摘要
设计了一种新型锥形激光光束变换器,它根据全内反射-折射原理扩大或压缩入射激光束的直径。利用光线追迹的方法研究了传输光线的传输规律和特性,并进行了相应的计算机模拟。设计的变换器可以将沿中心轴入射的单色平行光束压缩成平行于中心轴的光束、会聚在中心轴的光束或空心光束。对于入射的非平行光,它的特性同传统的成像扩束器相似,所不同的是拉格朗日不变量不再是常量,当压缩光束的直径时拉格朗日不变量略有减小,当扩大光束的直径时拉格朗日不变量略有增大。设计的变换器具有结构简单、价格便宜和倍率高等优点。
A novel laser beam conventor is proposed in this paper. It can change the diameter of incident beam according to the theory of total internal reflection-refraction principle. The propagation rule and characteristic of the propagation beam are studied by using ray-tracing method and computer simulation. This conventor can shrink a parallel laser beam into a parallel laser beam with the smaller diameter along the propagation axis, a laser beam focusing on the center axis and a hollow laser beam. For a nonparallel beam, it has similar characteristic to traditional beam expanders. The difference is that the Lagrange invariant （the product of diameter and radiation angle） is not constant, that is to say, the Lagrange invariant will decrease with the increase of diameter and increase with the decrease of diameter, slightly. This novel conventor has the advantages of simple structure, low price, high magnification and high propagation efficiency, so it can be effectively used in many applications.
出处
《光学与光电技术》
2008年第5期15-18,共4页
Optics & Optoelectronic Technology
