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激光求的径向功率分布,即横模不仅是光束本身的一个重要质量参数,而且也是激光加工中的一个引人注目的问题,横模测量的意义在七十年代初就开始吸引人们从事这方面的研究,目前发展起来了包括红外摄像、烧蚀有机玻璃,扫描、热蒸发、光热偏转、干涉等方法在内的许多测量方法。但国内采用的方法非常有限,常用的是激光烧蚀有机玻璃的实验,这种方法本质是对光束连续作用的统计,不能真实地反映光束径向能量的场分布。本文发展了一种针扫描测量光束径向能量分布的方法,并进行了试验。该系统由扫描、传感、数据采集、处理等单元构成,设计性能可以在百瓦到千瓦的功率水平上测量束径(0.2～35)mm 光束的横模,结果经处理、显示,可以得到光求横模的三维分布。
The radial power distribution obtained by the laser, that is, the transverse mode is not only an important quality parameter of the beam itself, but also an attractive issue in laser processing. The significance of transverse mode measurement began in the early seventies to attract people to engage in this At present, many measurement methods have been developed, including infrared camera, ablation plexiglass, scanning, thermal evaporation, photothermal deflection, interference and other methods. However, the method adopted in China is very limited. The commonly used experiment is the laser ablation of plexiglass. The essence of this method is the statistics of the continuous action of the light beam, which can not truly reflect the field distribution of the radial energy of the light beam. In this paper, a method of needle scanning to measure the radial energy distribution of a beam has been developed and tested. The system consists of scanning, sensing, data acquisition, processing and other units. Its design performance can measure the transverse mode with beam diameter (0.2 ~ 35) mm at the power level of 100 W to 1000 W. The result is processed and displayed, Light seeking three-dimensional distribution of transverse mode.