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We first reported that the topological insulator (TI) nanosheets solution filled in photonic crystal fiber can operate as an effective saturable absorber (SA) with the merits of low-insertion loss ($\sim 0.42$ dB), long interaction length (>10 cm), and high-power tolerance. This SA device exhibited a saturable intensity of 14.9 MW/$\mathrm{cm}^{2}$ , modulation depth of 19.1%, and nonsaturable...
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