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 中国科学院中国工程物理研究院高功率激光物理联合实验室，上海 201800
3 装备发展部某中心，北京 100034
随着能量输出能力的不断提升，高功率激光驱动器运行对光学元件的性能和打靶光束的质量都有了更高要求。传统测量仪器结构复杂、精度有限，难以满足实验需求。朱健强课题组将计算成像技术引入到高功率激光驱动器的参数测量中，精确测量大口径光学元件的形貌、应力分布、热畸变等特征，脉冲光束的时间、空间、近远场分布等参量，以及激光与物质相互作用的过程；进一步发展相干衍射成像（CDI）技术，开发出单次曝光三维PIE（ptychography iterative engine）技术、多模态相干调制成像（CMI）技术、分束编码成像技术等，建立了相干衍射成像技术的解析模型，在数学上分析了CDI技术解的唯一性。本文主要综述了课题组在惯性约束聚变中计算光学成像技术应用方面的研究进展。
计算成像 相位测量 激光束表征 激光放大器 光学学报
2023, 43(22): 2200001
1 华中科技大学光学与电子信息学院，湖北 武汉 430074
2 湖南理工学院信息科学与工程学院信息光子学与空间光通信湖南省重点实验室，湖南 岳阳 414006
利用环形艾里振幅调制部分相干光（PCB），解决PCB的光束扩散问题，并研究了艾里函数尺度因子、截断孔径和相干长度对光束自聚焦距离和聚焦强度的影响，以及部分相干环形艾里光束在湍流环境中的闪烁指数。研究结果表明：通过调制环形艾里振幅可以控制PCB的聚焦距离，并在保留PCB对抗湍流影响、减轻光强闪烁的同时减少光束发散，聚焦点处光强闪烁较原本PCB得到进一步降低。
物理光学 湍流光学 激光传输 激光光束特性 环形艾里部分相干光 自聚焦 光束调控 光学学报
2022, 42(20): 2026002
1 中国科学院空天信息创新研究院，北京 100094
2 中国科学院大学光电学院，北京 100049
提出了一种千瓦级半导体激光器叠阵中单巴条的激光功率和光谱参量的集成测试技术。利用自主研发的光阑将激光器叠阵中任意单巴条的光束与其他巴条的光束分离，并利用积分球对分离出的单巴条光束的功率和光谱参量进行集成测试，再与整个激光器叠阵的功率和光谱参量的集成测试结果进行比对。实验结果表明：利用自主研发的光阑实现了将1 kW激光器叠阵中任意单巴条光束与其他巴条光束的分离，光阑对单巴条光束的透过率为98%；结合积分球集成测试系统实现了激光器叠阵中所有巴条的单独测试，解决了激光器叠阵中单巴条测试需要拆封的传统问题。此外该系统实现了对整个激光器叠阵的快速扫描测试，可直观反映激光器叠阵中每个巴条的情况。
测量 二极管激光器阵列 激光光束特性 积分球 激光与光电子学进展
2021, 58(23): 2312004
Author Affiliations
Abstract
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
We demonstrate a Fe:ZnSe laser gain-switched by a ZnGeP2 optical parametric oscillator (OPO) under the pulse repetition frequency of 1 kHz at room temperature. The 2.9 μm signal light of the OPO is employed as the pump for the Fe:ZnSe laser. The maximum output power of the Fe:ZnSe laser is 58 mW with the pulse duration of 2.7 ns under the incident pump power of 280 mW, corresponding to a peak pulse power of 21.5 kW and an optical-to-optical efficiency of 20.7%. The spectrum of the Fe:ZnSe laser has a range of 4030.2–4593.6 nm with a dip at 4187.1–4340.4 nm due to the absorption of CO2.
140.3070 Infrared and far-infrared lasers 140.3295 Laser beam characterization Chinese Optics Letters
2019, 17(8): 081404
1 中国科学院安徽光学精密机械研究所光子器件与材料安徽省重点实验室, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
采用氙灯抽运研究了原子数分数为10%的Er
3+掺杂的YAP晶体在2.7~3 μm波段的激光性能,使用3种不同透射率的输出镜,实现了最大输出能量为1173 mJ@1 Hz、1284 mJ@5 Hz、495 mJ@10 Hz、104 mJ@20 Hz的激光输出,对应的斜率效率分别为0.80%、0.99%、0.84%和0.44%。当重复频率为5 Hz,透射率为15%时,该晶体具有最大的输出能量和激光效率,相应的平均输出功率达到了6.42 W,约是目前已报道最好结果的4倍。测量了不同输入功率下Er∶YAP激光的光束质量,随着输入功率的增加,其光束质量逐渐下降。在输出激光中观察到了波长分别为2710,2728,2795,2918 nm的4条激光谱线。因此,Er∶YAP晶体可以实现优良的多波长中红外激光输出。
激光器 铒激光 Er∶YAP晶体; 氙灯抽运 吸收光谱 激光光束表征
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
Author Affiliations
Abstract
1 Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
2 Molecular Chirality Research Center, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
3 Department of Electrophysics, National Chiao Tung University, 1001 Ta-Hsueh Rd., Hsinchu 30010, Taiwan
We theoretically analyzed the relationship between quantum Green’s functions of two-dimensional harmonic oscillators and radial-order Laguerre–Gaussian laser modes of spherical resonators. By using a nearly hemispherical resonator and a tight focusing in the end-pumped solid-state laser, we successfully generated various laser transverse modes analogous to quantum Green’s functions. We further experimentally and numerically verified that the transverse order associated with quantum Green’s functions is noticeably raised with increasing the pump power induced by the thermal effect. More importantly, the high lasing efficiency and the salient structure enable the present laser source to be used in exploring the light–matter interaction.
Laser beam characterization Lasers solid-state Lasers diode-pumped Photonics Research
2017, 5(6): 06000733
Author Affiliations
Abstract
1 Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
2 Institute of Optoelectronic Science, National Taiwan Ocean University, Keelung 20224, Taiwan
3 Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO4/Cr4+:YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG0,m or HGm,0 eigenmodes with the order m between 0 and 14 can be generated, depending on the off-axis displacement along the y axis or the x axis. On the other hand, lasing modes naturally turn into planar geometric modes when the off-axis displacement is larger than the value for exciting the HG0,m or HGm,0 eigenmodes with m>14. The overall peak powers for high-order eigenmodes or geometric modes can exceed 140 W. Furthermore, the high-order eigenmodes and geometric modes are employed to generate vortex beams with large orbital angular momentum by using an external cylindrical mode converter. Theoretical analyses are performed to confirm experimental results and to manifest the phase structures of the generated vortex beams.
(050.4865) Optical vortices (140.3295) Laser beam characterization (140.3580) Lasers solid-state (140.3540) Lasers Q-switched. Photonics Research
2017, 5(6): 06000561
Author Affiliations
Abstract
1 National Laboratory on High Power Lasers and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 University of Chinese Academy of Science, Beijing 100049, China
We present a lamp-pumped Nd: phosphate glass laser amplifier delivering up to 1 J of pulse energy at 1053 nm with a repetition rate of 1 Hz and an injected pulse energy of 2.5 mJ. The amplifier system employs a beam-shaping module and a four-pass, lamp-pumped amplifier. The thermally induced wavefront distortion is mitigated and a uniform gain distribution is obtained by a four-lamp-pumped laser head in the amplifier. Thus, an excellent beam quality is obtained.
140.3280 Laser amplifiers 140.5560 Pumping 140.6810 Thermal effects 140.3295 Laser beam characterization Chinese Optics Letters
2017, 15(1): 011401
Author Affiliations
Abstract
1 Optical Networking and Sensing Department, NEC Laboratories America, Inc., Princeton, NJ 08540, USA
2 School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China
Remotely sensing an object with light is essential for burgeoning technologies, such as autonomous vehicles. Here, an object’s rotational orientation is remotely sensed using light’s orbital angular momentum. An object is illuminated by and partially obstructs a Gaussian light beam. Using an SLM, the phase differences between the partially obstructed Gaussian light beam’s constituent OAM modes are measured analogous to Stokes polarimetry. It is shown that the phase differences are directly proportional to the object’s rotational orientation. Comparison to the use of a pixelated camera and implementation in the millimeter wave regime are discussed.
280.4788 Optical sensing and sensors 280.3420 Laser sensors 260.6042 Singular optics 080.4865 Optical vortices 140.3295 Laser beam characterization Chinese Optics Letters
2017, 15(3): 030012
