Ultrahigh-Repetition-Rate Pulse in a Dissipative Fiber Ring Cavity by Ultrafast Ignition

In this paper, we propose a novel mechanism for ultrahigh repetition rate pulse (UHRP) formation by ultrafast ignition, termed the ultrafast pulse-stimulated four-wave mixing effect in a dissipative ring fiber laser. By employing an ultrafast seeded pulse to initiate a pulse field within a dispersion-managed fiber ring cavity, we stimulate the fourwave mixing effect using a comb filter within the cavity. Through numerical simulations, we achieved UHRPs with a repetition frequency of 275 GHz. The transition from ultrafast pulse to UHRP was monitored in real-time through simulations. Experimental results confirmed the formation of UHRPs via ultrafast ignition of four-wave mixing in a dissipative ring fiber cavity, with the output power reaching up to half a watt.