基于线性调频脉冲的光谱色散平滑技术实验研究

在激光驱动惯性约束聚变研究中,束靶高效耦合依赖于采用合适的束匀滑措施.目前,结合光谱色散平滑(smoothing by spectral dispersion,简称SSD)、相位板和光束叠加的技术是固体激光驱动器采用的主流束匀滑技术.瞄准间接驱动,实验研究了一套基于线性调频脉冲的SSD技术.在采用该技术后,远场色散方向上的高频调制得到了匀滑,色散后的近场也得到了匀滑.测量得到的光谱结构与理论模拟接近.该方法不需要相位调制器,而这类器件在传统SSD技术中是一个关键器件.

Experimental study on smoothing by spectral dispersion using linear frequency-modulated pulse

Precise physical experiments place strict requirements on target illumination uniformity in inertial confinement fusion research. Currently,the main stream of beam smoothing technology adopted in solid-state laser driver combines smoothing by spectral dispersion (SSD),phase plate and beam overlapping. A new smoothing method aimed at indirect-drive laser fusion is studied here,which uses linearly modulated light and angular spectral dispersion. After using this technique,high frequency modulations on the far...