Abstract

We describe a highly efficient monolithic, Q-switched, nanosecond optical parametric oscillator based on a magnesium-oxide-doped periodically poled lithium niobate crystal and containing multiple quasi-phase-matched gratings. The crystal consisted of a single unchirped grating and five gratings containing progressively increasing amounts of longitudinal chirp. The monolithic design makes the device highly compact, stable, and robust, and it demonstrated a pump-to-signal conversion efficiency of around 50%, generating 50μJ pulses at 1.55μm with a spectral bandwidth of 20nm. Sonogram traces are presented showing the effect of crystal chirp on the temporal and spectral performance.

© 2007 Optical Society of America

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