We report the generation of continuous-wave (cw) tunable mid-infrared (mid-IR) radiation across 4608-4694 nm with multi-tens of mW level output power using difference-frequency-generation (DFG) in the new nonlinear material, orientation-patterned gallium phosphide (OP-GaP). A 40-mm-long OP-GaP (Λ=85.1 μm) is used for DFG, pumped with a cw Tm-fiber laser and a home-built cw Yb-fiber-pumped MgO:PPLN-based optical parametric oscillator (OPO). By varying MgO:PPLN crystal temperature and simultaneously adjusting the phase-matching temperature in OP-GaP, with an input pump power of 34 W at 2010 nm and OPO idler power of >2.9 W across 3505-3557 nm, we achieved DFG tuning across 4608-4694 nm, providing >30 mW of output power across 96% of the full tuning range with 43 mW at 4608 nm. The output at 4608 nm exhibits high beam quality, with a passive power stability of 2.5% rms over 1.5 mins. The performance of the system at high pump powers, temperature acceptance bandwidth, DFG spectral characteristics, and spatial quality has been investigated.
Kavita Devi, A. Padhye, P. G. Schunemann, and M. Ebrahim-Zadeh, "Continuous-wave, multi-milliwatt, tunable difference-frequency generation across 4608-4694 nm in orientation-patterned GaP ," Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 1068410 (Presented at SPIE Photonics Europe: April 25, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2306858.
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