▎ 摘　　要

NOVELTY - The optical fiber laser has a semiconductor laser (1) and coupling lens (2). A dichroic mirror (3) is located in coupling lens. A zirconium barium lanthanum aluminium natrium (ZBLAN) optical fiber (6) is provided with an optical fiber Bragg grating (FBG) (4). One end of ZBLAN optical fiber is provided with a broadband reflecting mirror (8) and other end is provided with graphene thin film (7). USE - Middle-infrared cascade pulsed optical fiber laser. ADVANTAGE - The optical fiber laser has simple structure, convenient operation, high portability and can be manufactured with reduced cost. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the middle-infrared cascade pulsed optical fiber laser. Semiconductor laser (1) Coupling lens (2) Dichronic mirror (3) FBG (4) ZBLAN optical fiber (6) Graphene thin film (7) Broadband reflecting mirror (8)