Ultra-narrow line width optical fiber laser device based on Rayleigh scattering and stimulated brillouin scattering

Abstract

The invention provides an ultra-narrow-line-width optical fiber laser device based on Rayleigh scattering and stimulated brillouin scattering. The ultra-narrow-line-width optical fiber laser device is innovatively characterized by being composed of a light source, a first three-port circulator, a Rayleigh scattering optical fiber, a polarization controller, a second three-port circulator, a Rayleigh scattering optical fiber and a Bragg optical fiber optical grating. The ultra-narrow-line-width optical fiber laser device has the beneficial effects that the ultra-narrow-line-width optical fiber laser device has a simple structure and has double compression effect on line width of brillouin scattering light, so that the ultra-narrow-line-width brillouin scattering light can be output.

Description

technical field [0001] The invention relates to a laser output line width compression technology, in particular to an ultra-narrow line width fiber laser based on Rayleigh scattering and stimulated Brillouin scattering. Background technique [0002] The single longitudinal mode laser beam with ultra-narrow linewidth is a high-quality light source with extremely low phase noise and ultra-long coherence length. It has broad applications in the fields of optical fiber sensing, optical fiber communication, laser radar, and distributed oil pipeline detection. prospect. [0003] In the prior art, there are various methods for forming ultra-narrow linewidth single longitudinal mode laser beams, such as short-cavity methods, saturable absorbers, multi-ring ring cavities, etc., but most of the lasers based on the aforementioned methods have complex structures, The defects of large volume, high cost, and unsatisfactory linewidth compression effect greatly limit the application of ult...

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Problems solved by technology

[0003] In the prior art, there are various methods for forming ultra-narrow linewidth single longitudinal mode laser beams, such as short-cavity methods, saturable absorbers, multi-ring ring cavities, etc., but most of the lasers based on the aforementioned methods have complex structures, The defects of large volume, high cost, and unsatisfactory linewidth compression effect greatly limit the application of ultra-narrow linewidth single longitudinal mode laser beams

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