Abstract
Efficient single-pass second-harmonic generation (SHG) of tunable high-repetition-rate picosecond pulses into the blue is reported in the nonlinear crystal . Using 2.4 ps fundamental pulses from a mode-locked Ti:sapphire laser at 76 MHz and a 10 mm crystal cut for type I phase matching in the optical plane, second-harmonic average powers as high as 990 mW with excellent stability have been generated at 52% conversion efficiency, and a tunable range of 370–450 nm is demonstrated. From measurements of single-pass SHG in the continuous-wave regime an effective nonlinear coefficient of has been verified for , and direct comparison with confirms a SHG power enhancement of for the same crystal length. Autocorrelation measurements in a crystal of result in durations of 2.8 ps for the second-harmonic blue pulses.
© 2005 Optical Society of America
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