Numerical study of high-energy dissipative soliton generation in a 2.8μm mid-infrared ultrafast fiber laser

Mid-infrared mode-locked fiber lasers are highly desirable for advanced applications but face limitations in scaling pulse energy. This work presents a theoretical demonstration of a high-energy laser design that employs an As₂S₃ fiber for integrated dispersion and nonlinearity management in an Er³⁺:ZBLAN fiber laser. The exceptional properties of As₂S₃ fiber, including its large normal dispersion and high nonlinearity, are leveraged for precise cavity control. Through numerical simulations and parameter exploration, a net normal dispersion cavity is engineered to support dissipative soliton operation. The proposed design enables stable dissipative soliton generation at 2.8μm, delivering a calculated pulse energy of 528.49 nJ and a dechirped pulse width of 380.15 fs. Furthermore, our model predicts, for the first time, the existence of a noise-like pulse regime in the mid-infrared spectrum under net normal dispersion conditions. This theoretical study establishes the As₂S₃ fiber as a versatile component for exploring high-energy ultrafast dynamics and providing insight into the dynamics of high-energy mid-infrared pulses.