摘要
随着能量输出能力的不断提升,高功率激光驱动器运行对光学元件的性能和打靶光束的质量都有了更高要求。传统测量仪器结构复杂、精度有限,难以满足实验需求。朱健强课题组将计算成像技术引入到高功率激光驱动器的参数测量中,精确测量大口径光学元件的形貌、应力分布、热畸变等特征,脉冲光束的时间、空间、近远场分布等参量,以及激光与物质相互作用的过程;进一步发展相干衍射成像(CDI)技术,开发出单次曝光三维PIE(ptychography iterative engine)技术、多模态相干调制成像(CMI)技术、分束编码成像技术等,建立了相干衍射成像技术的解析模型,在数学上分析了CDI技术解的唯一性。本文主要综述了课题组在惯性约束聚变中计算光学成像技术应用方面的研究进展。
Significance As an important frontier issue,inertial confinement fusion(ICF)has been concerned by researchers for a long time.Because of its strategic significance in national defense security and energy security,major countries in the world have invested a lot of resources to carry out research on ICF,and the most representative high-power laser drivers include the National Ignition Facility(NIF)in the United States,the Laser MegaJoule(LMJ)in France,and the Shen Guang series(SG)laser device in China.In December 2022,NIF provided energy up to 2.05 MJ in the form of laser pulses to the target,generating a recordbreaking energy output of 3.15 MJ.It was a milestone event in ICF research that for the first time more energy was produced from the self-sustaining fusion reaction than the energy put into it.A series of experimental data indicate that a key breakthrough has been made in the ICF research,and the improvement of the output efficiency of the device requires further improvement in laser energy and irradiation uniformity,which is essentially an improvement in beam quality(Fig.1).Since 2010,our group has paid attention to the influence of beam quality on the output performance of high power laser drivers.Many factors such as material purity,density uniformity,machining accuracy,installation and calibration process,thermal distortion,and use environment of optical components will affect beam quality.It was demonstrated that uneven beam energy distribution would induce nonlinear effects which makes damage to the optical elements and results in further degradation of the beam quality.Therefore,precise optical measurement methods are needed to timely discover the beam degradation characteristics and improve the beam quality with appropriate optical compensation means(Fig.2).Optical elements are generally measured by interferometers.Zygo interferometer is mature and highly instrumented,which can accurately measure large aperture optical elements.However,a large aperture interferometer demands large space and a high p
作者
昌成成
潘良泽
徐英明
吴丽青
陶华
刘登
陈飞
刘诚
朱健强
Chang Chengcheng;Pan Liangze;Xu Yingming;Wu Liqing;Tao Hua;Liu Deng;Chen Fei;Liu Cheng;Zhu Jianqiang(Key Laboratory of High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;National Laboratory on High Power Laser and Physics,China Academy of Engineering Physics,Chinese Academy of Sciences,Shanghai 201800,China;A Center of Equipment Development Department,Beijing 100034,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第22期1-33,共33页
Acta Optica Sinica
基金
国家自然科学基金(61827816)。
关键词
计算成像
相位测量
激光束表征
激光放大器
computational imaging
phase measurement
laser beam characterization
laser amplifiers
