硬边衍射超高斯光束传输特性的自收敛束宽法研究  

Propagation Properties of Hard-edge Diffracted Super-Gaussian Beams by Using the Self-convergent Beam Width Method

作　　者：罗时荣[1] 吕百达[1] 

机构地区：[1]四川大学激光物理与化学研究所,四川成都610064

出　　处：《中国激光》2002年第9期821-825,共5页Chinese Journal of Lasers

基　　金：国家高技术光束控制重点实验室基金;激光技术国家重点实验室基金(No.2000-0009;No.2000-0010)

摘　　要：用自收敛束宽法,对有硬边衍射超高斯光束束宽的传输及其参数作了研究,研究表明,当自收敛束宽因子满足一定条件时,超高斯光束的自收敛束宽与基于无截断二阶矩定义的束宽遵循相同的传输规律,因此,自收敛束宽法定义的光束传输因子在传输过程中保持不变。还对自收敛束宽法和渐近近似法作了详细比较,对这两种方法的等价性作了讨论,并且对自收敛束宽法赋予了简明的物理含义。Using the self-convergent beam width method, the beam width propagation and beam-propagation parameters of hard-edge diffracted super-Gaussian beams are studied. It is found that the self-convergent beam width of super-Gaussian beams obeys the same law as that of the beam width based on the second-order moments without truncation, when the self-convergent-width facto satisfies a certain condition. Therefore the beam propagation factor (M2-factor) obtained by using this method is invariable upon propagation. Meanwhile, a detailed comparison between the self convergent beam width method and the asymptotic approach is made and the equivalence between the two methods is discussed. In addition, a concise physical meaning of the self-convergent beam width method is given.

关 键 词：自收敛束宽 自收敛束宽因子 光束传输因子 M^2因子 渐近近似法 超高斯光束 

分 类 号：TN012[电子电信—物理电子学]