27 February 2015 Temperature-tuned 90° phase-matched SHG and DFG in BaGa4S7
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By pumping a yellow phase, 1.4-cm-long, θ=9.2°(Φ=0°) cut BaGa4S7 crystal with a Nd:YAG laser-pumped KTP and AgGaS2 optical parametric oscillators (OPOs) and second-harmonic generation (SHG) of a frequency-doubled CO2 laser, we have achieved the 90°phase-matched type-1 SHG in the 0.8390-2.7750 μm range along the y(=a) and z(=b) axes by heating the crystal from 25ºC to 130ºC.

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, Nobuhiro Umemura, Valentin Petrov, Valentin Petrov, Valery V. Badikov, Valery V. Badikov, Kiyoshi Kato, 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); doi: 10.1117/12.2077463; https://doi.org/10.1117/12.2077463


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