Half-open cavity type linear polarization and ultra-narrow linewidth multi-wavelength random fiber laser

Abstract

The invention provides a half-open cavity type linear polarization and ultra-narrow linewidth multi-wavelength random fiber laser. The structure of the random fiber laser comprises an overlapped fiber grating, a rare-earth doping gain fiber, a wavelength division multiplexer, a pumping laser source, a fiber on-line polarizer, a polarization-maintaining fiber ring, a polarization-maintaining fiber isolator and an overlapped fiber grating axial stress regulation device, wherein the overlapped fiber grating, the rare-earth doping gain fiber, the wavelength division multiplexer, the fiber on-line polarizer, the polarization-maintaining fiber ring and the polarization-maintaining fiber isolator are sequentially connected, a pumping light end of a dual-fiber end of the wavelength division multiplexer is connected with an output end of the pumping laser source, and an output end of the polarization-maintaining fiber isolator is used as a laser output port. By combining the overlapped fiber grating and polarization-maintaining fiber random distributed feedback, the multi-wavelength random fiber laser is achieved; and compared with a single-mode fiber random distributed feedback mechanism, the random fiber laser has the advantages that multi-wavelength random laser output with higher external interference resistant capability can be obtained, and the application of the random fiber laser in the field of a random fiber laser source requiring higher performance is achieved.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a semi-open-cavity linearly polarized and ultra-narrow linewidth multi-wavelength random fiber laser. Background technique [0002] Random lasers do not have a strict optical cavity structure, and their lasing is amplified by multiple distributed scattering of light waves in a random gain medium. Compared with traditional lasers, random lasers have many advantages, such as random radiation direction and intensity distribution, low pumping threshold, and narrow linewidth output. Random fiber laser (also known as random distributed feedback fiber laser) is a new type of fiber laser that has just been proposed in recent years (2010, published by Turitsyn et al. in the journal Nature Photonics), and it does not have a standard resonator , simple structure, continuous and stable output, long coherence distance, easy broadband continuous tuning, low cost, and better directivity than tradit...

AI Technical Summary

Problems solved by technology

However, using a long-length ordinary single-mode fiber as a randomly distributed feedback fiber is not strong enough to resist external disturbances, especially the changes in the polarization state of the fiber caused by external disturbances will cause fluctuations in the frequency and power of the output laser.

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