强激光与粒子束
2024, 36(4): 043007
1 同济大学 物理科学与工程学院 精密光学工程技术研究所,上海 200092
2 同济大学 先进微结构材料教育部重点实验室,上海 200092
3 中国工程物理研究院 激光聚变研究中心,绵阳 621900
提出了一种采用球面弯晶聚焦结构获得高亮度桌面型单能X射线的方法。在子午方向利用晶体色散实现单能、在弧矢方向通过球面镜聚焦提高光强。理论建模和光学仿真评估了该结构的色散和聚焦性能,验证了球面弯晶聚焦结构相对于柱面弯晶在聚焦特性上的显著优势。针对Al靶Kα1线单能需求,设计和装调了基于低功率Al靶X射线管的单能装置,并实验验证了其性能。结果显示,当X射线管工作在7 W功率条件下,CCD曝光10 min,Al靶Kα1线全视场光谱的探测器计数大于2×105,能谱展宽约为0.592 eV;引入200 μm限束光阑,能谱展宽进一步减小至0.493 eV,探测器计数约为2×104。研究结果证实了该装置可以有效获得高亮度Al靶Kα1谱线,也为精确测量光学器件和系统的光谱特性提供了一种新的获得高亮度单能X射线的技术途径。
球面弯晶聚焦 高亮度 高单能性 桌面型 X射线源 Spherical bent-crystal focusing structure High intensity High monochromaticity Desktop X-ray source
Author Affiliations
Abstract
1 School of Physics Science and Engineering, Tongji University, Shanghai, China
2 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
3 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China
4 XIOPM Center for Attosecond Science and Technology, State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China
The development of high-intensity ultrafast laser facilities provides the possibility to create novel physical phenomena and matter states. The timing fluctuation of the laser pulses is crucial for pump–probe experiments, which is one of the vital means to observe the ultrafast dynamics driven by intense laser pulses. In this paper, we demonstrate the timing fluctuation characterization and control of the front end of a 100-PW laser that is composed of a high-contrast optical parametric amplifier (seed) and a 200-TW optical parametric chirped pulse amplifier (preamplifier). By combining the timing jitter measurement with a feedback system, the laser seed and preamplifier are synchronized to the reference with timing fluctuations of 1.82 and 4.48 fs, respectively. The timing system will be a key prerequisite for the stable operation of 100-PW laser facilities and provide the basis for potential pump–probe experiments performed on the laser.
feedback control high-intensity ultrafast laser timing fluctuation High Power Laser Science and Engineering
2023, 11(4): 04000e52
Author Affiliations
Abstract
1 Technische Universität Darmstadt, Darmstadt, Germany
2 GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
3 Laboratoire pour l’Utilisation des Lasers Intenses, CNRS, Ecole Polytechnique, Palaiseau, France
4 Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
5 Technische Universität Dresden, Dresden, Germany
6 Helmholtz-Institut Jena, Jena, Germany
We report on the development of an ultrafast optical parametric amplifier front-end for the Petawatt High Energy Laser for heavy Ion eXperiments (PHELIX) and the Petawatt ENergy-Efficient Laser for Optical Plasma Experiments (PEnELOPE) facilities. This front-end delivers broadband and stable amplification up to 1 mJ per pulse while maintaining a high beam quality. Its implementation at PHELIX allowed one to bypass the front-end amplifier, which is known to be a source of pre-pulses. With the bypass, an amplified spontaneous emission contrast of $4.9\times {10}^{-13}$ and a pre-pulse contrast of $6.2\times {10}^{-11}$ could be realized. Due to its high stability, high beam quality and its versatile pump amplifier, the system offers an alternative for high-gain regenerative amplifiers in the front-end of various laser systems.
high-intensity laser temporal laser contrast ultrafast optical parametric amplification High Power Laser Science and Engineering
2023, 11(4): 04000e48
中国计量科学研究院力学与声学计量科学研究所,北京 100029
针对激光干涉法高强度聚焦超声(HIFU)声压测量中干涉系统带宽解算依赖线性声场条件,导致解算结果与实际有较大差异的问题,首先通过理论分析,建立了HIFU声压测量中干涉信号的数理模型;针对非线性声场条件下干涉信号无法进行函数展开的情况,利用数值仿真的方法对干涉信号的频域进行分析;通过对比具有相同声压峰峰值和基频的线性和非线性声场条件下的干涉信号频谱,发现了非线性声场对激光干涉信号带宽的展宽作用,证明了现有线性声场条件下干涉系统带宽的估算方法不适用于HIFU声压测量;利用实测HIFU声压数据,通过仿真分析,发现在非线性声场条件下,激光干涉系统带宽随被测声压峰峰值呈二次方规律变化,而不是线性声场条件下的线性变化规律。
测量 高强度聚焦超声 声压测量 激光干涉系统带宽 非线性声场 中国激光
2023, 50(13): 1304002
强激光与粒子束
2023, 35(3): 033005
强激光与粒子束
2023, 35(1): 012012
强激光与粒子束
2023, 35(1): 012010
1 河北工业大学 先进激光技术研究中心,天津
2 河北省先进激光技术与装备重点实验室,天津
3 中国电子科技集团公司光电研究院,天津
4 哈尔滨工业大学 航天学院可调谐(气体)激光技术国家重点实验室,哈尔滨
拍瓦激光装置在粒子加速、二次粒子源产生、惯性约束聚变和放射治疗等特定研究领域体现出重大应用价值。截止2020年,全球范围超过100台超快超强拍瓦激光装置已经建成和正在建设中。为了更好地推进超快激光科学及应用的发展,充分向科研人员开放这些大型激光装置的使用权限并提供技术支持,拍瓦激光装置按照地域被划分在不同的运营组织进行管理,主要分布在北美、欧洲和亚洲等地区。将以世界上强激光科教组织机构为线索,对紧凑型拍瓦级高强度短脉冲激光装置的技术路线、激光参数和相关技术的最新情况展开综述。
拍瓦激光器 高强度短脉冲 高平均功率泵浦 petawatt laser high intensity ultrashort laser high average power pump
1 广东药科大学健康学院,广州 510310
2 广东省光与健康工程技术研究中心,广州 510310
光子疗法因具有安全、无创、无痛、非侵入、无致瘾和操作方便且疗效显著等特点,已被广泛地应用于疼痛疾病的临床治疗中。本文介绍了基于光子技术的低强度激光疗法、高能量激光疗法、半导体激光疗法以及激光针灸疗法在疼痛缓解方面的研究进展,通过研究疼痛缓解的机制和临床实践手段,为光子技术全面应用于疼痛临床治疗提供理论依据和实践指导。
光子 低强度激光 高能量激光 半导体激光 疼痛 photon low-level laser high-intensity laser semiconductor laser pain