Abstract
Demonstrations of dual-wavelength Q-switched fiber lasers in the wavelength regions of 1.0μm and 1.55μm have been widely reported but not in the longer wavelength of 2.0μm region. In this paper, a dual-wavelength Q-switched thulium-doped fiber laser is proposed and demonstrated using an N-doped graphene film as the saturable absorber, while the dual-wavelength mechanism is achieved with the use of a tunable Mach-Zehnder filter. The dual-wavelength Q-switched laser produced consistent outputs at 1922.0nm and 1961.0nm with a wavelength spacing of 39.0nm. The repetition rate of the pulses obtained covers a range from 17.68kHz to 35.21kHz corresponding to an increasing pump power of 112.55mW until 147.78mW. The narrowest pulse width obtained is 4.4μs and a pulse energy as high as 25.56nJ is generated. To the best of our knowledge, this is the first demonstration of a dual‐wavelength Q-switched thulium-doped fiber laser operating in the 2.0μm wavelength region using a fiber ring cavity design.
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