title: Actively mode-locked all fiber laser with cylindrical vector beam output.
abstract: We demonstrated an all fiber actively mode-locked laser that emits a cylindrical vector beam. An intra-cavity few-mode fiber Bragg grating inscribed in a short section of four-mode fiber is employed to provide mode selection and spectrum filtering functions. Mode coupling is achieved by offset splicing between the single-mode fiber and the four-mode fiber in the laser cavity. A LiNbO3 Mach-Zehnder modulator is used to achieve active mode-locking in the laser. The laser operates at 1547 nm with 30 dB spectrum width of 0.2 nm. The mode-locked pulses have a duration of 2 ns and repetition of 12.06 MHz. Through adjusting the polarization state in the laser cavity, both radially and azimuthally polarized beams have been obtained with high mode purity.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Anting
authors.initials: A
authors.lastname: Wang
authors.forename: Chun
authors.initials: C
authors.lastname: Gu
authors.forename: Biao
authors.initials: B
authors.lastname: Sun
authors.forename: Lixin
authors.initials: L
authors.lastname: Xu
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Dick
authors.initials: D
authors.lastname: Chung
authors.forename: Qiwen
authors.initials: Q
authors.lastname: Zhan