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

Abstract

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 laser is adjustable in a wide range from 100 GHz to 1 THz.

Description

technical field [0001] The invention belongs to the field of information and science technology, and in particular relates to a fiber microsphere cavity mode-locked laser based on a graphene channel structure. Background technique [0002] Because of its ultra-short pulse and ultra-high peak power, mode-locked lasers are widely used in laser rapid prototyping, laser spectroscopy, nonlinear optics, condensed matter physics, precision drilling, material processing, micromachining of optical crystals, etc. . In a free-running laser, many laser pulses with different modes or frequencies exist at the same time, and only when these laser modes are phase-locked with each other, can laser ultrashort pulses or mode-locked pulses be generated. There are many ways to achieve mode locking, but they can generally be divided into two categories: active mode locking and passive mode locking. [0003] At present, active mode-locked lasers periodically change the gain or loss of the laser ...

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Problems solved by technology

[0005] In view of the above-mentioned problems or deficiencies, in order to solve the problems that the existing mode-locked lasers cannot take into account the problems of simple structure, low cost, wide range of adjustment and stability; the present invention provides a fiber microsphere cavity mode-locked based on graphene channel structure Laser, through the integration of gold-graphene-gold heterostructure in the system of fiber microsphere mode-locked laser, under the dynamic control of external voltage, stable ultrashort pulse output with repetition frequency and wide range modulation can be realized

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