High-power all-fiber wavelength-widely-tunable Tm3+-doped fiber laser Q-switched by TI-SA

A wavelength widely tunable all-fiber Tm3+-doped double clad fiber laser by using topological insulator (TI) as saturable absorber (SA), for the generation of large energy passively Q-switched pulse, is demonstrated. This 2 mu m fiber laser source can generate an average output power as high as 195 mW, corresponding to a pulse energy of similar to 3 mu J, and the laser wavelength can be widely tuned from 1935.42 to 2048.85 nm. This high-performance Q-switched operation is implemented by purpose laser cavity optimization and TI-SA protection. Overall, the above results can provide an easily accessible way to develop large energy wavelength tunable passively Q-switched 2 mu m fiber laser sources, which possesses important applications in various fields, including manufacturing, spectroscopy, medicine, and the military.