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 50 µJ pulses at 1.55 µm with a spectral bandwidth of 20 nm. Sonogram traces are presented showing the effect of crystal chirp on the temporal and spectral performance. © 2007 Optical Society of America.
| Original language | English |
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| Pages (from-to) | 1548-1550 |
| Number of pages | 3 |
| Journal | Optics Letters |
| Volume | 32 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 1 Jun 2007 |