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为满足激光惯性约束聚变中靶面激光辐照不均匀性低于5%的要求,在目前使用透镜列阵基础上,提出了谱色散平滑与透镜列阵联用方案,对其进行数值计算并分析其平滑效果和应用可行性。结果表明:焦斑的不均匀性从单独使用透镜列阵时的14%降低到与谱色散平滑结合后的3%;对焦斑点功率谱的分析表明谱色散平滑通过抑制焦斑中高频的频谱强度达到平滑效果。该方案可以进一步提高焦斑平滑效果,计算结果对实际应用有着重要的参考意义。
In order to meet the requirement of less than 5% laser beam irradiation in the laser inertial confinement fusion, based on the currently used lens array, a scheme of spectral dispersion smoothing and lens array is proposed, Analyze its smooth effect and application feasibility. The results show that the nonuniformity of the focal spot reduces from 14% when the lens array is used alone to 3% after the smooth combination with the spectral dispersion. The analysis of the power spectrum of the focal spot shows that the spectral dispersion smoothing can be achieved by suppressing the spectral intensity of high frequency in the focal spot Achieve smooth results. The scheme can further improve the smoothing effect of the focal spot, and the calculation result has important reference significance for practical application.