多模光纤激光靶面辐照匀滑特性研究

研究了基于光纤放大网络的激光惯性约束核聚变的靶面光场的均匀特性，采用透镜阵列匀滑多束多模光纤激光器集束后的光场，设计了合适的透镜阵列并进行相应的实验，获得聚焦后靶面处的极小光斑，其靶面光场顶部区域RMS(Root Mean Square)低于5%。同时实验上研究了靶面位置和集束激光器数目对匀滑效果的影响，合适的靶面位置和增加集束激光器数目能明显的改善匀滑效果。

Smoothness of target plane radiation coming out from multi-mode fiber laser

The study investigated the smoothness of the optical field on the target surface in the laser inertial confinement fusion based on fiber amplification network. The lens array was used to smooth the optical field generated by multi-beam multi-mode fiber laser after beam combining. The corresponding experiment was conducted with proper lens array. As a result, a small focused light spot was obtained on the target surface, with RMS less than 5% on the top region of the optical field. The experiment also studied how the target surface position and the number of beam combining lasers affected the smoothness of final optical field. Proper target surface position and the increased number of beam combining lasers obviously improved the smoothness.