AgGaS_(2) has been found to be 90° phase matchable at 192℃ for sum-frequency mixing between the output of the KTP parametric oscillator at 3.2627 μm and its pump source at 1.0642 μm. The thermooptic dispersion formula that can be used for good reproduction of the temperature-dependent phasematching conditions thus far reposed in the literature as well as our new data for second-harmonic generation of a CO_(2) laser and its hamnonics at 1.7652-5.2955 μm is presented.
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