title: Far-field intensity distribution and M2 factor of hollow Gaussian beams.
abstract: The far-field intensity distribution of hollow Gaussian beams was investigated based on scalar diffraction theory. An analytical expression of the M2 factor of the beams was derived on the basis of the second-order moments. Moreover, numerical examples to illustrate our analytical results are given.
authors.affiliation: Graduate School of the Chinese Academy of Sciences, Beijing 100039, China. ddg@mail.siom.ac.cn
authors.forename: Degang
authors.initials: D
authors.lastname: Deng
authors.forename: Xiaoyong
authors.initials: X
authors.lastname: Fu
authors.forename: Chaoyang
authors.initials: C
authors.lastname: Wei
authors.forename: Jianda
authors.initials: J
authors.lastname: Shao
authors.forename: Zhengxiu
authors.initials: Z
authors.lastname: Fan