Abstract
In this Letter, the transient nonlinear absorption of three-dimensional (3D) topological Dirac semimetal thin film was characterized in the near-infrared band. By performing broadband pump–probe measurements, we experimentally proved that molecular beam epitaxy (MBE) grown exhibits strong and tunable saturable absorption effects across 1–2 μm. By further inserting the film into the cavities of Tm- and Er-doped fiber lasers, we obtained stable mode-locked operations at 1.96 and 1.56 μm. Our results experimentally establish that is a promising broadband saturable absorber (SA) for pulsed lasers in the infrared range.
© 2018 Optical Society of America
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