Difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide crystals

Giacomo Insero; Cecilia Clivati; Davide D’Ambrosio; Paolo De Natale; Gabriele Santambrogio; Peter G. Schunemann; Jean-Jacques Zondy; Simone Borri

doi:10.1364/OL.41.005114

Optics Letters
Vol. 41,
Issue 21,
pp. 5114-5117
(2016)
•https://doi.org/10.1364/OL.41.005114

Difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide crystals

Giacomo Insero, Cecilia Clivati, Davide D’Ambrosio, Paolo De Natale, Gabriele Santambrogio, Peter G. Schunemann, Jean-Jacques Zondy, and Simone Borri

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Giacomo Insero, Cecilia Clivati, Davide D’Ambrosio, Paolo De Natale, Gabriele Santambrogio, Peter G. Schunemann, Jean-Jacques Zondy, and Simone Borri, "Difference frequency generation in the mid-infrared with orientation-patterned gallium phosphide crystals," Opt. Lett. 41, 5114-5117 (2016)

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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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$f (mm)$	$w_{p} (μm)$	$w_{s} (μm)$	$w_{i} (μm)$	$z_{i} (mm)$
150	67.5	82.5	52.24	4.67
100	45	55	34.83	2.07
75	27	33	20.90	0.75
50	19	23	14.65	0.37

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Optics Letters