Abstract

We report on a femtosecond Ti:sapphire laser amplifier system that generates pulse energies $>5 \mathrm{mJ}$ at a 1-kHz repetition rate. The system consists of regenerative and multipass amplifiers and uses the technique of chirped-pulse amplification. When the system was seeded with 70-fs pulses at 800 nm from a self-mode-locked Ti:sapphire oscillator, amplified pulses of 94-fs duration at a repetition rate of 1 kHz and an average output power of 5.4 W were produced. The amplified pulse-repetition rate is variable from 250 Hz to 3 kHz. Pulse energies of $>7.5 \mathrm{mJ}$ were obtained at 500 and 250 Hz.

© 1997 Optical Society of America

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