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作者： baida lü, shirong luo Department of Opto-Electronics, Science and Technology, institute of laser physics and chemistry. sichuan university. chengdu 610064. china

Based on a generalized truncated second-order irradiance moments definition, an analytical generalized beam propagation factor (M-factor) of hard-edge diffracted cosh-Gaussian beams is derived and illustrated numerically. It is shown that the advantage of the method is its consistency with the previous results. The relevant subjects of truncated beams are also discussed. 2000 Published by Elsevier Science B.V. All rights reserved.

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平顶高斯光束在单轴晶体中的传输

物理学报 2003年第12期52卷 3061-3067页

作者：罗时荣吕百达四川大学激光物理与化学研究所华中科技大学激光技术国家重点实验室武汉430074

基于光束在各向异性单轴介质中的近轴矢量传输理论 ,对平顶高斯光束在单轴晶体中的传输作了研究 ,得到了解析的传输公式 .利用该传输公式可用一种简单的方法研究平顶高斯光束在单轴晶体中的传输 .研究结果表明 ,由于晶体的各向异性特性... 详细信息

基于光束在各向异性单轴介质中的近轴矢量传输理论 ,对平顶高斯光束在单轴晶体中的传输作了研究 ,得到了解析的传输公式 .利用该传输公式可用一种简单的方法研究平顶高斯光束在单轴晶体中的传输 .研究结果表明 ,由于晶体的各向异性特性使平顶高斯光束初始的圆对称性在传输过程中不能保持 ,并且其偏振状态也随传输而变化 .用数值计算例对晶体内源于入射平顶高斯光束的寻常光和非常光的场分布以及x和y方向的偏振分量在空间中的演化都作了详细说明 .

关键词：平顶高斯光束单轴晶体各向异性近轴矢量传输公式光场分布线偏振光

A highly-sensitive automatic transient laser-induced breakdown spectroscopy system with high temporal and spatial resolution

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Chinese physics B 2012年第8期21卷 469-475页

作者：刘巧君冯瑞权郑玉臣罗时荣谭建成朱建华冼保生 Department of physics Sichuan University Faculty of Information Technology Macao University of Science and TechnologyMacao Special Administrative Region(SAR)China Meteorological and Geophysical Bureau Macao Special Administrative Region(SAR)China Department of physics Sichuan UniversityChengdu 610064China

A highly-sensitive automatic transient laser-induced breakdown spectroscopy （lIBS） system is designed and integrated. It successfully avoids the delay time selecting problem in the conventional lIBS system, and realizes the lIBS data acquisition with high spatiotemporal resolution automatically. Multiple transient spectra can be obtained in each measurement, which will provide more information for spectral research. The water-vapour and liquid-water Raman scattering spectra are captured by this system, and the comparison of experimental water-vapour Raman scattering spectrum with theoretical data verifies the reliability of the lIBS system. Based on this system, the air laser induced air breakdown spectra are captured and analysed. The system is also useful for the research on water-vapour Raman lidar remote sensing.

关键词： laser-induced breakdown spectroscopy water Raman spectrum water-vapour Ramanlidar

Optimization for epitaxial fabrication of infinite-layer nickelate superconductors

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Frontiers of physics 2024年第3期19卷 61-69页

作者： Minghui Xu Yan Zhao Xiang Ding Huaqian leng Shu Zhang Jie Gong Haiyan Xiao Xiaotao Zu Huiqian luo Ke-Jin Zhou Bing Huang liang Qiao School of physics University of Electronic Science and Technology of ChinaChengdu 610054China Beijing Computational Science Research Center Beijing 100193China Diamond light Source Harwell CampusDidcot OX110DEUnited Kingdom Beijing National laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan lake Materials laboratory Dongguan 523808China

The discovery of nickelates superconductor creates exciting opportunities to unconventional superconductivity. However, its synthesis is challenging and only a few groups worldwide can obtain samples with zero-resistance. This problem becomes the major barrier for this field. From plume dynamics perspective, we found the synthesis of superconducting nickelates is a complex process and the challenge is twofold, i.e., how to stabilize an ideal infinite-layer structure Nd_(0.8)Sr_(0.2)NiO_(2), and then how to make Nd_(0.8)Sr_(0.2)NiO_(2) superconducting? The competition between perovskite Nd_(0.8)Sr_(0.2)NiO_(3) and Ruddlesden−Popper defect phase is crucial for obtaining infinite-layer structure. Due to inequivalent angular distributions of condensate during laser ablation, the laser energy density is critical to obtain phase-pure Nd_(0.8)Sr_(0.2)NiO_(3). However, for obtaining superconductivity, both laser energy density and substrate temperature are very important. We also demonstrate the superconducting Nd_(0.8)Sr_(0.2)NiO_(2) epitaxial film is very stable in ambient conditions up to 512 days. Our results provide important insights for fabrication of superconducting infinite-layer nickelates towards future device applications.

关键词： nickelate superconductivity infinite-layer plasma condensate plume dynamics

大气非线性自聚焦效应对艾里光束上行大气传输的影响

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中国激光 2024年第5期51卷 69-75页

作者：罗静季小玲李晓庆四川师范大学物理与电子工程学院四川成都610068

采用数值模拟方法研究了大气非线性自聚焦效应对艾里光束上行大气传输特性和光束质量的影响,结果表明:大气自聚焦效应随着艾里光束指数截断因子的增大而增强,并会导致艾里光束的实际焦点向靶面移动。采用预散焦方法可使靶面上的光束始... 详细信息

采用数值模拟方法研究了大气非线性自聚焦效应对艾里光束上行大气传输特性和光束质量的影响,结果表明:大气自聚焦效应随着艾里光束指数截断因子的增大而增强,并会导致艾里光束的实际焦点向靶面移动。采用预散焦方法可使靶面上的光束始终保持艾里轮廓,同时可使靶面光强得到显著提高。本文得到了预散焦的焦距公式,并证实了其有效性。研究发现:预散焦后,即使光束功率远远超过了自聚焦临界功率,非均匀大气的自聚焦效应也不会破坏艾里光束的自加速特性,有助于地基激光束避开障碍物,清除空间碎片。在相同的功率下,艾里光束相比高斯光束在碎片靶面上有更高光强,并且艾里光束具有更强的抵抗自聚焦效应的能力。因此,艾里光束比高斯光束更适合地基激光对空间碎片的清除。

关键词：大气光学艾里光束非线性自聚焦效应激光大气传输传输特性光束质量

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抑制反射镜热变形影响的支撑方式优化设计

激光与光电子学进展 2024年第9期61卷 403-410页

作者：罗超王毕艺杨海波袁磊柳建核工业西南物理研究院四川成都610200 光电信息控制和安全技术重点实验室天津300450 成都理工大学工程技术学院四川乐山614000

在高功率激光应用系统中,常通过反射镜对光束进行扩聚束、重定向、波前校正等控制。但控制系统中的各类反射镜会吸收部分光能从而形成非均匀温度场,使反射镜产生形变,进而影响反射光束质量。由于支撑方式与温度场共同决定反射镜的变形结... 详细信息

在高功率激光应用系统中,常通过反射镜对光束进行扩聚束、重定向、波前校正等控制。但控制系统中的各类反射镜会吸收部分光能从而形成非均匀温度场,使反射镜产生形变,进而影响反射光束质量。由于支撑方式与温度场共同决定反射镜的变形结果,因此在光束控制系统设计中,需要研究最佳的反射镜支撑约束方式。基于热弹性力学,提出了不同镜面支撑方式减小镜面热变形的方法;对几种常见支撑约束方式下的反射镜的温度场、变形量进行了量化仿真分析;对比了镜面的总变形量、光斑区域相对变形量、光斑区域相对变形量引入的波前像差。结果显示:对反射镜背面采用小块区域约束的支撑方式镜面相对变形量最小;对反射镜背面采用刚性约束的支撑方式镜面相对变形量最大;后者可以有效减小镜面相对变形量约98.4%。实验和仿真分析的镜面光斑区域的相对变形量十分接近,波前图像基本一致。这些研究结果为光束控制系统镜体支撑的选型和设计提供了理论支持。

关键词：激光传输镜面热变形热弹性力学模型像差分析

An Empirical Formula of Atomic K-Shell Ionization Cross Sections by Electron Impact

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Chinese physics letters 2001年第8期18卷 1053-1055页

作者： TANG Chang-Huan AN Zhu FAN Xiao-Qiang luo Zheng-Ming laser Fusion Research Center CAEPMianyang 621900 institute of Nuclear Science and Technology Sichuan UniversityKey Laboratory for Radiation Physics and Technology of Education Ministry of ChinaChengdu 610064 institute of Nuclear physics and chemistry CAEPMianyang 621900

An empirical formula is proposed to describe the K-shell ionization cross sections by electron impact over a wide range of atomic numbers and overvoltages U(the ratio between the electron incident energy and the binding energy of the electrons in the K-shell).The study is based on the analysis of existing experimental data of K-shell ionization cross *** expression shows the results in good agreement with the data for Zll as for 6≤Z≤79.

关键词： Electron ionization incident

Quantifying Information Flow between Two Chaotic Semiconductor lasers Using Symbolic Transfer Entropy

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Chinese physics letters 2012年第3期29卷 48-51页

作者： lI Nian-Qiang PAN Wei YAN lian-Shan luo Bin XU Ming-Feng TANG Yi-long Center for Information Photonics&Communications School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 610031

Symbolic transfer entropy(STE)is employed to quantify the dominant direction of information flow between two chaotic-semiconductor-laser time *** information flow in unidirectionally and bidirectionally coupled systems was analyzed *** results show that the dependence relationship can be revealed if there exists any coupling between two chaotic semiconductor *** importantly,in both unsynchronized and good synchronization regimes,the STE can be used to quantify the direction of information flow between the lasers,although the former case leads to a better *** results thus establish STE as an effective tool for quantifying the direction of information flow between chaotic-laser-based systems.

关键词： synchronization laser chaotic

Fe-doped ZnS film fabricated by electron beam evaporation and its application as saturable absorber for Er:ZBlAN fiber laser

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Chinese physics B 2021年第7期30卷 289-293页

作者： Jiu-lin Yang Guo-Ying Feng Du-Xin Qing Ya-Jie Wu Yun luo Jian-Jun Wang institute of laser&Micro/Nano Engineering College of Electronics and Information EngineeringSichuan UniversityChengdu 610064China Research Center of laser Fusion China Academy of Engineering PhysicsMianyang 621900China

High-quality Fe-doped Zn S films have been fabricated by electron beam *** the doping,the fabricated films still maintain the preferential crystalline orientation and phase purity of the host Zn *** to the observation of surface morphology,the root mean-square roughness of the samples increases slightly with the increase of doping *** of the prepared samples are in cubic zinc blende structure of Zn *** spectrum confirms a more obvious dip near 3μm with higher dopant concentration and it can be attributed to the typical^(5)E→^(5)T_(2)transition of Fe^(2+).Fe-doped Zn S film is also successfully used for Q-switched Er:ZBlAN fiber laser.

关键词： Fe-doped ZnS film electron beam evaporation Q-switching Er:ZBlAN