Definition and measurement of the beam propagation factor M^2 for chromatic laser beams  

作　　者：房滔 叶訢 牛金富 徐剑秋 

机构地区：[1]Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800

出　　处：《Chinese Optics Letters》2006年第10期586-588,共3页中国光学快报（英文版）

摘　　要：The concept of the beam propagation factor M^2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength. Using the new definition of factor M^2, the propagation of chromatic beams can be analyzed by the beam propagation factor M^2 as same as that of monochromatic beams. A simple method to measure the chromatic beam factor M^2 is demonstrated. The chromatic factor M^2 is found invariable while the laser beam propagates through the dispersion-free ABCD system.The concept of the beam propagation factor M^2 is extended for chromatic laser beams. The definition of the beam propagation factor can be generalized with the weighted effective wavelength. Using the new definition of factor M^2, the propagation of chromatic beams can be analyzed by the beam propagation factor M^2 as same as that of monochromatic beams. A simple method to measure the chromatic beam factor M^2 is demonstrated. The chromatic factor M^2 is found invariable while the laser beam propagates through the dispersion-free ABCD system.

关 键 词：Dispersion (waves) Light propagation 

分 类 号：TN249[电子电信—物理电子学]