高斯光束特性实验研究  

Experimental Investigation of the Gauss Beam's Property

作　　者：杨晓冬[1] 谭锦业[1] 刘定文[1] 刘进宝[1] 

机构地区：[1]嘉应学院物理系,广东梅州514015

出　　处：《实验室研究与探索》2010年第8期23-25,32,共4页Research and Exploration In Laboratory

基　　金：广东省自然科学基金资助项目(8451401501000668)

摘　　要：提出了2种在激光原理实验教学中,测量高斯光束特性参数、研究高斯光束变换规律的装置和方案。①利用刀口法直接测量氦氖激光器后方,不同位置高斯光束光斑半径,对测量数据进行最小二乘法拟合,可得束腰半径、束腰位置、远场发散角及衍射倍率因子;②利用刀口法测量高斯光束经辅助透镜变换后,辅助束腰两侧不同位置的光斑半径,对测量数据进行最小二乘法拟合与计算,可确定光束经透镜变换后,光束的束腰半径、束腰位置、衍射倍率因子及远场发散角,再利用高斯光束变换规律,可以获得光束经透镜变换前,高斯光束的束腰半径、束腰位置、衍射倍率因子及远场发散角。2方案测量结果基本符合,测量结果和谐振腔理论符合较好。Two experiments methods and setups were proposed, which are applied to measure the Gauss beam parameters and investigate the transforming law of Gauss beam in the process of laser physics experiment teaching. In the first method,the radii of the Gauss beam at different points after the He-Ne laser are measured by the knife-edge method. Fitting the measured data by the least squares method, the beam waist radius, the location, the beam divergence and the propagation factor can be measured. In the second method, the radii of the Gauss beam beside the auxiliary beam waist, which is built by the lens,are measured by the knife-edge method. Then,fitting the measured data by the least squares method,the beam waist radius,the location ,the beam divergence and the propagation factor of the Gauss beam,which is transformed by the auxiliary lens, can be obtained. According to the transform laws of the Gaussian beam through the lens,the beam waist radius and the location of the Gaussian beam before the lens also can be calculated. The measured results are well agreed with the laser resonator theory.

关 键 词：高斯光束 光束变换规律 激光物理实验教学 

分 类 号：TN241[电子电信—物理电子学] G642.423[文化科学—高等教育学]