Temporal shaping of laser pulse and its improvement to beam emittance

Temporal shaping of drive laser pulse was done by using pulse stacking method. Perfect result was measured by streak camera system. A quasi-ellipsoid shaping scheme based on pulse stacking was projected. The simulation results show: pulse stacking is benefit to improve the beam emittance; 8 micro pulses stacking is more effective than 4 micro pulses stacking; besides, the beam emittance will be further improved by quasi-ellipsoid shaping．