甚多束高功率激光精密聚焦调控技术

项目名称： 甚多束高功率激光精密聚焦调控技术

项目编号： No.11204327

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 缪洁

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 26万元

中文摘要： 快点火作为一种新的聚变点火方式，有望在激光惯性约束聚变工程中得到重要应用。实际应用中要求八束激光合成的远场焦斑50%的能量集中于40微米内，物理边界条件要求苛刻。特别是2012年度以来，美国国家点火工程试验不断报道出更高的物理极限需求，这就需要对每一束激光自身的波前进行严格控制的同时，还要对光束之间的位相差进行精确控制。 围绕高功率激光束间相位误差精密调控这一国际前沿研究方向，本课题提出了短脉冲束间相位误差四通道移相实时干涉测量方法；基于高功率激光近场波前的动态畸变特征，探索性发展束间自适应相位补偿评估标准与反馈控制算法；针对同一束组内不同光束间相位差对远场焦斑的影响分析，发展精密聚焦调控技术与闭环反馈实验演示系统。该研究有望为甚多束高功率激光精确聚焦及其灵活调控提供关键技术路线与核心算法。

中文关键词： 高功率激光；束间相位；干涉测量；精密调控；反馈控制

英文摘要： As a new fusion ignition program, the Fast Ignition is expected to play an important role in the inertial confusion projects. In practical application, 50% energy of the combined 8-beam far field focal spot is required to be concentrated in less than 40 micrometers, and the physical boundary conditions are demanding. Especially since 2012, more physical extreme demands are reported by American. This requires not only the strict control of wavefront of each beam, but also the precise control of the phase differences between beams at the same time. Around such international frontier research field on precise control of the phase error between high power laser beams, the interference method is proposed in this item to measure the phase error between beams, and exploring development on adaptive phase compensation evaluation criteria between beams as well as the feedback controlling algorithm are also proposed, based on the characteristics of the dynamic distortion of high power laser near field wavefront. What's more, demonstration system of closed-loop feedback experiments and precisely focusing controlling technology is wished to be developed to realize the influence analysis of far field focal spot because of the phase differences among various beams in the same bunch. This study is expected to provide key techno

英文关键词： high power laser；phase between beams；interferometry；precise control；feedback control