Author Affiliations
Abstract
1 Northwestern Polytechnical University, School of Physical Science and Technology, MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, Xi’an, China
2 Shenzhen University, Collaborative Innovation Centre for Optoelectronic Science and Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen, China
Cylindrical vector beams and vortex beams, two types of typical singular optical beams characterized by axially symmetric polarization and helical phase front, possess the unique focusing property and the ability of carrying orbital angular momentum. We discuss the formation mechanisms of such singular beams in few-mode fibers under the vortex basis and show recent advances in generating techniques that are mainly based on long-period fiber gratings, mode-selective couplers, offset-spliced fibers, and tapered fibers. The performances of cylindrical vector beams and vortex beams generated in fibers and fiber lasers are summarized and compared to give a comprehensive understanding of singular beams and to promote their practical applications.
cylindrical vector beam vortex beam orbital angular momentum two-mode fiber fiber laser beam shaping Advanced Photonics
2021, 3(1): 014002
提出了一种新结构的高双折射光子晶体光纤, 通过引入掺氟实心圆的方式形成双折射, 而不采用大多数高双折射光子晶体光纤中引入不同孔径空气孔或椭圆空气孔的结构。应用全矢量平面波法对其基模场分布、模式截止以及各种结构参量对模式双折射特性的影响进行了详细的分析和讨论。结果表明, 该结构光子晶体光纤可以在较宽波长范围内产生10-3量级的模式双折射, 且通过调节孔径, 可以灵活地将双折射最高点调整到所需的波长上。另外, 该结构高双折射光子晶体光纤在拉制工艺、光纤强度以及光纤熔接等方面也具有一定的优势。
光纤光学 光子晶体光纤 高双折射 全矢量平面波法 双模光纤
