Narrow-bandwidth tunable picosecond pulses in the visible produced by noncollinear optical parametric amplification with a chirped blue pump

Abstract

Narrow-bandwidth ($\sim 27{\mathrm{cm}}^{-1}$) tunable picosecond pulses from $480\mathrm{nm}–780\mathrm{nm}$ were generated from the output of a $1\mathrm{kHz}$ femtosecond titanium:sapphire laser system using a type I noncollinear optical parametric amplifier (NOPA) with chirped second-harmonic generation (SHG) pumping. Unlike a femto second NOPA, this system utilizes a broadband pump beam, the chirped $400\mathrm{nm}$ SHG of the Ti:sapphire fundamental, to amplify a monochromatic signal beam (spectrally-filtered output of a type II collinear OPA). Optimum geometric conditions for simultaneous phase- and group-velocity matching were calculated in the visible spectrum. This design is an efficient and simple method for generating tunable visible picosecond pulses that are synchronized to the femtosecond pulses.

© 2010 Optical Society of America

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