中国激光, 2009, 36 (s1): 309, 网络出版: 2009-06-18  

正交散焦光栅M2因子测量系统设计研究

Research on the Measurement of M2 Factor Based on Crossed Defocus Gratings
作者单位
国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
摘要
对基于正交散焦光栅的M2因子测量系统进行了理论研究, 该测量系统可以同时测量光束束腰附近9个不同位置处的光强分布, 并由二阶矩方法计算束宽, 经双曲线拟合得到被测光束的M2因子。为了优化系统设计和提高系统测量精度, 根据高斯光束的薄透镜变换关系, 针对基模高斯光束和多模高斯光束, 分析被测光束束腰宽度、束腰位置和模式分布对测量系统测量精度的影响。结果表明, 基模高斯光束或者多模高斯光束所对应基模高斯光束的束腰宽度在设计范围内时, 系统可在较大的测量距离内具有较高的测量精度。该研究为实际系统的设计和测量提供了理论指导。
Abstract
M2 factor measuring system which based on crossed defocus gratings is theatrical analyzed. This instrument can get nine intensity distributions of different positions near the beam waist. The M2 factor is determined by calculating the beam waist using the second moment method and curve-fitting. According to the theory of Gaussian beam propagation and transformation; using the zeroth-order and multi-modes Gaussian beam, measured errors as functions of beam waist, positions and modes distribution are analyzed. If zeroth-order Gaussian beam waist radius or the zeroth-order Gaussian beam waist radius corresponding to multi-modes beam was properly controlled, the measuring system can work well in a large range. The guidance for the M2 factor measuring system is provided by this analysis.

马浩统, 习锋杰, 周朴, 王小林, 许晓军, 刘泽金. 正交散焦光栅M2因子测量系统设计研究[J]. 中国激光, 2009, 36(s1): 309. Ma Haotong, Xi Fengjie, Zhou Pu, Wang Xiaolin, Xu Xiaojun, Liu Zejin. Research on the Measurement of M2 Factor Based on Crossed Defocus Gratings[J]. Chinese Journal of Lasers, 2009, 36(s1): 309.

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