Abstract

We report on optical parametric oscillators (OPO's) based on periodically poled RbTiOAsO4 (PP RTA), which are pumped by Q-switched solid-state lasers. With a diode-pumped Nd:YVO4 laser (pulse energy, 800 μJ; pulse duration, 5.5  ns; repetition rate, 1  kHz) the PP RTA OPO generated 1.58μm signal and 3.26μm idler radiation with a signal pulse energy of 45 μJ. The large aperture of 3 mm×3 mm of the PP RTA crystal also permitted OPO operation with pump pulse energies as high as 65  mJ, provided by a flash-lamp-pumped Q-switched Nd:YAG laser (pulse duration, 20  ns; repetition rate, 10  Hz). With this pump source the OPO generated signal pulse energies as high as 17  mJ, corresponding to an efficiency of 26%. The performance of this OPO shows that large-aperture PP RTA crystals are well suited for pulsed nanosecond OPO operation with pump pulse energies of tens of millijoules.

© 1999 Optical Society of America

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