Synchronously Pumped Femtosecond Optical Parametric Oscillator Based on MgO-Doped Periodically Poled LiNbO3

We report a femtosecond optical parametric oscillator based on MgO-doped PPLN synchronously pumped by a mode-locked Ti:sapphire laser. The wavelengths of the signal and idler are continuously tuned from 1100 to 1300 nm and from 2080 to 2930 nm, respectively, by changing the pump wavelength and the OPO cavity length. The maximum signal output power of 130 mW at the wavelength of 1225 nm is obtained, pumped by 900 mW of 800 nm laser radiation. This corresponds to a total conversion efficiency of 22.1%. The signal pulse duration is measured to be 167 fs by intensity autocorrelation with chirped mirrors for intracavity dispersion compensation.