Ultra-narrow linewidth integrated fiber laser based on distributed external feedback

Abstract

The invention provides an ultra-narrow linewidth integrated fiber laser based on distributed external feedback, which comprises a fiber laser main cavity and a distributed external feedback structure, and is characterized in that the fiber laser main cavity generates main cavity laser under the excitation of a pumping source and provides the main cavity laser to the distributed external feedback structure; the distributed external feedback structure generates a distributed feedback signal according to the main cavity laser and reversely transmits the distributed feedback signal back to the optical fiber laser main cavity; and the distributed feedback signal carries out extreme regulation and control on the performance parameters of the main cavity laser, so that the main cavity of the fiber laser outputs single-longitudinal-mode ultra-narrow linewidth laser. The output of the single longitudinal mode laser and the compression of the line width do not depend on cavity length adjustment any more, performance parameters of the main cavity laser are regulated and controlled through distributed feedback signals, the output of the single longitudinal mode laser can be achieved, the line width can be extremely compressed, and the laser is simple in structure and low in cost. And the integrated miniaturization development of the laser is facilitated.

Description

technical field [0001] The invention belongs to the field of lasers, in particular to an ultra-narrow linewidth integrated fiber laser based on distributed external feedback. Background technique [0002] Narrow linewidth lasers have the characteristics of high beam quality and good frequency stability, which are very attractive in various advanced laser applications. Fields such as optical communication, optical precision measurement, and medical diagnosis all require highly coherent tunable lasers to optimize their parametric performance. In most cases, lasers with excellent monochromaticity are used to meet these needs. However, a large number of dense longitudinal mode oscillations are generated in the current gain spectrum of lasers, because the longitudinal mode interval is narrow, and the gain and loss differences between modes are small, so a large number of longitudinal modes are activated, and mode competition makes it difficult for lasers to achieve single longit...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an ultra-narrow linewidth integrated fiber laser based on distributed external feedback to solve the problem that it is difficult to achieve the ultimate compression of linewidth by using a single-cavity optical feedback linewidth compression method while the current laser realizes single longitudinal mode output.

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