Open AccessPropagation of flat-topped multi-Gaussian beams through a double-lens system with apertures
Author(s) -
Yiqing Gao,
Bin Zhu,
Daizhong Liu,
Lin Zhang
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.012753
Subject(s) - optics , pinhole (optics) , spatial filter , gaussian , physics , offset (computer science) , ray transfer matrix analysis , gaussian filter , lens (geology) , beam (structure) , filter (signal processing) , point spread function , computer science , quantum mechanics , computer vision , programming language
A general model for different apertures and flat-topped laser beams based on the multi-Gaussian function is developed. The general analytical expression for the propagation of a flat-topped beam through a general double-lens system with apertures is derived using the above model. Then, the propagation characteristics of the flat-topped beam through a spatial filter are investigated by using a simplified analytical expression. Based on the Fluence beam contrast and the Fill factor, the influences of a pinhole size on the propagation of the flat-topped multi-Gaussian beam (FMGB) through the spatial filter are illustrated. An analytical expression for the propagation of the FMGB through the spatial filter with a misaligned pinhole is presented, and the influences of the pinhole offset are evaluated.