Abstract

Passive mode-locked fiber laser (PMLFL) based on low-dimensional nano-material saturable absorber (SA) is one of the hot research directions of mode-locked fiber laser at present because of its simple structure, low cost, and femtosecond ultra-short pulse generation [1]. In recent years, more and more kinds of nanomaterials have been proved to have good physical and optical properties, and can be used as new saturable absorbers. Among them, the heterojunction structure based on two-dimensional (2D) materials has aroused great interest. The construction of heterojunction structure includes the combination of different two-dimensional materials and two-dimensional materials with low-dimensional materials, such as 1D and 3D bulk materials [2]. The heterojunction structure formed by the weak van der Waals force between layers can obtain better optical properties based on the initial properties of a single material, and achieve the performance that a single material cannot achieve. In our work, heterojunction structure saturable absorbers based on three low-dimensional materials have been prepared for the first time and applied to PMLFL. Experiments show that the SA has low mode-locking threshold, good stability and long service life, and can be applied to multiple bands. Our work is expected to provide guidance for the research of low-dimensional nanomaterial SA and ultrafast fiber lasers.

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