Author Affiliations
Abstract
1 School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
2 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4 University of Chinese Academy of Sciences, Beijing 100049, China
The self-focusing phenomenon of partially coherent beams (PCBs) was simulated using the complex screen method combined with the split-step Fourier method to solve the nonlinear Schrödinger equation. Considering the propagation of Gaussian Schell-model beams in a nonlinear medium as an example, the suppression effects of intensity, propagation distance, and spatial coherence on small-scale self-focusing were demonstrated. Simulations of overall and small-scale self-focusing using this method were compared with the existing literature to demonstrate the validity of the method. This method can numerically analyze the degree of self-focusing in PCBs and advance the study of their nonlinearity.
partially coherent beams self-focusing nonlinearity complex screen method Gaussian Schell-model Chinese Optics Letters
2023, 21(7): 071901
中国科学院上海光学精密机械研究所高功率激光物理联合实验室，上海 201800
高功率激光装置是一个复杂的有源巨型光学工程，其性能指标要求逼近科学技术与物理极限。驱动器研制有物理设计、工程光学和结构工程设计三大过程，工程光学在其中起着重要作用。高功率激光装置工程光学设计需遵循其特有的设计原则和要点，以保证装置的高性能。根据驱动器设计指标和设计特点，从总体光学设计、光束质量控制以及光束打靶精度控制方面，综述了高功率激光装置工程光学设计中的关键科学技术问题以及相应解决方法，为未来高功率激光驱动器的发展提供必要的工程设计参考。
光学设计 惯性约束聚变 神光装置 工程光学 激光光学
1 中国科学院上海光学精密机械研究所高功率激光物理联合实验室，上海 201800
2 上海科技大学物质科学与技术学院，上海 201210
3 中国科学技术大学物理学院，安徽 合肥 230026
研究了当激光增益介质存在热效应时，腔长变化对4F简并激光腔最大横模阶数及光谱结构的影响。计算和实验结果表明，当简并腔中存在热效应时，腔长偏离理想位置会引起横模拍频带宽变宽，输出光谱的精细结构发生变化；同时腔中光阑位置处的基模半径随之变大，最大横模阶数减小，光场空间相干性增大。进一步分析发现，最大横模阶数对激光腔长非常敏感，腔镜与理想位置的微小距离会导致最大横模阶数的显著减少。通过在腔内加入负透镜或者将增益介质端面加工成曲面并对热效应进行补偿，可以增加腔内模式数量，这有利于降低激光光场的空间相干性。
激光器 空间低相干 简并腔 热效应 中国激光
2022, 49(24): 2401002
