Abstract

We describe a high-repetition-rate femtosecond optical parametric oscillator (OPO) that was broadly tunable in the mid infrared. The all-solid-state-pumped OPO was based on quasi-phase matching in periodically poled lithium niobate. The idler was tunable from approximately 1.7 µm to beyond 5.4 µm, with maximum average power levels greater than 200  mW and more than 20  mW of average power at 5.4 µm. We used interferometric autocorrelation to characterize the mid-infrared idler pulses, which typically had durations of 125  fs. This OPO had a pumping threshold as low as 65  mW of average pump power, a maximum conversion efficiency of >35% into the near-infrared signal, a slope efficiency for the signal of approximately 60%, and a maximum pump depletion of more than 85%.

© 1997 Optical Society of America

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