Abstract

We reported on the generation of pulse bunch and large-energy dark pulses in a mode-locked ytterbium-doped linear-cavity fiber laser based on ${\mathrm{Bi}}_2{\mathrm{Se}}_3$ as a saturable absorber (SA). ${\mathrm{Bi}}_2{\mathrm{Se}}_3$ nanosheets were successfully synthesized by the chemical vapor deposition (CVD) method and transferred to the end facet of a fiber connector for the proposed SA. Its saturation intensity and modulation depth were measured to be $52\mathrm{MW}/{\mathrm{cm}}^2$ and 14.5%, respectively. By inserting the ${\mathrm{Bi}}_2{\mathrm{Se}}_3$-based SA into the Yb-doped all-fiber linear cavity, stable pulse bunches were observed. In addition, dark soliton operation with a maximum average output power of 32.6 mW and a pulse energy of 61.8 nJ were also achieved. To the best of our knowledge, this is the first demonstration of a dark soliton within a linear cavity with much larger pulse energy than previous works. Our study fully indicated that $\mathrm{CVD}\text{-}{\mathrm{Bi}}_2{\mathrm{Se}}_3$ could be an excellent SA for achieving large-energy pulse operations.

© 2019 Optical Society of America

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