新型激光装置前端系统激光时间脉冲整形技术

New Temporary Pulse Shaping Technique of the Front-End Systemin Laser Facility

对惯性约束聚变实验而言 ,激光时间脉冲整形具有非常重要的意义。随着惯性约束聚变技术的不断发展 ,对终端脉冲的时间填充因子的要求越来越高 ,直接导致了对前端系统时间脉冲整形技术的要求也越来越高。为了满足惯性约束聚变实验对前端时间脉冲整形技术的要求 ,自行设计了“刀口器”装置。利用这一装置 ,并结合改进的时空变换脉冲整形技术 ,在“神光 Ⅱ”的升级装置上 ,实现了大功率激光装置上的激光时间脉冲整形 ,在终端得到了脉宽 1.16ns、上升沿 337ps、下降沿 36 0 ps、时间填充因子为 81.2 %的方波激光脉冲 ,满足了物理实验对前端系统激光时间脉冲整形的要求。同时 ,提出了进一步改进的措施 ,以满足今后物理实验的更高要求。

For inertial confine fusion experiment, temporary pulse shaping technique is of great significance. With the development of the ICF technology,the demand of the temporary fill rate of terminal pulse is higher and higher. To satisfy the requirement of ICF experiment,by using own-designed “knife edge” apparatus and improved temporary-space transform pulse shaping technique,the pulse shaping on “Shenguang-Ⅱ” facility is realized. In the terminator,the square laser pulse with pulse width 1.16 ns,rise time 337 ps,fall time 360 ps,temporary filling factor 81.2%,is obtained. This pulse totally satisfies the requirements of the physical experiment. At the same time,some improvement is put forward to satisfy the higher experimental requirements in the future.