Noise suppression device of a fiber laser based on a double fiber ring filter

Abstract

The invention discloses a fiber laser noise suppression device based on a double fiber ring filter, which comprises a constant temperature vibration isolation shell, a fiber laser arranged in the constant temperature vibration isolation shell, a double fiber ring filter, a Bragg grating and a grating coupler. The double optical fiber ring filter is coupled into a double optical fiber ring structure by a first optical fiber ring and a second optical fiber ring through a grating coupler, The first optical fiber ring of the double optical fiber ring filter comprises a first port and a second port, wherein the first port is connected with the optical fiber laser, and the second port is an output port of the low-noise laser processed by the device; The Bragg grating consists of a Bragg gratingwhich is photolithographically etched on an optical fiber and is welded to a second optical fiber ring of the dual optical fiber ring filter. The invention realizes the laser noise suppression throughthe slow light effect of the double optical fiber ring filter to increase the photon lifetime in the cavity, the whole structure is simple and there is no photoelectric conversion module, and the whole suppression bandwidth is greatly improved.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a fiber laser noise suppression device based on a double-fiber ring filter. Background technique [0002] In recent years, fiber laser technology has developed rapidly, the performance of fiber laser has been continuously improved, and its application has become more and more extensive. Due to its advantages of small size, narrow line width, and convenient use, fiber lasers are widely used in fiber optic sensing, lidar, high-resolution laser spectroscopy, and other fields. These application areas have high requirements on the reliability and noise characteristics of fiber lasers. The level of free light noise in general fiber lasers is difficult to meet the requirements of applications in related high-tech fields. Therefore, it is of great significance to take further technical measures to suppress the output laser noise in the fiber laser, and to study the characteristics of related technologi...

AI Technical Summary

Problems solved by technology

[0004] 1. Since the feedback is completed by electrical signals, the response of electrical signals is much slower than that of optical signals, which is limited by the bandwidth of the feedback response and cannot suppress the high-frequency noise of the laser

[0005] 2. Requires complex feedback circuits and various servo feedback electrical components

However, this fiber laser noise suppression technology based on a single-loop filter is limited by the principle of the scheme itself. The filter itself is multi-mode operation, so when it is used for fiber laser noise suppression, it is easy to cause mode hopping of the outgoing laser , affecting its application in related fields

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