多模激光的模相关和相干模表示

MODE CORRELATION AND COHERENT MODE REPRESEN TATION OF MULTI MODE LASER BEAMS 

对多模激光的模相关和相干模表示作了深入的理论研究．利用部分相干光理论，将与高斯谢尔模型光束等效的多模激光表示为空间相干，并且彼此可相关模式的叠加．给出了直角坐标系下模相关系数的解析表达式．基于Ｍ２因子概念，建立了在考虑模式相关的一般情况下的多模激光模分解理论．

Abstract A detailed theoretical study on the mode correlation and coherent mode representation of multi mode laser beams has been performed.By using the theory of partially coherent light,the multi mode laser beams behaving like Gaussian Schell model(GSM) beams have been represented by the superposition of spatially coherent modes,which may be mutually correlated.The analytical expressions for the mode coherence cofficients have been given in the rectangular coordinate system.Furthermore,based on the M 2 factor concept,the theory of the mode decomposition of multi mode laser beams has been built up for the general case,where the mode correlation is considered.