Abstract
Efficient generation of tunable femtosecond pulses in the blue is reported in the nonlinear crystal . By use of fundamental pulses from a mode-locked Ti:sapphire laser at 76 MHz, single-pass second-harmonic average powers of as much as 830 mW have been generated at 50% conversion efficiency, and a tunable range of 375–435 nm in the blue is demonstrated. Temporal measurements using cross correlation of the fundamental and second-harmonic pulses in a -thick crystal result in blue pulse durations of 220 fs for 130-fs fundamental pulses. Direct experimental comparison with confirms the superior performance for second-harmonic generation of femtosecond pulses.
© 2004 Optical Society of America
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