在神光II九路装置上，利用谱色散匀滑(SSD)技术结合分布式相位板(DPP)技术，研究了激光焦斑在一维、二维谱色散匀滑下的分布。结果表明，一维谱色散匀滑使焦斑的焦斑通量对比度由0.7634[均方根（RMS）]下降到0.3685（RMS），结合二维匀滑下降到0.2638（RMS）；并结合各种评价方法对焦斑进行分析。实验为谱色散匀滑技术在神光II在线应用提供了参考。

通过对分布式相位板和光谱色散匀滑技术联用的模拟计算，分析了联用实验中焦斑的变化，论证了非设计采样点光强的不可控性对焦斑匀滑质量的损害。模拟结果证实了光谱色散匀滑技术对色散方向上的焦斑均匀性的改善，焦斑不均匀性由58.30%降为19.50%。通过分析焦斑不均匀性与光谱色散匀滑积分时间的关系，发现5~6个光谱色散匀滑调制周期时得到最优匀滑效果。对焦斑频谱的分析显示，光谱色散匀滑技术可以有效抑制由非设计采样点光强引入的高频成分，26.3 μm内的光强调制被平滑，同时很好地保持了由分布式相位板决定的焦斑低频包络，在实验与模拟中均得到很好验证。为进一步的分布式相位板与光谱色散匀滑技术联用设计提供了理论依据。

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。

To improve the ability of beam smoothing in the device of inertial confinement fusion (ICF) in China, the theory of smoothing by spectral dispersion (SSD) is studied, and some experiments are carried out to analyze the mechanism of SSD in contrast with another technology of smoothing—distributed phase plane (DPP). It is found that the uniformity of focal spot in direction of dispersion is improved markedly using sinusoidal phase modulation (PM) and dispersion in SSD. And the intensity modulation of focal spot in this direction is smoothed by SSD. According to the experiments results, the changes of spectral intensity of spatial frequency at low-mode are very limited, and at high-mode are obviously; the nonuniformity varies from 40% to 12.5%. The ability of smoothing depends on the parameter of SSD. It also shows that the color cycle is very important in the process of smoothing, although the smoothing by broaden of laser spectral width for PM is poor.

为提高国内惯性约束聚变(ICF)装置的焦斑平滑能力，在对光谱色散平滑(SSD)技术理论分析的基础上，开展相关实验并研究其平滑机制。实验结合另一种焦斑平滑技术——分布式相位板(DPP)比较分析光谱色散平滑技术应用下的焦斑均匀性的变化。实验表明，利用光谱色散平滑技术中的正弦相位调制对光谱展宽并色散后，在色散方向上的焦斑均匀性有明显改善，120 μm内的光强调制被平滑，其平滑能力依赖于光谱色散平滑技术参量的选择;焦斑的低频光谱强度变化很小，但中高频光谱强度下降，焦斑质量有良好的改善，焦斑的不均匀性从40%降低到12.5%。结果还表明，光谱色散平滑技术中的关键是色循环的产生，光谱本身加宽产生的平滑作用非常有限。

Irradiation uniformity of laser on target is very important for inertial confinement fusion (ICF). The theory of smoothing by spectral dispersion (SSD) in ICF is studied by translation theory of optic, and with whether using of SSD and different parameters of SSD, the variations of irradiation nonuniformity of the surface of target are numerically simulated combined with random phase plate (RPP). The results show that application of SSD can reduce the irradiation nonuniformity of the surface of target, the variations of irradiation nonuniformity with the time are oscillating at the beginning and drive to a constant in the end. When the number of color cycle is small, the broader of laser bandwidth and the better effect of SSD are obtained.

利用光传输理论对ICF驱动器中使用的光谱色散平滑(SSD)技术作了理论分析,并结合典型的随机相位板(RPP)技术,用计算机模拟了使用光谱色散平滑技术前后激光靶面辐照不均匀性的变化及其技术中不同带宽和调制频率下激光靶面辐照不均匀性的变化。