Low-threshold, high-repetition-frequency femtosecond optical parametric oscillator based on chirped-pulse frequency conversion

We report the first demonstration of a femtosecond optical parametric oscillator based on chirped-pulse frequency conversion in a long crystal of aperiodically poled potassium titanyl phosphate. The minimum pump threshold power was 14.4 mW and a signal slope efficiency of 35% was achieved. Continuous tuning from 1194–1455 nm was obtained for an average pump power of 750 mW.

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