15 February 2018 Upconversion of the mid-IR pulses to the near-IR in LiGaS2
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This paper reports on the phase-matching properties of LiGaS2 for upconverting a Nd:YAG laser-pumped KTP and AgGaS2 optical parametric oscillator (OPO) at mid-IR to the near-IR by mixing with its pump source together with the new Sellmeier equations that provide a good reproduction of the present experimental results as well as the published data points of second-harmonic generation (SHG) and sum-frequency generation (SFG) of a CO2 laser, a Ti:Al2O3 laser-pumped optical parametric amplifier (OPA), and a Nd:YAG laser-pumped OPO in the mid-IR.

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.
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Kiyoshi Kato, Kiyoshi Kato, Nobuhiro Umemura, Nobuhiro Umemura, Takuya Okamoto, Takuya Okamoto, Valentin Petrov, Valentin Petrov, } "Upconversion of the mid-IR pulses to the near-IR in LiGaS2", Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105161D (15 February 2018); doi: 10.1117/12.2286762; https://doi.org/10.1117/12.2286762

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