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Multimode fiber (MMF) lasers are emerging as a remarkable testbed to study nonlinear spatiotemporal physics with potential applications spanning from high energy pulse generation, precision measurement to nonlinear microscopy. The underlying mechanism for the generation of ultrashort pulses, which can be understood as a spatiotempoal dissipative soliton (STDS), in the nonlinear multimode resonators is the spatiotemporal mode-locking (STML) with simultaneous synchronization of temporal and spatial modes. In this review, we first introduce the general principles of STML, with an emphasize on the STML dynamics with large intermode dispersion. Then, we present the recent progress of STML, including measurement techniques for STML, exotic nonlinear dynamics of STDS, and mode field engineering in MMF lasers. We conclude by outlining some perspectives that may advance STML in the near future.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10616099 | PMC |
http://dx.doi.org/10.1038/s41377-023-01305-0 | DOI Listing |
Spatiotemporal mode-locking (STML) in multi-mode fibers provides a novel approach, to our knowledge. to overcoming the power limitations of conventional single-mode lasers. However, the existing spatial filtering-based STML schemes are limited by the number of locked transverse modes, which severely constrains the power enhancement.
View Article and Find Full Text PDFNanophotonics
April 2025
Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel.
Ultrafast fibre lasers, characterized by ultrashort pulse duration and broad spectral bandwidth, have drawn significant attention due to their vast potential across a wide range of applications, from fundamental scientific to industrial processing and beyond. As dissipative nonlinear systems, ultrafast fibre lasers not only generate single solitons, but also exhibit various forms of spatiotemporal soliton bunching. Analogous to molecules composed of multiple atoms in chemistry, soliton molecules (SMs) - alias bound states - in ultrafast fibre lasers are a key concept for gaining a deeper understanding of nonlinear interaction and hold a promise for advancing high-capacity fibre-optic communications.
View Article and Find Full Text PDFOpt Express
January 2025
The flat-top beams have significant potential for applications in micromachining and biomedicine, due to their unique intensity distribution. Therefore, spatiotemporal flat-top beams, which are all flat-top in both spatial and time domains, may significantly advance its development. Here, we demonstrate the generation of a spatiotemporal flat-top beam using an all-fiber mode-locked laser.
View Article and Find Full Text PDFAn intelligent controlled spatiotemporal mode-locked (STML) fiber laser based on a photonic lantern (PL) is proposed and experimentally demonstrated. A pair of in-house developed PLs is spliced into the cavity in a back-to-back structure. This PL-based structure functions as a mode multiplexer/demultiplexer to generate higher-order spatial modes.
View Article and Find Full Text PDFMicromachines (Basel)
May 2024
Department of Electrical Electronic and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
In this article, we demonstrate a high-energy, wide-spectrum, spatiotemporal mode-locked (STML) fiber laser. Unlike traditional single-mode fiber lasers, STML fiber lasers theoretically enable mode-locking with various combinations of transverse modes. The laser can deliver two different STML pulse sequences with different pulse widths, spectra and beam profiles, due to the different compositions of transverse modes in the output pulses.
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