Abstract
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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