Topological insulator Sb₂Te₃ has the advantage of broadband saturable absorption from the visible to the infrared bands. Herein, the two-dimensional material Sb₂Te₃ saturable absorber (SA) of the topological insulator family was first applied experimentally in a wideband tunable passively Q-switched Yb-doped fiber laser. High-quality Sb₂Te₃ crystals were synthesized by the flux zone method. The Sb₂Te₃ SA with fewer layers was further prepared via a modified mechanical exfoliation procedure. Meanwhile, stable wavelength-tunable passive Q-switching pulse operation was obtained in a Yb-doped fiber ring cavity based on the Sb₂Te₃ SA, where the central wavelength can be continuously tuned from 1040.89 to 1092.85 nm. Results suggest that Sb₂Te₃ has wideband saturable absorption properties, and that the tunable pulse laser can provide a convenient and simple source for practical applications.

拓扑绝缘体Sb ₂ Te ₃具有从可见光带到红外带的宽带可饱和吸收的优点。在此，首先将拓扑绝缘体族的二维材料Sb ₂ Te ₃饱和吸收体（SA）应用于宽带可调谐无源Q开关掺Yb光纤激光器。通量区法合成了高质量的Sb ₂ Te ₃晶体。通过改进的机械剥落步骤进一步制备了具有较少层的Sb ₂ Te ₃ SA。同时，在掺Y光纤环腔中，基于Sb，获得了稳定的波长可调无源Q开关脉冲工作。₂ Te ₃ SA，可将中心波长从1040.89连续调谐到1092.85 nm。结果表明，Sb ₂ Te ₃具有宽带饱和吸收特性，并且可调谐脉冲激光器可以为实际应用提供方便和简单的光源。