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 ...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.展开更多
基金National Natural Science Foundation of China(NSFC)(61635006,91750108,61520106014)Science and Technology Commission of Shanghai Municipality(STCSM)(16520720900)
文摘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.
