We report on the generation of coherent mid-infrared radiation around 5.85 μm by difference frequency generation (DFG) of a continuous-wave Nd:YAG laser at 1064 nm and a diode laser at 1301 nm in an orientation-patterned gallium phosphide (OP-GaP) crystal. We provide the first characterization of the linear, thermo-optic, and nonlinear properties of OP-GaP in a DFG configuration. Moreover, by comparing the experimental efficiency to Gaussian beam DFG theory, we derive an effective nonlinear coefficient d = 17(3) pm/V for first-order quasi-phase-matched OP-GaP. The temperature and signal wavelength tuning curves are in qualitative agreement with theoretical modeling.
Difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide crystals / Insero G.; Clivati C.; D'Ambrosio D.; De Natale P.; Santambrogio G.; Schunemann P.G.; Zondy J.-J.; Borri S.. - In: OPTICS LETTERS. - ISSN 0146-9592. - ELETTRONICO. - 41:(2016), pp. 5114-5117. [10.1364/OL.41.005114]
Difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide crystals
Insero G.;
2016
Abstract
We report on the generation of coherent mid-infrared radiation around 5.85 μm by difference frequency generation (DFG) of a continuous-wave Nd:YAG laser at 1064 nm and a diode laser at 1301 nm in an orientation-patterned gallium phosphide (OP-GaP) crystal. We provide the first characterization of the linear, thermo-optic, and nonlinear properties of OP-GaP in a DFG configuration. Moreover, by comparing the experimental efficiency to Gaussian beam DFG theory, we derive an effective nonlinear coefficient d = 17(3) pm/V for first-order quasi-phase-matched OP-GaP. The temperature and signal wavelength tuning curves are in qualitative agreement with theoretical modeling.
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