摘要
光束光强分布的陡峭度或平整度通常可用陡峭度参数(K参数)来描述。以双曲余弦-高斯光束、贝塞尔函数调制的高斯光束和平顶高斯光束3种光束为例,给出了详细的数值计算和物理解释。研究表明,K参数只适用于描述呈钟形光束剖面的陡峭度,但不适用于有强衍射旁瓣、强调制或有中心凹陷的光束。
It is known that usually the degree of sharpness (or flatness) of beam intensity distribution is described by the kurtosis parameter ( K parameter),Taking cosh-Gaussian ( ChG),Bessel-modulated Gaussian ( QBG),and flattened Gaussian (FG) beams as three illustrative examples,detailed numerical calculations and physical interpretations were given, It is shown that the K parameter is suited essentially to characterize the sharpness of the bell-shape beam profile,but not applicable to beams with large diffraction sidelobes,large intensity modulations,and beams with central shadow。
出处
《激光技术》
CAS
CSCD
北大核心
2005年第4期426-428,共3页
Laser Technology
基金
国家高技术基金资助项目(A823070)
作者简介
康小平(1964-),女,副教授,博士,现从事激光传输与变换的研究。E—mail:xpk710@126.com