Open AccessEffect of the correlation function on the focal shift of a partially coherent beam
Author(s) -
Minghui Zhang,
Yuntian Chen,
Yangjian Cai,
Lin Liu
Publication year - 2016
Publication title -
journal of the optical society of america. a, optics, image science, and vision./journal of the optical society of america. a, online
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.803
H-Index - 158
eISSN - 1520-8532
pISSN - 1084-7529
DOI - 10.1364/josaa.33.002509
Subject(s) - optics , physics , fresnel number , coherence (philosophical gambling strategy) , beam (structure) , correlation , correlation function (quantum field theory) , amplitude , lens (geology) , function (biology) , gaussian beam , gaussian , spatial coherence , mathematics , diffraction , quantum mechanics , laser , geometry , evolutionary biology , dielectric , biology
It is known that the focal shift is closely related with the Fresnel number of the lens system, the amplitude, and the spatial coherence of the light beam. In this paper, we investigate the focusing properties of a partially coherent beam with nonconventional correlation function, named a generalized multi-Gaussian correlated Schell-model beam, through deriving the analytical expression for its effective beam width. We find that the focal shift is also affected by the structure parameter of the correlation function. Our results provide a novel way for controlling the focal shift.