Open AccessGeneration of cylindrical vector beams and optical vortex by two acoustically induced fiber gratings with orthogonal vibration directions
Author(s) -
Keyan Wei,
Wending Zhang,
Ligang Huang,
Dong Mao,
Feng Gao,
Ting Mei,
Jianlin Zhao
Publication year - 2017
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.25.002733
Subject(s) - optics , azimuth , optical fiber , physics , fiber , transducer , vortex , acoustics , mode volume , flexural strength , vibration , coupling (piping) , materials science , graded index fiber , fiber optic sensor , composite material , thermodynamics , metallurgy
Mode coupling from the fundamental vector mode (HE11x) to the cylindrical vector beams (CVBs) and optical vortex beams (OVBs) of a few-mode fiber excited by two acoustic flexural waves with orthogonal perturbations is achieved by using a composite acoustic transducer. The HE11x mode is converted to TM 01 and TE 01 modes, which have radial and azimuthal polarizations, by using the lowest-order acoustic flexural modes of F11x and F11y, respectively. Furthermore, HE11x mode can also be converted to the ± 1-order OVBs of HE21even±iHE21odd through the combined acoustic modes of F11x±iF11y. This technique provides a useful way of generating CVBs and OVBs in optical fiber with conveniently electrically-controlled mode conversion characteristics.