title: Manipulation of orbital angular momentum beams based on space diffraction compensation.
abstract: 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.
authors.forename: Hailong
authors.initials: H
authors.lastname: Zhou
authors.forename: Jianji
authors.initials: J
authors.lastname: Dong
authors.forename: Siqi
authors.initials: S
authors.lastname: Yan
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Zhou
authors.forename: Lei
authors.initials: L
authors.lastname: Shi
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang