Open AccessTwo-frequency mutual coherence function of scattering from arbitrarily shaped rough objects
Author(s) -
Geng Zhang,
Zhensen Wu
Publication year - 2011
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.19.007007
Subject(s) - mutual coherence , optics , coherence (philosophical gambling strategy) , scattering , physics , curvature , gaussian , coherence theory , surface finish , spatial frequency , coherence length , mathematics , geometry , quantum mechanics , materials science , superconductivity , composite material
Based on the Physical optics approximation, the scattering field in the far zone by arbitrarily shaped objects with slightly rough surface which obeys Gaussian distribution and its two-frequency mutual coherence function are derived theoretically, and the numerical results for rough spheres and rough cylinders are given and analyzed. The results show that the function has closely relationship with the roughness and the dimension of the rough objects. The roughness and the curvature of the object influence both the amplitude and the profile of the two-frequency mutual coherence function. Also, the smaller the radius of the object, the larger the coherent bandwidth. The two-frequency mutual coherence function can be used to investigate the laser pulse scattering characteristics of arbitrarily shaped rough objects, provide theoretical basis for target recognition.