Department of Physics2024-11-0919980146-959210.1364/OL.23.0000612-s2.0-0031672580http://dx.doi.org/10.1364/OL.23.000061https://hdl.handle.net/20.500.14288/15028We report a femtosecond optical parametric oscillator based on a periodically poled KTiOPO4 crystal for which quasi-phase matching is achieved with a 24−µm poling period. The singly resonant parametric oscillator, synchronously pumped by a Ti:sapphire laser at a wavelength of 758 nm, generates a signal at 1200 nm and an idler at 2060 nm. The maximum signal power conversion efficiency of the device is 22% with a pump depletion of 69%. We tune the signal wavelength over a 200-nm band by changing the cavity length. In addition, pump wavelength tuning provides output tunability in the 1000–1235-nm range. OpticsJournal Article71271100021Q28037