红外与激光工程
2022, 51(3): 20210173
目前大气透射仪存在发射端和接收端安装调校困难的问题, 并且在工作过程中, 发射端和接收端一旦发生偏移, 光轴不处于一条直线, 将大大影响能见度测量结果。针对这些问题, 提出将近景摄影测量技术应用到大气透射仪的对准系统中, 采用圆形作为人工标志物, 通过图像处理及椭圆最小二乘拟合算法, 计算人工标志物的圆心坐标, 根据标志物的圆心坐标与摄像机镜头的中心坐标的位置关系, 将发射端和接收端的摄像机镜头的中心通过旋转结构拉倒图像中心；由于摄像机与光轴是同轴设计, 所以摄像机镜头对准就是实现了光轴的对准。实验证明, 利用近景摄影测量技术能够实现大气透射仪快速准确对准, 并且能够实时监控保证光轴始终保持一条直线。
近景摄影测量 大气透射仪 人工标志物识别 椭圆最小二乘拟合 close-range photogrammetry technique transmissometer artificial marker recognition elliptical least squares fitting
Author Affiliations
Abstract
1 Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Research Center of Space Laser Information Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China
A diode-side-pumped Tm,Ho:LuLiF laser at 2-1m wavelength obtained in a ring resonator and its amplification experiment are reported. At the maximum pump energy of 4.7 J available for the oscillator, the output energy per pulse for the oscillator decreases from 904 to 483 mJ in free running mode, and decreases from 106 to 68 mJ in Q-switched mode, with an increase of pump pulse repetition rate from 1 to 5 Hz. When considering the amplifier, 99-mJ Q-switched output energy is achieved at 5-Hz repetition rate.
固体激光器 Tm Ho:LuLF 2微米 声光调Q 140.0140 Lasers and laser optics 140.3540 Lasers, Q-switched 140.3580 Lasers, solid-state Chinese Optics Letters
2011, 9(9): 091407
Author Affiliations
Abstract
1 Research Center of Space Laser Information Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
A high repetition rate Tm:Ho:LuLiF master-oscillator and polarization-maintaining (PM) Tm-doped fiber power-amplifier system is presented. A 11.3-kHz, 0.4-nm line width, 0.89-W Tm:Ho:LuLiF seed laser is developed. Using a two-stage PM Tm-doped fiber power amplifier system, 32.4-W output power is obtained with 0.4-nm line width at a central wavelength of 2058.5 nm, corresponding to 0.66-W seed laser. The laser spectrum and pulse profile are measured.
Tm:Ho:LuLiF 2微米 MOPA 保偏掺铥光纤 140.3510 Lasers, fiber 060.2320 Fiber optics amplifiers and oscillators 060.2390 Fiber optics, infrared Chinese Optics Letters
2011, 9(4): 041407
Author Affiliations
Abstract
1 Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China
The characteristics of diode end-pumped Tm,Ho:LuLiF for continuous wave (CW) running and high pulse repetition frequency (PRF) Q-switched operation are illustrated. In the CW mode, 950-mW output power with a slope efficiency of 24% is obtained. In the Q-switched mode, output energy of 78 μJ under 10 kHz with a slope efficiency of 23% is achieved. The pulse stability, pulse width as a function of pump intensity, and spectral characteristics are also analyzed.
固体激光器 Tm Ho:LuLF 2微米 声光调Q 140.0140 Lasers and laser optics 140.3540 Lasers, Q-switched 140.5680 Rare earth and transition metal solid-state lasers 140.3580 Lasers, solid-state Chinese Optics Letters
2011, 9(2): 021401
1 军械工程学院 光学与电子工程系,河北 石家庄 050003
2 中国科学院 上海光学精密机械研究所,上海市全固态激光器与应用技术重点实验室,上海 201800
在高功率激光二极管(LD)抽运条件下,固体增益介质的热透镜效应是优化激光谐振腔系统所必须考虑的重要因素之一。利用带尾纤耦合输出的激光二极管和整形聚焦透镜组组合抽运Nd:YVO4晶体,用稳腔法测量了激光晶体的等效热焦距。利用LAS-CAD软件模拟了三种热稳腔结构在所测等效热焦距下的模式分布,对LD双端抽运Nd:YVO4激光器Z字型谐振腔进行优化设计后,实验选定后腔镜曲率半径R1=300 mm,输出镜曲率半径R2=100 mm,腔长Ltotal=280 mm,耦合输出镜透射率T=50%。当输入61 W抽运功率时,激光最高输出功率达21.3 W,光束质量因子M2 <1.41,所得激光器输出结果与理论预期吻合得很好。
激光器 LD双端面抽运 Nd:YVO4晶体 热焦距测量 热效应补偿
1 军械工程学院 光学与电子工程系, 石家庄 050003
2 中国科学院 上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海 201800
基于传输矩阵理论,针对双端面抽运的“Z”型折叠腔Nd∶YVO4 激光器的谐振腔设计进行了数值模拟,着重分析和比较了不同腔型稳定性的变化情况。“Z”型折叠腔中关于臂长的选择对于稳定性影响较大,平凹腔在较低的泵浦功率范围更加稳定,双凹腔的稳区范围较小,但是却更适合在高泵浦功率下工作。分别采用平-凹和双凹腔型对Nd∶YVO4的1064 nm连续激光进行了研究,在相同腔长不同腔型下分别获得了稳定的1 064 nm高功率激光输出,谐振腔稳区范围和输出功率变化规律与理论计算吻合。
激光器 Nd∶YVO4激光器 双端泵浦 腔稳定性 laser Nd∶YVO4laser dual-end-pumped stability of resonator
