在惯性约束聚变中,辐照的均匀性直接影响到内爆实验的效果,通常结合各种空间、时间平滑技术提高光束的均匀性。光谱色散平滑技术正是一种常用的时间平滑技术,其核心是频谱展宽技术。为提高频谱展宽的效果,将单通的腔式调制器设计成双通调制器,以满足光谱色散平滑技术中频谱展宽的要求。理论上计算了双通调制器情况下的速度匹配条件,得到了一个清晰的表达式,同时在实验上验证了理论分析的正确性,以此验证了双通调制器的可行性。最后基于以上方案,进一步提出了改进成多通调制器的构想。

On the experiment of inertial confinement fusion,the success of implosion experiments is depended on the irradiation uniformity. In order to improve the uniformity of laser imtensity,time smoothing technologies are always applied with spatial technologies. Technology of smoothing by spectral dispersion is one of the familiar time smoothing technologies,and spectral broadening is the core technology. To improve the effect of spectral broadening,a double-pass phase modulator which would meet the need of spectral broadening of technology of smoothing by spectral dispersion is designed instead of the old single-pass phase modulator. The matching condition under double-pass modulator is calculated theoretically,and a satisfying result is also attained in the experiment,so the feasibility of double-pass phase modulator is validated. Based on the above discussion,another idea of multiple-pass phase modulator is mentioned.