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一般情况下 ,Gauss光束基模复参量q的ABCD定律对高阶模是不适用的 .将某一特定谐振腔的Rayleigh长度ZR 取代q参量虚部的光斑尺寸w ,q参量的AB CD定律可由Gauss光束基模推广到高阶模或几个模的叠加 .从理论和实验上研究并比较了当聚焦镜作长距离飞行时理想光学谐振腔和实际高功率激光谐振腔输出的Gauss光束不同模式的远场聚焦特性 ,纠正了国内外部分学者对这一问题的误解 .飞行光束聚焦特性的研究 ,对于飞行光学激光加工、光学飞行器、大型激光工程空间滤波器等应用领域具有重要研究价值
In general, the ABCD law of the Gaussian beam complex parameter q is not applicable to the higher order mode. The Rayleigh length ZR of a particular resonator is substituted for the spot size w of the imaginary part of the q parameter. The ABCD law for the q parameter can be derived from the Gauss beam The fundamental mode is extended to the superposition of higher order modes or several modes.The far field focusing of different modes of the Gauss beam output by the ideal optical cavity and the actual high power laser cavity when the focusing mirror is used for long distance flight is studied and compared theoretically and experimentally And correct some misunderstandings on this issue by some scholars both at home and abroad.The research on the focusing characteristics of flying light beams has important research value for the application fields of flying optical laser processing, optical flying vehicles and large-scale laser engineering spatial filters