Abstract

We describe a synchronously pumped femtosecond optical parametric oscillator based on periodically poled LiNbO<sub>3</sub> that is broadly tunable in the mid infrared. A transmission window of periodically poled lithium niobate beyond the conventionally accepted infrared absorption edge of 5.4 μm has been exploited to produce idler pulses that are tunable across a wavelength range of 4 μm , with milliwatt-level output powers at wavelengths as long as 6.8 μm . We also present experimental tuning results that are in good agreement with the theoretical phase matching predicted from published infrared-corrected Sellmeier equations for LiNbO<sub>3</sub> .

© 1999 Optical Society of America

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