强激光与粒子束
2023, 35(6): 062002
强激光与粒子束
2023, 35(6): 062001
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
2 Graduate School of China Academy of Engineering Physics, Beijing 100193, China
3 Key Laboratory of Optical Fiber Sensing and Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
Matter and Radiation at Extremes
2023, 8(2): 029901
Author Affiliations
Abstract
1 Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
2 Graduate School of China Academy of Engineering Physics, Beijing 100193, China
3 Key Laboratory of Optical Fiber Sensing and Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
Broadband low-coherence light is considered to be an effective way to suppress laser plasma instability. Recent studies have demonstrated the ability of low-coherence laser facilities to reduce back-scattering during beam–target coupling. However, to ensure simultaneous low coherence and high energy, complex spectral modulation methods and amplification routes have to be adopted. In this work, we propose the use of a random fiber laser (RFL) as the seed source. The spectral features of this RFL can be carefully tailored to provide a good match with the gain characteristics of the laser amplification medium, thus enabling efficient amplification while maintaining low coherence. First, a theoretical model is constructed to give a comprehensive description of the output characteristics of the spectrum-tailored RFL, after which the designed RFL is experimentally realized as a seed source. Through precise pulse shaping and efficient regenerative amplification, a shaped random laser pulse output of 28 mJ is obtained, which is the first random laser system with megawatt-class peak power that is able to achieve low coherence and efficient spectrum-conformal regenerative amplification.
Matter and Radiation at Extremes
2023, 8(2): 025902
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
2023, 35(2): 029901
强激光与粒子束
2022, 34(3): 031011
强激光与粒子束
2021, 33(9): 091004
1 西南科技大学 中国工程物理研究院激光聚变研究中心 极端条件物质特性联合实验室, 四川 绵阳 621010
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
基于Mie理论和热传导方程, 结合ICP-OES对熔石英亚表面杂质粒子的主要成分测量, 建立了计算吸收性杂质粒子诱导熔石英光学元件表面损伤概率的模型。通过该模型理论研究了不同种类的杂质粒子诱导损伤所需的临界能量密度随粒子尺寸的变化, 以及不同尺寸分布的杂质粒子诱导熔石英表面的损伤概率。通过损伤实验测试获得了不同光斑尺寸的355 nm激光辐照作用下熔石英表面的损伤概率, 与理论计算结果进行对比, 在相同粒子分布参数下, 分析了三种杂质粒子对损伤概率的贡献(Cu>Al>CeO2)。通过该模型能够分析光学基底或薄膜亚表面中不同潜在的杂质吸收性粒子对光学元件损伤概率的影响。
熔石英 杂质粒子 临界能量密度 激光损伤概率 fused silica impurities critical fluence laser induced damage probability 红外与激光工程
2017, 46(4): 0406002
Author Affiliations
Abstract
A new method based on Maxwell's equations, ABCD ray matrices, and total internal reflection is proposed to theoretically analyze the characteristics of eigenmodes confined in nano-width rectangle resonators. Using this method, mode wavelengths and indices of transverse and longitudinal modes are obtained. Another method based on the finite difference time domain technique and Pad′e approximation is used to numerically calculate resonant wavelengths, mode field distributions and quality factors. The results of two methods show that the resonant wavelengths obtained from both methods are very close, and the maximum relative error is less than 2%. The mode indices of transverse and longitudinal modes obtained agree well with mode field distribution patterns calculated by finite difference time domain techniques.
230.5750 Resonators 230.7370 Waveguides Chinese Optics Letters
2014, 12(2): 022303
1 四川大学电子信息学院, 四川 成都 610065
2 华北光电技术研究所, 北京 100015
基于随机激光的时域理论,利用时域有限差分法(FDTD)数值求解麦克斯韦方程组和速率方程组,分别计算了二维无序介质中抽运速率和散射颗粒折射率对随机激光辐射的影响,同时还分析了介质中不同区域的输出谱和空间模式分布。计算结果显示,对于二维随机介质,在其他条件保持不变的情况下,散射颗粒折射率与背景介质折射率差越大,随机激射的阈值越低。介质中不同区域的辐射谱是不同的,且随着激励源抽运强度而变化。随机激光辐射始终集中在介质中某几个固定区域,但各个区域的随机激射效率是不同的,同时在区域之间存在模式的空间范围重叠。
激光技术 二维无序介质 折射率 空间分布 随机激光器