We propose and demonstrate a continuous-wave all-fiber ring laser generating cylindrical vector beams (CVBs) using a MSC as transverse mode converter and mode splitter. The MSC is fabricated by a novel method free of pre-tapering, achieving LP11 mode with a high purity of > 96% near the wavelength of 1064 nm. The CVB fiber laser operates at a center wavelength of 1053.9 nm, with a 3 dB linewidth of less than 0.04 nm and a signal-to-background ratio of > 60 dB. The laser slope efficiency is > 9%. The radially and azimuthally polarized beams can be switched by adjusting the polarization controllers in the fiber ring cavity, with a high mode purity measured to be > 96%.
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This work was supported in part by the National Natural
Science Foundation of China under Grant 11704199, in part by the National
Science Foundation of Jiangsu Province under Grant BK20150858 and
Grant BK20161521, in part by the Postgraduate Research & Practice Innovation Program of Jiangsu Province under Grant KYCX17_0746, in part by
the Distinguished Professor Project of Jiangsu under Grant RK002STP14001,
in part by the Talents Projects in Nanjing University of Posts and Telecommunications under Grant NY214002 and Grant NY215002, and in part by
the STITP of NUPT under Grant XZD2017040. (
- Cylindrical vector beams
- optical fiber lasers
- mode converter