Open AccessNonparaxial vector Gaussian beams diffracted at a circular screen
Author(s) -
Pusheng Liu,
Baida Lü
Publication year - 2004
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.53.3724
Subject(s) - diffraction , paraxial approximation , physics , gaussian , optics , gaussian beam , fresnel diffraction , aperture (computer memory) , fresnel number , beam (structure) , quantum mechanics , acoustics
By using the vector Rayleigh diffraction integrals, an analytical expression for the diffraction of nonparaxial vector Gaussian beams at a circular screen is de rived. The diffracted on-axis field and farfield expressions and free-space pro pagation equation of nonparaxial vector Gaussian beams, as well as the paraxial Fresnel and Fraunhofer diffraction formulae of Gaussian beams diffracted at a ci rcular aperture are treated in a unified way as special cases of our general res ult. Numerical comparative examples are given to illustrate the intensity distri butions and far-field behavior of nonparaxial vector Gaussian beams. It is show n that for the diffraction at the circular screen both the f-parameter and truncation parameter affect the beam nonparaxiality.