We report on a compact, tunable ultraviolet laser system that consists of an optical parametric oscillator (OPO) and a longitudinally diode-pumped Nd:YAG master oscillator–power amplifier (MOPA). The pump energy for the whole laser system is supplied via a single delivery fiber. Nanosecond pulses are produced by an oscillator that is passively Q-switched by a crystal. The OPO is pumped by the second harmonic of the Nd:YAG MOPA. Continuously tunable radiation is generated by an intracavity sum- frequency mixing process within the OPO in the range of with high beam quality. Maximum pulse energies of were achieved, which correspond to an optical efficiency of 3.75%, relating to the pulse energy of the MOPA at .
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