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
丁永超 1,2,3,4,5王德恩 6伦宝利 1,3,4,5王传军 1,2,3,4,5[ ... ]常亮 1,3,4,5,*
1 中国科学院云南天文台, 云南 昆明 650216
2 中国科学院大学, 北京 100049
3 中国科学院天体结构与演化重点实验室, 云南 昆明 650216
4 中国科学院天文大科学研究中心, 北京 100012
5 云南省应用天文技术工程实验室, 云南 昆明 650216
6 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
7 北京北方光电有限公司, 北京 100089
为了获得更高质量的观测数据，提高望远镜的工作效率，设计了一套基于倾斜镜校正系统的原理样机，用于提高丽江2.4 m望远镜的闭环跟踪精度。介绍了原理样机的研制，并在2.4 m望远镜上进行了实际测试。结果表明：该系统能实现245 Hz的校正频率，望远镜的闭环跟踪精度提高了7.3倍，其高色散光谱仪的星光耦合效率提高了28.6%，快速测光系统的成像质量得到了明显改善；利用该系统可以满足对天文观测的要求。
成像系统 2.4米望远镜 跟踪精度 倾斜校正 大气湍流 激光与光电子学进展
2018, 55(7): 071104
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
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 62190003
双脉冲双向传输放大构型是一种在惯性约束聚变激光驱动器领域具有极大应用价值的新型多程放大技术。针对变形镜代替腔镜对双向传输放大构型两束脉冲波前畸变进行补偿的问题, 通过将两束脉冲波前先拼接再补偿的方法, 研究出了一种基于双变形镜双哈特曼-夏克传感器耦合控制的新型波前校正技术, 并利用神光-Ⅲ主机装置的实测数据进行了模拟验证。结果表明, 该技术能够有效控制两束激光传输放大过程中所引入的波前畸变, 满足系统对空间滤波器过孔的要求。
自适应光学 高功率激光 双脉冲双向传输放大构型 波前校正 adaptive optics high-power laser two-pulse bidirectional propagating amplification wavefront correction
中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
双脉冲双向传输放大构型可对两束激光脉冲沿主放大器空间对称的两个方向同时进行传输放大，有效增加了放大器的储能提取率，在惯性约束聚变激光驱动器领域具有很大的应用价值。通过建立等效光路，推导了两束激光脉冲在传输放大时波前畸变的叠加过程，并对神光-Ⅲ主机装置中的实测数据进行了数值模拟。结果表明,双向传输放大构型下两束激光脉冲的波前面形存在一定差异，波前像差集中在低频段，且三、四程放大时空间滤波器小孔处的激光脉冲和输出激光脉冲的波前畸变较大。为保证输出光束质量和光束通过空间滤波器小孔，必须对主放大器内的波前像差进行补偿控制。这些结论将为双脉冲双向传输放大构型的波前控制方案的设计提供理论指导。
激光光学 高功率激光 波前特性 数值模拟 双脉冲双向传输放大构型 多程放大
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
SG-III laser facility is now the largest laser driver for inertial confinement fusion research in China. The whole laser facility can deliver 180 kJ energy and 60 TW power ultraviolet laser onto target, with power balance better than 10%. We review the laser system and introduce the SG-III laser performance here.
inertial confinement fusion inertial confinement fusion laser driver laser driver SG-III SG-III High Power Laser Science and Engineering
2016, 4(3): 03000e21
Author Affiliations
Abstract
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Optics surface phase defects induced intensity modulation in high-power laser facility for inertial confinement fusion research is studied. Calculations and experiments reveal an exact mapping of the modulation patterns and the optics damage spot distributions from the surface phase defects. Origins are discussed during the processes of optics manufacturing and diagnostics, revealing potential improvements for future optics manufacturing techniques and diagnostic index, which is meaningful for fusion level laser facility construction and its operation safety.
intensity modulation intensity modulation optics damage optics damage phase defect phase defect High Power Laser Science and Engineering
2016, 4(1): 010000e6
中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
强激光与粒子束
2016, 28(1): 019901
Author Affiliations
Abstract
1 Shandong Institute of Spacecraft Electrical Technology, Yantai 264670, China
2 Laser Fusion Research Center, China Academic of Engineering Physics, Mianyang 621900, China
In this Letter, temporal self-modifying behavior of amplitude modulation pulse propagation characteristics in multiphoton absorbers is presented by solving the underlying theoretical model coupling the propagation equation with the rate equations. The characteristics of the output temporal shapes are of primary concern and are discussed in detail. Amplitude modulation suppressing effects of multiphoton absorbers are numerically demonstrated; they have not been reported previously, to our knowledge. By taking a time resolved absorption coefficients, the corresponding physical mechanism is explicitly interpreted.
190.4710 Optical nonlinearities in organic materials 140.3300 Laser beam shaping Chinese Optics Letters
2015, 13(7): 070009
1 中国工程物理研究院激光聚变研究中心，四川 绵阳 621900
2 中国工程物理研究院研究生部，北京 100088
小尺度自聚焦是威胁强激光装置安全运行的重要因素，需确定装置激光束发生小尺度自聚焦的临界点，以指导装置的安全运行。提出利用输出光束近场强度熵值变化来反映激光束小尺度自聚焦发展过程的方法，通过数值模拟研究了小尺度自聚焦发展过程中的近场强度熵值变化规律，利用此规律给出了强激光装置中发生显著小尺度自聚焦的近场强度熵值预警方法。通过与光束近场调制度及对比度方法的对比分析，发现该方法对小尺度自聚焦发生的表征更明显。
物理光学 小尺度自聚焦 图像熵 强激光 光学学报
2015, 35(s2): s226001
