Robust mode-locking in all-fiber ultrafast laser by nanocavity of two-dimensional heterostructure.

ABSTRACT: The fiber-based saturable absorber (SA) that enables mode-locking within a ring cavity serves as the core component of the ultrafast all-fiber lasers. However, the integration of SAs onto fibers with high compactness suffers from imbalanced saturable absorption properties and unstable mode-locking performance. Here, we present a robust mode-locking SA by integrating a nanocavity composed of a two-dimensional graphene heterostructure on the fiber end facet. We demonstrate a significant reduction in the saturation intensity (~65%) and improved soliton dynamic processes through precise modulation of the optical field within the heterostructure. The designed heterostructure facilitates the formation of a stable single-soliton state for robust mode-locking. A high tolerance to intracavity polar

SUBMITTER: Shao J 

PROVIDER: S-EPMC12408808 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature