Refined Sellmeier equations for AgGaS2 down to 0.565 µm

We revisit the 90° phase-matching conditions for second-harmonic, sum-frequency, and difference-frequency generation in AgGaS2 thus far reported in the literature. We present refined Sellmeier equations coupled with an updated thermo-optic dispersion formula to correctly reproduce the experimental results for noncritical three-wave interactions obtained in the 0.565-10.5910 µm spectral range.