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This index formula gives the important information that group velocity mismatch (GVM) (Δsp = 1/υs - 1/υp) of LiGaS2 in the 4 - 11 μm range is 12 ~ 27 fs/mm lower than that of the widely used LiInS2, which makes it ideal for the upconversion of the mid-IR femtosecond pulses having large spectral bandwidths to the near-IR.
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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