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Dispersive Fourier transform (TS-DFT) technique opens a fascinating pathwayto explore the ultrafast non-repetitive even, which has been employed to studythe build-up process of mode-locked lasers. Here the whole evolution dynamics(from starting up to shutting down) of conventional soliton (CS), stretchedpulse (SP) and dissipative soliton (DS) are investigated by using TS-DFTtechnique. The relaxation oscillation can be always observed before theformation of stable pulse operation, which is stemmed from the inherentadvantage of the single-walled carbon nanotube. However, owing to the differentpulse features, they exhibit the distinct evolution dynamics in the startingand shutting processes. Some critical phenomena are observed, includingtransient complex spectrum broadening and frequency-shift interaction of SP andpicosecond pulses. These results could further deepen the understanding of themode-locked fiber laser from the real-time point of view and is helpful for thelaser design and applications.

Observation of the evolution dynamics from starting to shutting of SWNT-mode-locked fiber laser