Propagation and orbital angular momentum of vortex beams generated from a spiral phase plate-fiber. (6th February 2019)

• Record Type: Journal Article
• Authors: Ding, Manman; Chen, Ying; Zhao, Yongguang; Zhou, Wei; Koshelev, Alexander; Munechika, Keiko; Liu, Qiyao; Feng, Tianli; Wang, Yicheng; Pan, Zhongben; Shen, Deyuan; Griebner, Uwe; Petrov, Valentin
• Is Part Of: Laser physics letters. Volume 16:Number 3(2019:Mar.)
• Publication Date: 2019-02-06
• Subjects: spiral phase plate (SPP)-fiber -- optical vortices -- orbital angular momentum; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aafcb1
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We report on the generation of vortex beams employing a spiral phase plate (SPP)-fiber, which is fabricated by directly imprinting an SPP on the tip of a single-mode optical fiber. The generated high-order Laguerre-Gaussian (LG p, l ) modes with a radial number of p > 0 diverge quickly, thereby leaving the main LG0, −1 mode in the far field. Employing 1D Fourier transform, the average orbital angular momentum is determined to be −0.989 ħ per photon, close to the theoretically calculated value of ~ − ħ . Such an SPP-fiber, offering a simple way to produce vortex beams, could be a promising candidate for applications in multi-dimensional optical trapping and material microstructure processing.