All fiber actively Q-switched Yb-doped laser with radially/azimuthally polarized beam generation. (11th July 2018)

• Record Type: Journal Article
• Authors: Wan, Hongdan; Wang, Jie; Shen, Zhiping; Chen, Yufang; Zhang, Zuxing; Wang, Peiyuan; Zhang, Lin
• Is Part Of: Laser physics letters. Volume 15:Number 9(2018:Sep.)
• Publication Date: 2018-07-11
• Subjects: fibre laser -- cylindrical vector beam -- Q-switch -- fused mode coupler; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aacb4b
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We demonstrate, for the first time to the best of our knowledge, an all fiber actively Q -switched Yb-doped laser generating cylindrical vector beams (CVBs) based on a fused mode coupler as the transverse mode converter and selector, and an acousto-optic modulator as the active Q -switching element. The radially and azimuthally polarized beams can be switched by adjusting the polarization controllers in the fiber ring cavity, with high mode purities measured to be >93.5%. Stable ns pulses with repetition rate from 30 Hz to 27 kHz were achieved near the wavelength of 1.0 μ m. The actively Q -switched CVB with a pulse width of 68 ns, a pulse energy of 3.46 μ J and a peak power of 50.1 W has been obtained when the repetition rate is 30 Hz and the pump power is 150 mW. This flexible Q -switched fiber laser with pulsed CVB output could find potential applications in the fields of materials processing, nonlinear optics and so on.