激光脉冲时域整形及其对发射度的改善效果

Temporal shaping of laser pulse and it's improvement to beam emittance

利用脉冲堆积法对驱动激光脉冲进行了时域整形,并利用条纹相机测量到了理想的整形结果。在脉冲堆积法的基础上,给出了近似椭球体整形的方案。模拟结果表明:利用脉冲堆积法整形后得到激光脉冲驱动光阴极可以获得更小的发射度;对于测量到的半高全宽(FWHM)为3.82 ps的脉冲,8个子脉冲堆积比4个子脉冲堆积更为有利;此外,对激光脉冲作近似椭球体整形可以进一步降低束流发射度。

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 showed： 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.