Recently, 2D layered MnBi2Te4 has been a promising candidate for discovering the exotic topological quantum phenomena for the coexisting topology and magnetism. In particular, the layered structure of MnBi2Te4 with a small bandgap possesses excellent ultrafast nonlinear response and broadband saturable absorption, which indicates that they can be applied in the field of ultrafast photonics. Despite tremendous research on magnetism and topology, the nonlinear optical properties of MnBi2Te4 have been underexplored. Herein, we have successfully synthesized the high-quality MnBi2Te4 by the self-flux method. By using MnBi2Te4 nanosheets as a saturable absorber (SA), a passive mode-locking erbium-doped fiber (EDF) laser centered at 1560 nm was obtained with a pulse duration of 331 fs. This work suggests that magnetic topological insulators possess great potential for ultrafast photonics.
Lead-free halide perovskite nanomaterials have aroused enormous attention and have been employed in many optoelectronic devices depending on their outstanding optical properties, especially their intrinsic stability. Regarding ultrafast fiber lasers, their high stability and low cost are crucial aspects of their industrial and scientific application. Thus, the high stable CsCu2I3 micro-rods are an ideal candidate for Saturable Absorbers (SA) in fiber laser systems. Herein, a passively mode-locked erbium-doped fiber laser based on CsCu2I3-SA was demonstrated operating at the communication band. To the best of our knowledge, the fiber laser could operate stably for over 164 days. These experimental results demonstrate that the CsCu2I3 micro-rods are ultra-stable and a promising optical modulation material to produce an ultrafast and long-stability pulse in fiber laser application.
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