Orientation-patterned gallium phosphide (OP-GaP) crystals are used here for the first time for the generation of continuous-wave coherent mid-infrared radiation around 5.85 μm by difference frequency generation (DFG) of a Nd:YAG laser at 1064 nm and a diode-laser at 1301 nm. We provide the first characterization of the linear, thermo-optic and nonlinear properties of OP-GaP in a DFG configuration, and we derive an effective nonlinear coefficient deff = 17 pm/V (3) for first-order quasi-phase-matched OP-GaP. This novel nonlinear material can be used to referenced the mid-IR light to a frequency standard by locking the pump and signal laser to a near-IR optical frequency comb.
G. Insero, C. Clivati, D. D'Ambrosio, P. De Natale, G. Santambrogio, P. G. Schunemann, J.-J. Zondy, and S. Borri, "Continuous-wave difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide (OP-GaP) crystals," Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 100880W (Presented at SPIE LASE: February 01, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2251334.
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