相位共轭光腔的非简并模

本文应用P C M 变换矩阵的两种形式计算了非简并情况下多元件P C R 腔镜上的模, 得出了稳定条件和模的微扰稳定性质     

失调激光系统的矩阵和图论处理方法

本文在前文的基础上,给出两种比较完整的方法,用以分析和计算满足近轴条件的非共轴激光系统的光束追迹.     

同轴火花隙值得进一步研究

一、与激光相竞争1972年,密执安州立大学Zynger和Crouch在美国应用光谱学会全国会议上提出:在短荧光光谱学的研究中,采用同轴电容经钨电极在大气中放电,能产生兆瓦级毫微秒火花,可同激光相竞争.它和普通光源相比,优点是:(1)脉冲短;(2)功率高;(3)噪声低.它和氮分子激光器相比,优点是;(1)光频可调;(2)结构简单;(3)造价低廉.该装置的主要指标是:光脉冲衰退时间7～15ns,波长从2000(?)到5700(?)的积分峰值功率约为10~6W.它的长度是42.2cm.     

Studies of beam propagation characteristics on apertured fractional Fourier transforming systems

Based on the principle that a rectangular function can be expanded into a sum of complex Gaussian functions with finite numbers, propagation characteristics of a Gaussian beam or a plane wave passing through apertured fractional Fourier transforming systems are analyzed and corresponding analytical formulae are obtained.Analytical formulae in different fractional orders are numerically simulated and compared with the diffraction integral formulae,the applicable range and exactness of analytical formulae are confirmed. It is shown that the calculating speed of using the obtained approximate analytical formulae,is several hundred times faster than that of using diffraction integral directly.Meanwhile,by using analytical formulae the effect of different aperture sizes on Gaussian beam propagation characteristics is numerically simulated, it is shown that the diffraction effect can be neglected when the aperture size is 5 times larger than the beam waist size.     

Studies of beam propagation characteristics on apertured fractional Fourier transforming systems

Based on the principle that a rectangular function can be expanded into a sum of complex Gaussian functions with finite numbers, propagation characteristics of a Gaussian beam or a plane wave passing through apertured fractional Fourier transforming systems are analyzed and corresponding analytical formulae are obtained. Analytical formulae in different fractional orders are numerically simulated and compared with the diffraction integral formulae, the applicable range and exactness of analytical formulae are confirmed.It is shown that the calculating speed of using the obtained approximate analytical formulae, is several hundred times faster than that of using diffraction integral directly. Meanwhile, by using analytical formulae the effect of different aperture sizes on Gaussian beam propagation characteristics is numerically simulated, it is shown that the diffraction effect can be neglected when the aperture size is 5 times larger than the beam waist size.     

真空激光自动监测大坝变形技术

针对大坝变形观测要求精度高和长期稳定可靠的难题，对美国斯坦福大学安装、调整直线加速器的真空中激光三点法作了关键性改进，并移用于大坝，其中用小孔代替透镜组，其作用是定位、限漂、扩束和点化，20年来，该技术先后运用和推广到太平哨、丰满、龚嘴、桓仁、云峰和太平湾大坝，特别在丰满发挥了重大的社会效益，该已正式被确定用于三峡。     

激光成珠大小镶嵌高效率逆反射列阵膜

用激光制成的微珠 ,并用大小珠镶嵌成逆反射列阵膜; 从原理上和实验效果上均优于目前具有 代表性的中国椒江公司 901膜和美国 3M公司 8910膜 . 它对交通标志的更新换代和国防应用具有产业 化前景 .     

M2 < 1激光束的产生过程及其初步评估

本文概述了 M2 < 1激光束的发射过程、传输变换特性和按 ISO测试结果 ,并作了初步的机理分 析和评估 .     

三峡水利枢纽激光监测系统的有关问题

在已设计建成并已正常运转 10多年的真空中三点法激光测坝变形系统的基础上 ,本文对长距 离三峡水利枢纽相应系统的有关光学、激光问题进行了基本判断和必要建议 .     

双玻璃珠列阵准相位共轭器

自从角反射列阵准相位共扼性质报道以来,光学元件列阵的准相位共轭性质的研究有了发展.文献[3]分析了列阵作为准相位共轭器的条件,根据这一原理,文献[4]和[5]已经报道了两种准相位共轭器件.本文介绍的双玻璃珠列阵是一种新的准相位共轭器. 双玻璃珠列阵是由φ=1.4mm的玻璃珠按图1组成列阵. 可以求得单个双玻璃珠的变换矩阵为其中 　　　　为玻璃珠的折射率,R为半径,f是高斯光学近似下玻璃珠的焦矩.将参考面从RP1,RP2移至 RP’1,RP’2,(1)式可化为 容易求得,双玻璃珠组成列阵的光线变换矩阵就是相位共轭器光线交换矩阵因此,它具有补偿波…