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High power operation of a continuously-tunable doubly resonant optical parametric oscillator

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We report on an all-solid-state source of broadly tunable single-frequency radiation from a continuous-wave (CW), doubly resonant optical parametric oscillator (OPO) based on non-critically phase-matched magnesium oxide-doped lithium niobate (MgO:LiNbO3). The oscillator is pumped at 532 nm by the second harmonic of a single-frequency Nd:YAG miniature ring laser and provides combined signal and idler output power of nearly 400 mW CW. Covering a tuning range between 1007 and 1128 nm, stable operation on a single-axial-mode pair is obtained for several hours without mode hops by use of an FM sideband-locking technique. The output frequencies of the OPO can be continuously tuned over a range of 8 GHz via precise control of the pump laser frequency. We demonstrate that operation of frequency doubler and OPO cavities with watt level pump powers is not necessarily deteriorated by optical degradation due to thermal or photorefractive effects.

© 1998 Optical Society of America

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