We describe a synchronously pumped femtosecond optical parametric oscillator based on periodically poled that is broadly tunable in the mid infrared. A transmission window of periodically poled lithium niobate beyond the conventionally accepted infrared absorption edge of has been exploited to produce idler pulses that are tunable across a wavelength range of , with milliwatt-level output powers at wavelengths as long as . We also present experimental tuning results that are in good agreement with the theoretical phase matching predicted from published infrared-corrected Sellmeier equations for .
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