Open AccessManipulation of orbital angular momentum beams based on space diffraction compensation
Author(s) -
Hailong Zhou,
Jianji Dong,
Siqi Yan,
Yifeng Zhou,
Lei Shi,
Chi Zhang
Publication year - 2014
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.22.017756
Subject(s) - optics , diffraction , paraxial approximation , physics , fresnel diffraction , angular momentum , ptychography , phase (matter) , fourier transform , orbital angular momentum of light , lens (geology) , beam (structure) , total angular momentum quantum number , classical mechanics , quantum mechanics
We put forward a technique to manipulate the size of orbital angular momentum (OAM) beams based on space diffraction compensation. Paraxial Fresnel diffraction which carries a negative spatial quadratic phase distribution can be regarded as a negative diffractive effect. To compensate the negative diffraction, we employ a 4f Fourier lens system containing a phase mask to generate an inverse quadratic phase. The size of OAM beams can be easily controlled by designing the phase mask profile without changing the OAM. The applications of space diffraction compensation in OAM demultiplexing, ring fiber coupling for OAM beams and optical manipulation of micro particles are also discussed.