High-Power and Large-Energy Dissipative Soliton Resonance in a Compact Tm-Doped All-Fiber Laser

We report the direct generation of high-power and large-energy dissipative soliton resonance square pulses at 1940.8 nm from a compact mode-locked Tm-doped all-fiber laser. A fiber loop mirror of 10/90 splitting ratio and a fiber Bragg grating with high reflectivity of >99% constitute the cavity mirrors together. The fiber loop mirror not only acts as a broadband reflective mirror and output port but also initiates the mode-locked fiber laser. The strictly all-fiber structure and proper selection of fiber types allow the laser to work in a high pump power state. By increasing the pump power, pulse duration extends from 5.9 to 14.5 ns, while the pulse peak power and 3-dB spectrum bandwidth almost keep constant. At the maximum pump power of 13 W, we acquire maximum output average power of 1.98 W and single pulse energy of 684 nJ. To the best of our knowledge, this is the highest average output power and single pulse energy in an all-fiber Tm-doped mode-locked oscillator. At the same time, the output power is also a record value in all-fiber net anomalous dispersion oscillators.