Wavelength and duration tunable dissipative soliton resonance fibre laser

We report on a wavelength and duration tunable mode-locked Yb-doped fibre laser operating in a dissipative soliton resonance (DSR) regime at a sub-megahertz repetition rate. The DSR regime has the advantage of avoiding pulse splitting. Hence, it is suitable for obtaining a high output pulse energy. In the experiment, by extending the cavity length to 219.36 meters, a DSR pulse output with a repetition rate of 923 kHz is achieved. For the case of the DSR operating at 1032 nm, the maximum single-pulse energy is 113 nJ. The output pulse duration can be changed from 389 ps to 1.25 ns by controlling the pump power. A wavelength-tuned range of 73 nm (1007–1080 nm) is further realized by adjusting the intra-cavity spectral filter. (paper)