An optical fiber microsphere cavity mode-locked laser based on graphene channel structure

The invention belongs to the field of information and science and technology, in particular to an optical fiber microsphere cavity mode-locked laser based on a graphene channel structure, comprising erbium-doped microspheres on the surface, multilayer graphene and micro-nano optical fibers. A surface erbium-doped microsphere is provided with two gold electrodes, and that multilayer graphene is adhered between the two gold electrodes on the sphere to form gold-graphene-heterogeneous structure of gold; micro-nano-fiber is attached to the surface of erbium-doped microspheres perpendicular to thecenter line of the sphere between the surface of erbium-doped microspheres and the surface of the microspheres to realize optical coupling with the surface of erbium-doped microspheres cavity. The mode-locked laser has the advantages of simple structure, low cost, wide range adjustability and stability. The single longitudinal mode linewidth is 1 kHz and the threshold is 20 microwatts. The repetition rate of the output la