高功率激光系统数字在线操控关键技术研究

Research on the Digital Online Control Technologies in the High Power Laser System

在惯性约束聚变(ICF)精确打靶中,对激光束变换、整形和控制要求苛刻,通过数字在线操控技术能够在线实现激光系统的自动校准。对数字在线操控的关键技术如非线性宽带传输、宽带放大和频率转换等模型及其算法进行详细分析。同时还对激光系统中不可或缺的辅助性技术开展了研究,具体包括基于傍轴光线追迹方程(PRTE)的光线追迹、光场的矢量衍射传输、基于迭代算法的相位恢复、光栅分析以及微纳米器件的时域有限差分(FDTD)分析等。在建模及算法分析过程中,给出了相应的模拟计算结果,并用来验证理论的正确性和算法的稳定性。

For the precise targeting in inertial confinement fusion（ICF）,the requirements for beam transformation,beam shaping and beam control are harsh.The digital control of key technologies online can realize the automatic calibration of the laser system.This paper in detail describes the key technologies,such as nonlinear broadband propagation,broadband amplification and frequency conversion.Meanwhile,other auxiliary technologies are also taken into account,including paraxial ray tracing equations（PRTEs）,vector electromagnetic field propagation,phase retrieval based on the iteration algorithm,grating analysis and finite-difference time-domain（FDTD） analysis of micrometer or nanometer devices,etc.During the derivation,some elementary examples of digital control of key technologies online are also provided which can verify the correction of the corresponding theories and the stability of the algorithm.