含噪声调制的高能短脉冲激光传输效应分析方法研究

项目名称： 含噪声调制的高能短脉冲激光传输效应分析方法研究

项目编号： No.11275166

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 李晓彤

作者单位： 浙江大学

项目金额： 60万元

中文摘要： 高能短脉冲激光系统光路复杂，光束通过系统传播时会受到多种空间噪声的调制作用，包括由于杂光聚焦而叠加干涉，产生自聚焦等非线性效应。本项目采用物理光学、非线性光学与光线光学相结合的方法，研究系统中传播的主光束、噪声光及其与介质的相互作用机理和表示，研究适用于实际光学系统、便于计算和输出处理的具有多重调制的高能短脉冲激光传输效应的分析方法，通过动态波法线取样和哈密顿光线追迹创建能保存全部中间结果的按时间差分的有向图数据结构，根据多程放大系统的空间排布，研究实际非傍轴光束在有像差和加工误差的光学系统传输过程中受到的多次反射与衍射杂光的调制作用、色散、增益和自聚焦效应、不同频率激光在非线性介质中共存的混频效应等，获取系统中给定时间和空间范围内的功率密度分布，找到能量集中位置并通过回溯处理找到主要的能量来源，有利于系统在设计阶段考虑稳定运行采取相应的措施，为从源头上保证激光脉冲的质量提供依据。

中文关键词： 光线追迹；高能激光；脉冲激光；非线性；杂光

英文摘要： The optical system of high power short pulse laser is composed of multiple optical components. When input laser beam transmits in the system it will be modified by different spatial noise including superposition interference caused by stray light focusing and nonlinear self-focusing effects. In this project our research will focus on the intercoupling mechanics and description of main beam, noise beam and optical medium using the method of physical optics, geometrical optics, nonlinear optics and their combination. A novel analysis algorithm that adapts to real high power short pulse laser systems with multiple modulations and is convenient to calculation and output will be presented. Dynamic wave normal samples will be Hamiltonian traced to build the data structure of directed graph including all intermediate results using the time differencing method. According the spatial arrangement of multipass amplifier, the transmission effects of real non-paraxial laser pulse modified by multi-reflection and multi-order diffraction, dispersion, amplification, self-focusing and frequency mixing in optical systems with aberrations and manufacturing errors will be explored, then we will obtain the energy density distributions in the systems in given time and space, find the positions with concentrated energy and the energy

英文关键词： ray trace；high power laser；pulse laser；nonlinear；stray light