Updated thermo-optic coefficients of AgGaS2 from temperature-tuned noncritical 3 omega-omega->2 omega infrared parametric amplification

摘要

We report the temperature dependence of a continuous-wave noncritically phase-matched (theta = 90 degrees) optical parametric amplifier based on a 15-mm-long silver gallium sulfide crystal (AgGaS2) pumped by a 50-mW near-IR AlGaAs diode laser (lambda(3) = 0.843 mu m). This amplifier is idler seeded by a 15-mW KCI:Li (F-A-II) color-center laser (lambda(1) = 2.53 mu m) and produces microwatt-range power of a signal radiation at lambda(2) = 1.265 mu m. 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. (C) 1997 Optical Society of America.