强激光与粒子束, 2011, 23 (3): 697, 网络出版: 2011-04-01
用于快点火的激光驱动器组束方式
Laser driver beam combination for fast ignition
快点火 非相干组束 相干组束 波前误差 功率密度 fast ignition non-coherent combination coherent combination wavefront error power intensity
摘要
根据实现快点火激光的预估参数要求,分析了非相干组束和相干组束是否可满足快点火所需的激光功率密度和能量。引入与实际情况相当的畸变波前分析远场焦斑,为了满足能量要求非相干组束需要组合更多的光束,并改进驱动器的稳定性将角漂控制在±2 μrad范围内;相干组束可获得更小的焦斑有利于提高功率密度,同时可降低对能量的要求,但仅对单路光分别进行波前补偿并不能提高能量集中度,需要引入复杂的监测和控制设备对整个通光孔径内的波前(包括束内和束间)进行全局控制。基于目前提出的参数要求和波前校正能力,非相干合成更易实现快点火,但相干合成则具有更广泛的应用潜力。
Abstract
Based on the estimated parameters of fast ignition, the requirements for laser-beam power intensity and energy are used to analyze the possibility of realizing fast ignition by coherent combination and non-coherent combination. The practical distorted wavefront is considered to analyze the far-field focal spot. Non-coherent combination needs more beams for energy requirement and to limit angle drifting in ±2 μrad through improving laser driver’s stability. Coherent combination is beneficial for achieving smaller focal spot and higher power intensity, simultaneously reducing the requirement of energy, but single beam wavefront correction can not improve the power intensity in this method, which leads to combined wavefront correction of the total clear aperture with complex monitoring and control methods. Based on the requirement of parameters and wavefront correction capability, non-coherent beam combination is easier to achieve for fast ignition, however, coherent beam combination has the potential for extensive application.
杨雨川, 景峰, 李富全, 王逍, 黄小军, 冯斌, 罗晖. 用于快点火的激光驱动器组束方式[J]. 强激光与粒子束, 2011, 23(3): 697. Yang Yuchuan, Jing Feng, Li Fuquan, Wang Xiao, Huang Xiaojun, Feng Bin, Luo Hui. Laser driver beam combination for fast ignition[J]. High Power Laser and Particle Beams, 2011, 23(3): 697.