From Event: SPIE LASE, 2019
We designed a high-efficient acousto-optic Q-switch based on a potassium yttrium tungstate crystal (KY(WO4)2), or KYW. Isotropic acousto-optic interaction along NmNg plane of dielectric axes of the crystal was used. The Q-switch operated at the wavelength of 2.1 μm of a Ho:YAG laser with the diffraction efficiency over 60% at the RF driving power of 20 W. No laser damage of the crystal with antireflection coatings was observed at 12 J/cm2 fluence for nanosecond pulses.
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Konstantin B. Yushkov, Alexander I. Chizhikov, Natalya F. Naumenko, Vladimir Ya. Molchanov, Anatoly A. Pavlyuk, Elena V. Makarevskaya, and Nikita G. Zakharov, "KYW crystal as a new material for acousto-optic Q-switches," Proc. SPIE 10899, Components and Packaging for Laser Systems V, 1089913 (Presented at SPIE LASE: February 07, 2019; Published: 4 March 2019); https://doi.org/10.1117/12.2503776.
