We report a high-efficiency continuously tunable single-frequency doubly resonant optical parametric oscillator (OPO) based on periodically poled KTiOPO4. Pumped by a frequency-doubled Nd:YLF laser at $526.5\mathrm{nm}$ , the OPO has a low threshold of $30\mathrm{mW}$ and can deliver up to $156\mathrm{mW}$ single-frequency output at $0.8\mathrm{\mu m}$ and $89\mathrm{mW}$ single-frequency output at $1.5\mathrm{\mu m}$ with $390\mathrm{mW}$ of pump power. Coarse and continuous frequency tuning are also demonstrated experimentally.

© 2011 Optical Society of America

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