A singly resonant optical parametric oscillator is reported that uses a periodically poled LiNbO3 crystal and is synchronously pumped by a cw mode-locked 1.047-μm Nd:YLF laser. Picosecond pulses were tunable from 1.67 to 2.806 μm. Mean output powers of 120 mW (90 mW) were obtained for the signal (idler) wave with an overall slope efficiency of 61% at a pump depletion of 75% when the oscillator was operating at three times above threshold.
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