We demonstrated a 2080 nm long-wavelength mode-locked Tm-doped fiber laser operating in the dissipative soliton resonance (DSR) regime. The compact all-fiber dumbbell-shaped laser is simply constructed by a 50/50 fiber loop mirror (FLM), a 10/90 FLM and a piece of large-gain Tm-doped double-clad fiber pumped by a 793 nm laser diode. The 10/90 FLM is not only used as an output mirror, but also acts as a periodical saturable absorber for initiating DSR mode locking. The stable DSR pulses are generated at the center wavelength as long as 2080.4 nm, and the pulse duration can be tunable from 780 ps to 3240 ps as the pump power is increased. The maximum average output power is 1.27 W, corresponding to a pulse energy of 290 nJ and a nearly constant peak power of 93 W. This is, to the best of our knowledge, the longest wavelength for DSR operation in mode-locked fiber laser.
Wang Hua, Du Tuanjie, Li Yanhong, Zou Jinhai, Wang Kaijie, Zheng Fuyong, Fu Junfeng, Yang Jihai, Fu Hongyan, Luo Zhengqian. 2080 nm long-wavelength, high-power dissipative soliton resonance in a dumbbell-shaped Tm-doped fiber laser[J]. Chinese Optics Letters, 2019, 17(3): .
