title: Mode-locked all-fiber laser producing radially polarized rectangular pulses.
abstract: We propose and demonstrate a radially polarized mode-locked fiber laser through the use of a figure-8 cavity in combination with cascade fiber Bragg gratings (FBGs). The mode-locked laser emits rectangular pulses with width tunable from 2.8 to 23 ns under an increasing pump power at 1056.3 nm with 0.2-nm 30-dB linewidth. A polarization purity as high as 96% for the output transverse mode has been achieved simultaneously.
authors: Biao
authors: B
authors: Sun
authors: Anting
authors: A
authors: Wang
authors: Chun
authors: C
authors: Gu
authors: Guoliang
authors: G
authors: Chen
authors: Lixin
authors: L
authors: Xu
authors: Dick
authors: D
authors: Chung
authors: Qiwen
authors: Q
authors: Zhan