Abstract
This paper reports on the phase-matching properties of LiGaS 2 for upconverting a Nd:YAG laser-pumped KTP and AgGaS 2 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 CO 2 laser, a Ti:Al 2 O 3 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) (Δ sp = 1/υ s - 1/υ p ) of LiGaS 2 in the 4 - 11 μm range is 12 ~ 27 fs/mm lower than that of the widely used LiInS 2 , 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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