Ultra-Narrow Linewidth Lasers

Abstract

The invention provides an ultra-narrow line width laser device. The laser device comprises a laser-generating gain device, an optical coupler, and two feedback compression devices, wherein the laser-generating gain device is connected to the one end of the optical coupler, and the other end of the optical coupler is connected with output optical fibers and the feedback compression devices. By designing cavity lengths and a cavity length difference value of the feedback compression devices, single longitudinal mode narrow line-width laser output is obtained, and a side-mode suppression ratio of output lasers is improved; generated lasers of preset quantity are transmitted to the optical coupler by the laser-generating gain device, and the lasers are transmitted to the corresponding feedback compression devices by the optical coupler; each feedback compression device narrows incident layer line width, and the narrowed laser line width is transmitted back to the laser-generating gain device by the optical coupler to be subjected to gain amplification; after gain amplification, the lasers go through the optical coupler and is transmitted to the feedback compression devices to circularly narrow the laser line width till the lasers of preset quantity are all transmitted out through the output optical fibers.

Description

technical field [0001] The invention belongs to the field of laser generating devices, and in particular relates to an ultra-narrow linewidth laser. Background technique [0002] The single longitudinal mode laser beam with narrow linewidth is a high-quality laser with extremely low phase noise and ultra-long coherence length, and has broad application prospects in the fields of optical fiber sensing, optical fiber communication, lidar, and distributed oil pipeline detection. . As we all know, single longitudinal mode lasers have been widely used in many fields due to their small size, mature production technology, and low cost. However, their linewidth limits their application in optical fiber distributed sensing, optical coherent communication, laser radar, etc. The application of optical coherent systems (especially DFB lasers, whose linewidth is generally on the order of MHz or hundreds of kHz), because the performance parameters of these optical coherent systems, such ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an ultra-narrow linewidth laser to solve the problem that it is difficult to realize laser single longitudinal mode output while further compressing the linewidth existing in the current optical self-injection feedback linewidth compression method

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