-coated 16.5 x 6.3 x 1.1 mm³ OP-GaP crystal (QPM layer = 800 μm thick, grating period = 92.7 μm) mounted on a copper blocked maintained at 20°C by a thermo-electric cooler. The OPO cavity was a linear resonator with 10-cm ROC mirrors coated for DRO operation (85%R at signal, 55%R at idler). The pump spot size at the crystal face was 250 μm. The observed OPO threshold was 3.1 W (44 MW/cm²) with a slope efficiency of 16% and a maximum output power of 350 mW until surface damage occurred at 1.25 to 1.5 J/cm². The signal (3.54 μm) and idler (5.1 μm) output wavelengths agreed well with sellmeier predictions.

Citation Download Citation

Peter G. Schunemann, Leonard A. Pomeranz, and Daniel J. Magarrell "Optical parametric oscillation in quasi-phase-matched GaP", Proc. SPIE 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 93470J (24 March 2015); https://doi.org/10.1117/12.2080821

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