Open AccessPropagation characteristics of nonparaxial Gaussian beams
Author(s) -
Deng Xiao-jiu,
Niu Guo-Jian,
Caixia Liu,
Shuangjiu Xiao
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.094202
Subject(s) - paraxial approximation , physics , gaussian , scalar (mathematics) , transverse plane , gaussian beam , beam (structure) , scalar field , divergence (linguistics) , optics , plane (geometry) , classical mechanics , quantum mechanics , mathematics , geometry , linguistics , philosophy , structural engineering , engineering
Based on the rigorous definition of light intensity of nonparaxial vectorial beams in the transverse plane, beam width, far-field divergence angles and M2 factors are defined by the power in the bucket. Taking nonparaxial vectorial Gaussian beam as an example, the detailed theoretical analyses and numerical calculations about the propagation characteristics are performed, and the results are compared with those from the nonparaxial scalar theory. Showing that when the half width of light source ω0 is less than Λ, there are obvious differences between the propagation characteristics described by the nonparaxial scalar and the vectorial theory, and their propagation characteristics tend to be consistent with ω0 increasing, change to that obtained in the paraxial scalar approximation gradually.