We report on optical parametric oscillators (OPO's) based on periodically poled (PP RTA), which are pumped by -switched solid-state lasers. With a diode-pumped laser (pulse energy, ; pulse duration, 5.5 ns; repetition rate, 1 kHz) the PP RTA OPO generated signal and idler radiation with a signal pulse energy of . The large aperture of of the PP RTA crystal also permitted OPO operation with pump pulse energies as high as 65 mJ, provided by a flash-lamp-pumped -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.
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