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 (AgGaS<sub>2</sub>) pumped by a 50-mW near-IR AlGaAs diode laser (λ<sub>3</sub>=0.843 μm). This amplifier is idler seeded by a 15-mW KCl:Li (F<sub>A</sub>-II) color-center laser (λ<sub>1</sub>=2.53 μm) and produces microwatt-range power of a signal radiation at λ<sub>2</sub>=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 (<i>eoo</i>) 3:1 frequency-division process and from other published data on noncritically phase-matched difference-frequency generation. The resulting dn<sub>o, e</sub>/dT values reproduce fairly well all of the reported results on temperature phase-matched parametric mixing.
© 1997 Optical Society of America
J.-J. Zondy and D. Touahri, "Updated thermo-optic coefficients of AgGaS2 from temperature-tuned noncritical 3ω ω → 2ω infrared parametric amplification," J. Opt. Soc. Am. B 14, 1331-1338 (1997)