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We investigate the buildup dynamics of broadband Q-switched noise-like pulse(QS-NLP) driven by slow gain dynamics in a microfiber-based passivelymode-locked fiber laser. Based on shot-to-shot tracing of the transient opticalspectra and qualitatively reproduced numerial simulation, we demonstrate thatslow gain dynamics is deeply involved in the onset of such complex temporal andspectral instabilities of QS-NLP. The proposed gain dynamics model couldcontribute to deeper insight into such nonlinear phenomenon and transientdynamics simulation in ultrafast fiber laser.

Buildup dynamics of broadband Q-switched noise-like pulse