Abstract
We present refined Sellmeier equations for ${{\rm AgGaSe}_2}$ that provide good reproduction of the phase-matching angles for frequency upconversion of ${{\rm CO}_2}$ laser radiation in the 1.7652–10.5910 µm range and for frequency downconversion in the 1.85–18 µm range thus far reported in the literature.
© 2021 Optical Society of America
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