Photonics Research, 2019, 7 (1): 01000042, Published Online: Feb. 21, 2019
High-order mode lasing in all-FMF laser cavities Download: 716次
Abstract
We experimentally demonstrate two kinds of all few-mode fiber (FMF) ring lasers with high-order mode (HOM) oscillation in the laser cavity. One kind is a switchable-wavelength all-FMF HOM laser with an output of tunable optical vortex beams (OVBs); the other is a Q -switched all-FMF HOM laser with an output of pulsed cylindrical vector beams (CVBs). The lasers are composed of all-FMF components and few-mode erbium-doped fiber. A Sagnac interferometer made of a 3 dB FMF coupler functions as the wavelength selector, and switchable multiwavelength tunable OVBs are experimentally realized. Carbon nanotube-based saturable absorbers and the nonlinear polarization rotation technique are used to achieve Q -switched CVB lasers. This is the first report, to our knowledge, on the generation of switchable-wavelength and Q -switched HOM beams in all-FMF laser cavities.
Teng Wang, Ao Yang, Fan Shi, Yiping Huang, Jianxiang Wen, Xianglong Zeng. High-order mode lasing in all-FMF laser cavities[J]. Photonics Research, 2019, 7(1): 01000042.