Energy scalability of the dissipative soliton in an all-normal-dispersion fiber laser with nonlinear amplifying loop mirror

Abstract We numerically and experimentally report on a high-energy all-normal-dispersion Yb-doped fiber laser with a nonlinear amplifying loop mirror (NALM) acting as the mode-locker. Numerical simulations of the dynamic evolution of dissipative solitons in this structure indicate that the position of gain fiber in the loop mirror plays a key role in promoting pulse energy. Without significant Raman scattering effect, pulse trains with energy and average output power of 22 nJ and 191 mW, respectively, whose duration can be de-chirped to 195 fs, were experimentally obtained from the all-PM-fiber cavity. In addition, the multi-pulsing phenomena at different positions of gain fiber in the loop mirror limits the further increasing of the pulse energy. In this paper, both simulation and experiment are in good qualitative agreement, which provides a method for the mode-locked fiber laser with NALM to control and improve the output properties.