Femtosecond lasers are pulses that have very short duration and high instantaneous power.It has greatly enhanced the development of ultrafast-physics, femtosecond chemistry,biology,nonlinear optics and so on.One of the main aims of femtosecond lasers is to build high energy solid laser system with focused intensity reaching relativistic or super-relativistic.Recently,with the use of wide band solid laser materials and Chirp pulse amplification(CPA),the technology of ultrafast lasers has experienced ...