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  • Title: Three-dimensional Dirac semimetal thin-film absorber for broadband pulse generation in the near-infrared.
    Author: Meng Y, Zhu C, Li Y, Yuan X, Xiu F, Shi Y, Xu Y, Wang F.
    Journal: Opt Lett; 2018 Apr 01; 43(7):1503-1506. PubMed ID: 29601015.
    Abstract:
    In this Letter, the transient nonlinear absorption of three-dimensional (3D) topological Dirac semimetal Cd3As2 thin film was characterized in the near-infrared band. By performing broadband pump-probe measurements, we experimentally proved that molecular beam epitaxy (MBE) grown Cd3As2 exhibits strong and tunable saturable absorption effects across 1-2 μm. By further inserting the Cd3As2 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 Cd3As2 is a promising broadband saturable absorber (SA) for pulsed lasers in the infrared range.
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