We report the spatiotemporal mode-locked multimode fiber laser operating at 1.55 µm based on semiconductor saturable absorber mirrors with the mode-locking threshold as low as 104 mW. Benefiting from the multimode interference filtering effect introduced in the laser cavity not only the central wavelength can be continuously tuned from 1557 nm to 1567 nm, but also the number of the output pulses can be adjusted from 1 to 4 by simply adjusting the polarization controllers. This work provides a new platform for exploring the dynamic characteristics of spatiotemporal mode-locked pulses at negative dispersion regime. Moreover, this kind of tunable laser has potential applications in fields of all-optical signal processing, fiber sensing and information coding.
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This paper presents the experimental observation of the transition from stationary spatiotemporal soliton (STS) to spatiotemporal soliton pulsation (STSP) in spatiotemporal mode-locked fiber lasers for the first time. Three STSs maintain an asynchronous pulsating state with the same period, while another STS remains in a stationary mode-locked state. Through numerical analysis, the dynamic transition process of STS to STSP is studied.
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