In addition, by mixing the signal outputs of a Nd:YAG laser-pumped KTP/OPO and its pump source, we have achieved the 90°phase-matched type-1 difference-frequency generation (DFG) in the 5.341-7.506μm range along the z axis at a crystal temperature of 25-185ºC. The Sellmeier and thermo-optic dispersion formulas that reproduce well these experimental results are presented.
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Nobuhiro Umemura, Valentin Petrov, Valery V. Badikov, Kiyoshi Kato, "Temperature-tuned 90° phase-matched SHG and DFG in BaGa4S7," Proc. SPIE 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 93470N (27 February 2015);