title: Bi2Te3based passively Q-switched fiber laser with cylindrical vector beam emission.
abstract: We report a passively Q-switched fiber laser with cylindrical vector beam output modes using a few-mode fiber Bragg grating as a polarization-selective output coupler and Bi2Te3as the saturable absorber. Both radially and azimuthally polarized beams can be readily generated, and the output polarization can be switchable by tuning the polarization controllers inside the laser cavity. The repetition rate of the Q-switched laser can be tuned from 31.54 to 49.40 kHz when the pump power increases from 103.5 to 139.5 mW. The fiber laser operates at a single wavelength of 1557.5 nm with a 3 dB linewidth of <0.04  nm.
authors.forename: Ke
authors.initials: K
authors.lastname: Yan
authors.forename: Jian
authors.initials: J
authors.lastname: Lin
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Chun
authors.initials: C
authors.lastname: Gu
authors.forename: Lixin
authors.initials: L
authors.lastname: Xu
authors.forename: Anting
authors.initials: A
authors.lastname: Wang
authors.forename: Peijun
authors.initials: P
authors.lastname: Yao
authors.forename: Qiwen
authors.initials: Q
authors.lastname: Zhan