1 中山光子科学中心,广东 中山 528400
2 中国工程物理研究院激光聚变研究中心,四川 绵阳 621900
超短超强脉冲激光是目前世界上在实验室内产生超高能量密度、超强电磁场和超快时间尺度的综合性极端物理条件的重要手段。在对超短超强脉冲激光发展现状和趋势分析的基础上,针对高能量密度物理等前沿基础科学实验研究多样化的需求,提出研制不同脉冲宽度、三种脉冲激光(两束输出功率为10 PW的飞秒激光、单束输出功率为1 PW@1 Hz的飞秒激光、单束千焦耳皮秒激光和单束万焦耳纳秒激光)协同输出至4个物理实验站形成不同工作模式,实现多种加载-诊断物理实验功能的星光超强激光装置(XG-ELF)的设想。对XG-ELF装置的物理实验设想和主要设计结果进行介绍。建成后的XG-ELF装置将为我国高能量密度物理前沿基础领域中的研究提供先进的研究平台。
激光器 极端条件 高能量密度物理 超短超强激光 光参量啁啾脉冲放大 光学学报
2022, 42(17): 1714001
中国工程物理研究院激光聚变研究中心,绵阳 621900
等离子体电极普克尔盒(PEPC)用作多程放大控制、自激振荡抑制以及反激光隔离,是大型高功率固体激光器的核心器件。本文从高功率固体激光器的发展对光开关提出的要求出发,系统地综述了等离子体电极普克尔盒的性能特点以及研究进展。重点介绍了中国工程物理研究院激光聚变研究中心近年来在PEPC研究方面所取得的进展,包括单脉冲驱动的组合口径PEPC、低损耗PEPC以及重复频率运转的PEPC。
高功率激光 普克尔盒 电光晶体 等离子体 重复频率 热效应 high power laser Pockels cell electro-optic crystal plasma repetition rate thermo-effect
Author Affiliations
Abstract
1 Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing100084, China
2 State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing100084, China
3 Research Center of Laser Fusion, CAEP, Mianyang621900, China
4 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu610209, China
A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics (AO) controlled off-axis multi-pass amplification laser system. Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier, a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62% conversion efficiency, 1178 J and beam quality of 7.93 times the diffraction limit (DL). By using a complete closed-loop AO configuration, the static and dynamic wavefront distortions of the laser system are measured and compensated. After correction, the diameter of the circle enclosing 80% energy is improved remarkably from 7.93DL to 1.29DL. The focal spot is highly concentrated and the 1178 J, 527 nm near diffraction limited laser is achieved.
kilojoule near diffraction limit 527?nm X-ray High Power Laser Science and Engineering
2021, 9(2): 02000e22
强激光与粒子束
2020, 32(12): 121007
强激光与粒子束
2020, 32(1): 011008
Author Affiliations
Abstract
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
FM-to-AM (frequency modulation-to-amplitude modulation) conversion caused by nonuniform spectral transmission of broadband beam is harmful to high-power laser facility. Smoothing by spectral dispersion (SSD) beam is a special broadband beam for its monochromatic feature at the given time and space on the near field. The traditional method which uses the optical spectral transfer function as filters cannot accurately describe its AM characteristics. This paper presents the theoretical analysis of the etalon effect for SSD beam. With a low-order approximation, the analytic model of the temporal shape of SSD beam is obtained for the first time, which gives the detailed AM characteristics at local and integral aspects, such as the variation of ripples width and amplitude in general situation. We also analyze the FM-to-AM conversion on the focal plane; in the focusing process, the lens simply acts as an integrator to smooth the AM of SSD beam. Because AM control is necessary for the near field to avoid optics damage and for the far field to ensure an optimal interaction of laser–target, our investigations could provide some important phenomena and rules for pulse shape control.
amplitude modulation etalon effect frequency modulation high-power laser smoothing by spectral dispersion High Power Laser Science and Engineering
2019, 7(2): 02000e21
1 中国工程物理研究院, 四川 绵阳 621999
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621999
巨型高峰值功率激光装置的总体规模与性能是一个国家在强激光技术研究与应用领域综合实力的集中体现。简要介绍了装置基本结构、关键科学技术与工程问题以及总体设计要素, 回顾了两台中国二代巨型高峰值功率激光装置的基本状态与技术特点, 展望了未来中国高峰值功率激光技术与工程发展的基本趋势。
激光技术 惯性约束聚变 高能量密度物理 原型装置 主机装置 兆焦耳级聚变科学激光装置
1 重庆电子工程职业学院机械工程系, 重庆 401331
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
根据放大器下装光机模块的接口尺寸分析了应用于特定环境下的升降平台的结构设计要求,采用等强度悬臂梁理论构建了升降平台的力学计算模型,推导了变截面平台结构的刚度公式并以此计算了升降平台的主要结构参数。运用ANSYS软件构建了升降平台的三维模型并开展了结构力学分析,分析结果验证了理论设计参数的合理性。在提高安全系数的前提下运用ANSYS软件重构了平台三维模型并进行了平台刚度冗余情况分析。以平台质量最轻为主要目标,采用ANSYS软件的全域寻优工具对升降平台的结构参数进行了优化,并将优化结果应用于某系统的垂直举升机构样件制作。
激光器 放大器 光机模块 升降平台 等强度梁 下装 设计优化 激光与光电子学进展
2018, 55(5): 051408
Author Affiliations
Abstract
Research Center of Laser Fusion of China Academy of Engineering Physics, 919-988 mail-box, Mianyang, SiChuan, 621900, PR China
In indirect drive, reducing peak intensity of a single beam and controlling overlap of multi-beams are two opposite requirements for laser focal spot design. In this paper, an improved laser spot design technique for indirect drive built upon the geometric structures of laser propagation into hohlraum has been introduced. The proposed technique is able to generate appropriate continuous phase plate (CPP) producing a special shaped spot that can balance the opposite requirements. The corresponding CPP does not bring difficulties to the design and fabrication. Phase aberrations are more sensitive to the special shaped spot; however, it can be tolerable for the current beam control level.
beam aberration CPP focal spot optimization ICF Laser systems High Power Laser Science and Engineering
2017, 5(3): 03000e20
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, P.O. Box 919-988, Mianyang, 621900, China
2 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai, 200240, China
The SG-Ⅲ laser facility (SG-Ⅲ) is the largest laser driver for inertial confinement fusion (ICF) researches in China, which has 48 beamlines and can deliver 180 kJ ultraviolet laser energy in 3 ns. In order to meet the requirements of precise physics experiments, some new functionalities need to be added to SG-Ⅲ and some intrinsic laser performances need upgrade. So at the end of SG-Ⅲ's engineering construction, the 2-year laser performance upgrade project started. This paper will introduce the newly added functionalities and the latest laser performance of SG-Ⅲ. With these function extensions and performance upgrade, SG-Ⅲ is now fully prepared for precise ICF experiments and solidly paves the way towards fusion ignition.
Inertial confinement fusion Inertial confinement fusion Laser driver Laser driver SG-III SG-III Power balance Power balance Beam smoothing Beam smoothing Matter and Radiation at Extremes
2017, 2(5): 243