Dissipative pure-quartic solitons generation and evolution dynamics in a Mamyshev Oscillator

High-order dispersion can be utilized to enhance pulse energy emission from a fiber laser cavity, such as in the generation of pure-quartic solitons (PQSs) balanced by fourth-order dispersion (FOD) and Kerr nonlinearity. However, nonlinearity accumulation in the fiber laser cavity can easily induce pulse splitting, limiting pulse energy increase further. In this paper, we propose a theoretical model to investigate the generation and evolution of dissipative pure-quartic solitons (DPQSs) in an all-normal dispersion Mamyshev oscillator. We reveal that the significant interaction of positive FOD with nonlinearity, gain, and loss can assist in the stable generation of DPQS from a Mamyshev oscillator. We discover that the evolution of DPQSs in the proposed Mamyshev oscillator follows a principle whereby slight variations in net FOD, filter bandwidth, or small signal gain can significantly affect the pulse's temporal and frequency characteristics. Moreover, we find that the nonlinear relationship between pulse width and energy leads to a higher energy scaling ability of DPQSs compared to conventional dissipative solitons. Based on this model, we achieve versatile pulse emissions from the cavity, such as pulse duration, spectrum bandwidth, and single-pulse energy tunable. These results demonstrate that our proposed model not only provides a strategy for high-pulse energy generation but also offers a systematic solution for tailored-pulse emission, opening up further possibilities for widespread applications in science and technology.