Abstract

In this work, we report about high energy and various solitons’ operation by using high-efficiency topological insulator bismuth telluride (${\rm Bi}_2{\rm Te}_3$) nanofilms as broadband saturable absorbers in the passively mode-locked Er-doped fiber laser. The ${\rm Bi}_2{\rm Te}_3$ film was successfully synthesized by chemical vapor deposition (CVD). Excellent characteristics of the dark–bright pulse pairs, bright pulses, and multiharmonics have been investigated experimentally by adjusting the polarization state. At the same time, the maximum average output power was 40.18 mW, and the single-pulse energy was 20.91 nJ. As we all know, it is the various solitons of the first generation with large pulse energy in an Er-doped fiber laser with ${\rm Bi}_2{\rm Te}_3$ as saturable absorber. The experimental results show that CVD ${\rm Bi}_2{\rm Te}_3$ can be used as an excellent candidate in mode-locked fiber lasers.

© 2020 Optical Society of America

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