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Abstract: topological insulator sb₂Te₃ has the advantage of broadband saturable absorption from the visible to the infrared bands. Herein, the two-dimensional material sb₂Te₃ saturable absorber (SA) of the topological insulator family was first applied experimentally in a wideband tunable passively Q-switched Yb-doped fiber laser. High-quality sb₂Te₃ crystals were synthesized by the flux zone method. The sb₂Te₃ SA with fewer layers was further prepared via a modified mechanical exfoliation procedure. Meanwhile, stable wavelength-tunable passive Q-switching pulse operation was obtained in a Yb-doped fiber ring cavity based on the sb₂Te₃ SA, where the central wavelength can be continuously tuned from 1040.89 to 1092.85 nm. Results suggest that sb₂Te₃ has wideband saturable absorption properties, and that the tunable pulse laser can provide a convenient and simple source for practical applications.

基于拓扑绝缘体Sb₂Te₃的52 nm宽谱可调谐被动调Q掺镱光纤激光器

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