截断平顶光束的广义M^2因子和相干模分解

The generalized M^2-factor and coherent-mode decomposition of truncated flat-topped beams

针对Li提出的平顶光束的新描述模型 ,分别采用广义二阶矩方法和矩形函数的复高斯函数展开方法 ,推导出平顶光束通过硬边光阑的广义光束传输M2 因子和模相关系数的解析表达式 .以此为基础 ,对截断平顶光束的模相关、模结构以及相干模分解进行了分析 ,建立了截断平顶光束的相干模分解理论 .

By using the definition of generalized second-order moments and complex Gaussian functions expansion of rectangular function, the analytical expressions for the generalized M2-factor and mode coherence coefficients of the new model of flat-topped beams introduced by Li have been derived. The mode correlation, mode structure, and coherent-mode decomposition of flat-topped beams have been analyzed. Theory of the coherent-mode decomposition of truncated flat-topped beams is built.