强激光与粒子束, 2013, 25 (2): 276, 网络出版: 2013-01-07
基于光纤阵列的激光光斑测量方法
Laser intensity distribution measuring method based on fiber array
摘要
提出一种基于光纤阵列的激光光斑时空分布测量方法,采用在多层石英平板上制作V型槽并层叠石英光纤阵列的方法,获得了具有较高抗激光损伤能力和空间分辨力的光纤阵列取样器,实现了激光光斑的空间分布取样。给出了光纤阵列的取样原理、取样器结构和大倍数光强衰减的设计。实验结果表明:光纤阵列抗激光损伤能力优于10 kW/cm2(50 s),系统空间分辨力优于3 mm,测量误差小于3%。(State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi’an 710024, China)Abstract:Key words:
Abstract
A method for measuring laser intensity distribution based on fiber array is presented. The principle and structural design of the fiber array are introduced. The attenuation characteristic is analyzed theoretically. A demonstration module is built in our lab. And experiments are carried out with a high power fiber laser operating at 1064 nm. The experimental results show that this system can provide laser power density distribution information with a spatial resolution better than 3 mm and with a measurement error less than 3%. Experiments with fiber laser radiation and numerical simulation by the finite element method indicate that the damage threshold of the fiber array is higher than 10 kW/cm2 with a radiation time of 50 s. Therefore, it might be appropriate for the method to measure the high energy laser beam directly.
吴勇, 杨鹏翎, 陈绍武, 刘卫平, 武俊杰, 陶蒙蒙, 刘福华, 冯国斌, 叶锡生. 基于光纤阵列的激光光斑测量方法[J]. 强激光与粒子束, 2013, 25(2): 276. Wu Yong, Yang Pengling, Chen Shaowu, Liu Weiping, Wu Junjie, Tao Mengmeng, Liu Fuhua, Feng Guobin, Ye Xisheng. Laser intensity distribution measuring method based on fiber array[J]. High Power Laser and Particle Beams, 2013, 25(2): 276.