Study on a compact femtosecond Ti: Al₂O₃ amplifier at low repetition rate

This article described a compact and high efficient solid-state laser system based on Ti: Al₂O₃ capable of producing pulses with energy of 8mJ each at a 10Hz repetition rate. By utilization of chirped pulse amplification technique, ultrashort seed pulses with duration of 100fs and repetition rate of 82MHz generated from self-mode-locked Ti: Al ₂O₃ laser were stretched to ̃200ps with a four-pass grating stretcher. After regenerative amplification, a cavity-dumped pulse with energy greater than 2mJ was obtained. We also designed a double-pass power amplifier. The long pulses from the regenerative amplifiers were further amplified to about 8mJ with each pulse's energy. As a result, the total net gain of this system was achived 8×10⁷.