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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。
In inertial confinement fusion, the uniformity of irradiation directly affects the effect of implosion experiment, usually combining various space and time smoothing techniques to improve the uniformity of light beam. Spectral dispersion smoothing technique is a commonly used time-smoothed technique whose core is spectrum broadening technique. In order to improve the spectrum broadening effect, the single-pass cavity modulator is designed as a two-pass modulator to meet the requirement of spectral broadening in the spectral dispersion smoothing technique. In theory, the speed matching condition of dual-pass modulator is calculated and a clear expression is obtained. At the same time, the correctness of the theoretical analysis is verified experimentally to verify the feasibility of the dual-pass modulator. Finally, based on the above scheme, further proposed to improve the multi-pass modulator concept.