Soliton metamorphosis dynamics in ultrafast fiber lasers

Abstract

The transitions from the incoherent noise to the coherent soliton have been fully revealed in ultrafast lasers. However, the soliton transformation between different coherent states, termed as soliton metamorphosis, remains an attractive yet uncharted territory. Here, we reveal the ultrafast dynamics of the soliton metamorphosis via single-shot spectroscopy in a specially designed fiber laser capable of emitting fast-switchable dissipative solitons and stretched pulses. It is demonstrated that the soliton metamorphosis is a consecutive evolution process including the self-phase modulation stage, pulse split stage, and transient stretched pulse stage. Particularly, the long-period pulse breathing and the spectral period doubling appear in the forepart and middle part of the last stage. The metamorphosis dynamics and soliton properties are substantiated by numerical simulation based on a three-step model. This work not only unveils the transient evolution physics of the pulse in soliton metamorphosis, but also provides a simple and effective way to control operations of ultrafast lasers.

Comprehensive analysis of pure-quartic soliton dynamics in a passively mode-locked fiber laser

“…4(i) and 4(j) shows that there is no complex interaction before the formation of stable PQS molecules, but eruption exists, which may be related to the intra-cavity large negative β pulsation at Ω g = 50 nm. Due to the fact that they are characterized by successive or periodic time shifts, spectrum fragmentation, and energy improvement, some researchers classify erupting traditional solitons as pulsating, [34][35][36]41,[43][44][45][46] but more researchers classify this as explosion. [47][48][49][50][51] Also, the time profile evolution of erupting PQSs in Figs.…”

GaSb Film is a Saturable Absorber for Dissipative Soliton Generation in a Fiber Laser

“…Ultrafast fiber lasers have garnered sustained and attractive attention for decades because of their extensive applications, including laser medicine, industrial processing, remote sensing, optical communication, and fundamental scientific research. − By regulating the dispersion and nonlinearity of their fiber cavities, fiber lasers have successfully generated stretched solitons, conventional solitons, dissipative solitons, and self-similar solitons. , Among these, dissipative solitons in fibers are the restricted wave packets of a laser, whose stability and existence rely heavily on the equilibrium of energy, which is based on the balance between loss and gain in the presence of large nonlinearity and normal dispersion . Dissipative solitons provide a good framework to understand the complexity of soliton pulse dynamics and stimulate the innovation of cavity designs, and ultrafast fiber lasers serve as a perfect platform for studying the concept of dissipative solitons and showing the distinct dynamics .…”