摘要
为验证正交光楔激光远场焦斑测量方法在提取光斑高频组分、扩展CCD测量动态范围和减小光束质量测量误差等诸方面的有效性,以常用的光束质量因子作为衡量新方法有效性的指标,建立离焦光斑强度分布理论模型并搭建相应的实验平台进行实验验证。验证结果表明:新方法与传统远场测量方案相比,使实验所用CCD的测量动态范围拓展了约9倍,实际光斑远离中心主核区域的大量高频旁瓣分布特征从CCD背景噪声起伏中凸显出来,光束质量因子的测量平均相对误差也有约16%的精度改善。
A method for focal spot reconstruction and far-field focal spot measurement based on the orthogonal wedges is proposed. In order to verify the validity of the method in extracting focal spot side lobe data, expanding measurement dynamic range of CCD and improving measurement precision of laser beam quality, the beam quality factor fl is taken as a useful evaluating measure here, the theoretical model of intensity profiles of the defocus spot is build and the laboratory scheme accordingly is im- plemented. The results show that, compared with the traditional measurement method, this method makes the dynamic range of CCD expand about 9 times, plenty of intensity information of the focal spot side lobe emerges from random noise of CCD, and the measurement precision of the beam quality factor is improved about 16%.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2012年第11期2543-2548,共6页
High Power Laser and Particle Beams
关键词
正交光楔
远场焦斑
CCD相机
动态范围
光束质量
orthogonal wedges
far-field focal spot
CCD camera
dynamic range
beam quality
