Singly resonant type-il AgGaS2OPO yielded continuously tunable 3.9–11.3 µm idler output with slope quantum efficiency up to 41 % (absolute photon efficiency 22%). The OPO has sub-100 µJ threshold pump energies for nanosecond 1.06µm Nd:YAG laser pulses.
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Vodopyanov, K.L., Maffetone, J., Zwieback, I. et al. The Longest Wavelength OPO Pumped by a 1µm Laser. MRS Online Proceedings Library 607, 165 (1999). https://doi.org/10.1557/PROC-607-165