Highly efficient TW multipass Ti : sapphire laser system

An efficient chirped-pulse amplification, Ti:sapphire laser system, has bee n developed using mainly domestic components. The gain-narrowing effect has been significantly overcome by shaping spectrum of seeding pulses. With a novel aberration-free stretcher and two stage multi-pass amplifiers, pulses with duration of 25 fs and 36-mJ energy have been obtained at 10 Hz repeti tion rate, using only less than 290 mJ green Nd:YAG pump energy. This corre sponds to a 1.4 TW peak power and 32% main amplification efficiency. The en ergy stability of the laser systems is better than +/-3%.