Abstract

The use of periodically poled KTiOPO4 as a gain medium in efficient nanosecond optical parametric oscillators pumped by a flash-lamp-pumped Qswitched Nd:YAG laser is demonstrated. Parametric radiation in the 1.82.5µm spectral region was achieved when the crystal temperature was tuned from 10 to 100 °C. A maximum total output energy of 1.8 mJ was obtained at a pump level of 3.5 mJ. Stable operation was achieved, with conversion efficiencies reaching 50%. No gray tracking or laser damage was observed, even for pump intensities of 450 MW/cm2.

© 1999 Optical Society of America

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