We report the temperature dependence of a continuous-wave noncritically phase-matched (θ=90°) optical parametric amplifier based on a 15-mm-long silver gallium sulfide crystal (AgGaS₂) pumped by a 50-mW near-IR AlGaAs diode laser (λ₃=0.843 μm). This amplifier is idler seeded by a 15-mW KCl:Li (F_A-II) color-center laser (λ₁=2.53 μm) and produces microwatt-range power of a signal radiation at λ₂=1.265 μm. Updated linear and thermo-optic data of this chalcopyrite material, such as its room-temperature refractive indices and their temperature dependence, are devised from this type I (eoo) 3:1 frequency-division process and from other published data on noncritically phase-matched difference-frequency generation. The resulting dn_{o, e}/dT values reproduce fairly well all of the reported results on temperature phase-matched parametric mixing.

© 1997 Optical Society of America

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