红外与激光工程
2020, 49(12): 20201074
强激光与粒子束
2020, 32(11): 112009
强激光与粒子束
2020, 32(11): 112006
强激光与粒子束
2020, 32(1): 011004
Author Affiliations
Abstract
1 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
Lens-less Fourier-transform holography has been actively studied because of its simple optical structure and its single-shot recording. However, a low-contrast interferogram between the reference and object waves limits its signal to noise ratio. Here, multi-reference lens-less Fourier-transform holography with a Greek-ladder sieve array is proposed in the experiment and demonstrated effectively to improve the signal to noise ratio. The key technique in our proposed method is a Greek-ladder sieve array, which acts as not only a wave-front modulator but also a beam splitter. With advantages of the common path, single shot, and no need for a lens, this system has enormous potential in imaging and especially in extreme ultraviolet and soft X-ray holography.
digital holography diffractive lens X-ray imaging Chinese Optics Letters
2020, 18(2): 020901
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 中国工程物理研究院上海激光等离子体研究所, 上海 201800
重复频率激光放大器是实现重复频率激光器的关键器件,其重复频率取决于对抽运及放大过程中产生热量的有效控制。针对千焦耳量级输出重复频率激光器的需求,通过合理的结构设计、冷却液选型及测试等,研制出一台基于氙灯抽运、钕玻璃增益介质、液体冷却、通光直径为Φ130 mm的激光放大器样机。测试结果表明,该放大器样机可实现每分钟一次的重复频率运行,同时具备双程1.3189倍净增益,双程动态波前PV(peak to valley)平均值为0.2718波长(λ)(20 ℃,λ=1053 nm,10发次计)和0.3223λ(30 ℃,λ=1053 nm,10发次计)。
激光器 重复频率激光放大器 液体冷却 氙灯抽运 钕玻璃 中国激光
2019, 46(10): 1001007
Author Affiliations
Abstract
1 Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
2 Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
4 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
The spatial resolved method, which measures the laser-induced damage fluence by identifying the location of the damage point in the Gaussian beam three-dimensional direction, is demonstrated. The advantages and practicality of this method have been explained. Taking a triple frequency beam splitter as an example, the defect damage fluence can be accurately calculated by the spatial resolved method. The different defect damage performance of the triple frequency splitter is distinguished under irradiations of only the 355 and 532 nm lasers. The spatial resolved method provides a way to obtain precise information of optical film defect information.
140.3330 Laser damage 140.3295 Laser beam characterization Chinese Optics Letters
2019, 17(3): 031403
1 高功率激光物理联合实验室, 上海 201800
2 中国科学院上海光学精密机械研究所, 上海 201800
3 中国工程物理研究院上海激光等离子体研究所, 上海 201800
神光Ⅱ大型固体高功率激光装置是我国激光驱动器发展历史的里程碑, 其成功研制使我国高功率固体激光工程与技术、聚变物理与基础物理研究实现了全面且本质的跨越式发展。简要概述了神光Ⅱ激光装置研制中创新发展的大量工程方案与技术手段, 举例介绍了神光Ⅱ激光装置在近20年来的高质量运行中取得的众多有国际影响力的研究成果。经多方支持和多年持续发展, 已经形成数万焦耳级纳秒激光装置、皮秒拍瓦以及飞秒拍瓦激光装置等, 这些装置是我国惯性约束核聚变、强场物理、高能量密度物理等研究领域中重要的物理实验核心平台之一。
激光技术 惯性约束核聚变 固体激光驱动器 聚变点火 高功率激光
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 中国工程物理研究院上海激光等离子体研究所, 上海 201800
高功率片状放大器在线运行时氙灯辐照导致片腔内产生大量气溶胶,易引起钕玻璃污染,影响其使用寿命。采用洁净氮气吹扫恢复片腔内的洁净环境是片状放大器在线运行时的主要洁净手段。研究了氮气吹扫过程中片腔内涡流对洁净度的影响,结果显示涡流对气溶胶颗粒的禁锢作用会导致腔内气溶胶颗粒的大量残留,且无法通过延长吹扫时间或调整吹扫流速加以解决。针对这一问题,提出了间断多次氮气吹扫对腔内气溶胶进行循环稀释的在线洁净控制方法,该方法使腔内涡流经历不断破坏和重建过程,涡流场内滞留的气溶胶颗粒含量也得到不断稀释,从而大幅提高片腔洁净度。针对Φ130 mm单口径片状放大器进行了对比实验研究。采用间断吹扫法之后,腔内残留气溶胶颗粒为连续吹扫时的1/100,片腔洁净度在15 h的观测时间内始终保持在40级以内。该方法普适有效,为避免片状放大器钕玻璃气溶胶污染,增加其在线使用寿命提供了重要参考。
激光光学 片状放大器 在线洁净 气溶胶 间断多次吹扫 涡流
Author Affiliations
Abstract
1 中国科学院上海光学精密机械研究所高功率与物理联合实验室, 上海 201800
2 中国工程物理研究院上海激光等离子体研究所, 上海 201800
An all-fiber Faraday rotator isolation rate measurement system is designed and realized. The system has tremendous advantage for large aperture Faraday isolator on-line measurement due to its flexible alignment and more compaction. Employing the method of relative transmission measurement and transmissions contrasting between static and operating states, single-shot isolation-rate measurement is achieved. The available measurement range larger than 33 dB is demonstrated experimentally. And the potential to get measurement range larger than 50 dB by adjusting the coupling rate of the fiber couplers is affirmed. Measurement accuracy of 2.2%of PV value is achieved even while keeping the input pulse energy and polarization in random vibration, which illustrates that the influence of the input pulse energy and polarization vibration on the measurement accuracy is eliminated.
测量 大口径磁光隔离器 隔离度 单次测量 全光纤化 在线测量 measurement large-aperture Faraday rotator isolation-rate single-shot measurement all-fiber on-line measurement Collection Of theses on high power laser and plasma physics
2016, 14(1): 1204001