Fig. 1. Schematic of the thulium-doped mode-locked fiber laser

Fig. 2. Time domain graphs of self-similar pulse. (a) Pulse evolution graph; (b) output monopulse and chirp curve; (c) change of pulse FWHM at different positions in the cavity

Fig. 3. Relationship between Δβ₂ and M²

Fig. 4. Shape fitting of laser output pulse

Fig. 5. Effect of L on different parameters of pulse. (a) Peak power of the pulse; (b) FWHM; (c) single pulse energy

Fig. 6. Effect of g₀ on different parameters of pulse. (a) Peak power of the pulse; (b) FWHM; (c) single pulse energy

Fig. 7. Chirp curve corresponding to different g₀ values