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We revisit the 90° phase-matching conditions for second-harmonic, sum-frequency, and difference-frequency generation in AgGaS 2 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.
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Katō et al. (2023) studied this question.
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