We report the measurement of the absolute <i>d</i><sub>36</sub>nonlinear coefficient of silver gallium sulfide (AgGaS<sub>2</sub>) from three phase-matched nonlinear interactions spanning from 10.2 to 0.78 μm: the sum-frequency of a CO<sub>2</sub> laser (10.2 μm) and anear-IR AlGaAs diode laser (0.842 μm), the second-harmonic generation of a KCl:Li color-center laser (2.53 μm), and the noncritically phase-matched 3ω − ω → 2ω difference frequency between the AlGaAs diode laser and the KCl:Li laser to generate 1.265 μm. From thetheoretical evaluation of the Gaussian-beam aperture functions for these type I interactions with arbitrary focusing parameters, beam-waist locations, and absorption losses, we have deduced from the three processes the same consistent value <i>d</i><sub>36</sub> = 13 (±2) pm/V for AgGaS<sub>2</sub>. Our value is independent of the growth origin of the material. In light of the trustworthy value of <i>d</i><sub>36</sub> measured from our experiments we analyze the feasibility of a continuous-wave doubly resonant parametric oscillator-(DRO-)based 3:1 frequency divider pumped by a near-IR diode laser.The predicted pump power threshold for the ring-resonator DRO lies in the range of 70–140 mW for a 14–18-mm-long sample with an absorption loss near the level of 1% cm<sup>−1</sup> at the output frequencies.
© 1997 Optical Society of America
J.-J. Zondy, D. Touahri, and O. Acef, "Absolute value of the d36 nonlinear coefficient of AgGaS2: prospect for a low-threshold doubly resonant oscillator-based 3:1 frequency divider," J. Opt. Soc. Am. B 14, 2481-2497 (1997)