在分析激光光斑半径、发散角的几个基本参量测量原理基础上，对测量装置中软、硬件进行了分析，利用远场光点测量法，用普通光电探头对 He-Ne 激光器出射激光束进行远场测量。同时又利用计算机辅助工具（CCD测量）采集数据，用浙江光学仪器制造有限公司开发的WGZ-III型光强分布测定仪智能测试软件分析了激光束光强分布。根据激光束的强度分布信息，可得到激光束的其他空间参数，如激光器的振荡模式、光束发散角、光束功率、光斑半径等重要参数。
关键词：激光束 高斯光束 激光器 远场发散角 光斑半径 测量方法
The Study on Para metric characterization and measurement of laser beams
Abstract: With the increasing development of laser, the application of laser has penetrated into a variety of fields such as science, technology, militia and social development. How to construct a proper laser model is a popular and significant topic for scholars to discuss and study, and so is how to define and measure its parameters.
Laser’s far-field divergence angle is one of its important functional criteria. It not only reflects the laser divergence in the distance, but also can be regarded as the important foundation for laser re-formation. In this paper, the introduction is made of laser classification, application, and the special features of laser beams. The study is made on the laser spot radius, several basic parameters and measurement methods. The essential discussion is focused on the divergence angles of Gaussian beams.
On the basis of the analysis of laser spot radius and the measurements of several parameters of divergent angles, the further analysis is also made of the soft ware and hard ware of measurement device. The measurement is made on the laser beams supplied by He-Ne laser device by means of measuring far-field spot size in the distance and common optical fiber sensor. The use of CCD contributes a lot to the collection of the data and the analysis is made of laser beams’distributive strength by means of the intelligent soft ware for light intensity distribution measurement device, namely, WGZ-III developed by Zhejiang Optics Apparatus Manufacture Co. Ltd. The distribution of laser beams’ intensity leads to such important spatial parameters as oscillation modes of laser device, divergence angle of laser beams, the power of laser beams, laser radius etc.
The comparison is made between the divergence angle of far-field measurement of CCD and the divergence angle measured by common optical fiber sensor (photoelectron diode) and the discussion is made on experiment error. This comparison and discussion lead to a better accuracy of measurement. The input data by this model and the actual data are compared to find the concerned parameters on the basis of the known parameters measured by laser. And finally certain evaluation is made on the function of the known laser.
Key words laser beams; Gaussian beams; lasers, far-field divergence; spot radius[ measurement method.