周期性啁啾脉冲色散衍射实现近场强度匀滑

 对惯性约束聚变（ICF）激光驱动器中的周期性啁啾脉冲光谱色散后的自由空间衍射传输和近场强度匀滑特性进行了理论分析和数值模拟，并计算了色循环数对两者的影响。计算结果表明：远场光斑随色循环数增加而变大，强度调制加剧；近场强度匀滑效果随色循环数和传输距离增加而增强，但空间形状变化加剧。通过匀滑效果对比发现，基于周期性啁啾脉冲的光谱色散平滑系统的近场强度匀滑效果优于传统的正弦调频光束。

Diffraction of dispersed periodic chirp pulse for near-field-intensity smoothing

The diffraction and near-field-intensity smoothing characteristics of periodic chirp pulse after spectral dispersion in the laser driver of inertial confinement fusion are analyzed theoretically and simulated numerically, and the effect of color cycles on the both is calculated. The calculation results indicate that the far field increases and intensity modulation is enhanced with the increase of color cycle; the near-field-intensity smoothing effect becomes better but the spatial shape distortion is enhanced along with the increasing of the color cycles and propagation distance. And through smoothing effect comparison, periodic chirp pulse is found to be better than the sinusoidal phase modulated laser beam on the smoothing of near-field-intensity.