Intermediate state between dissipative soliton and amplifier similariton in ANDi ultrafast fiber

We make a theoretical demonstration of the transformation from the dissipative soliton to amplifier similariton in an all-normal dispersion fiber laser for the first time. An intermediate state between the dissipative soliton and amplifier similariton is proposed and we call it the “Dissipative similariton” considering its shaping mechanism and characteristics. Pulse regimes dynamics is thoroughly explored. The chirp evolution together with pulse structures in time and frequency domains can be used to distinguish the three pulse regimes. We think our work can enrich the pulse dynamics in all-normal dispersion fiber lasers and help one to design high-energy ultrashort pulse configurations.