Random-distribution feedback optical fiber laser

Abstract

The invention relates to a random-distribution feedback optical fiber laser which can realize stable, space-irrelevant and continuous laser output, and belongs to the technical field of the optical fiber laser. The random-distribution feedback optical fiber laser comprises a pump laser, a wavelength division multiplexer, a fiber bragg grating, an Er-doped optical fiber, an optical fiber Raman laser and a long monomode optical fiber. The reflection effect of the fiber bragg grating is combined with the distributed Rayleigh scattering effect of the optical fiber to form a distributed random feedback optical resonant cavity; and the light is subjected to gain amplification by an Er-doped optical fiber and the stimulated Raman scattering effect. Compared with the random-distribution feedback optical fiber laser reported before, the threshold value of the pump laser and the length of the monomode optical fiber can be reduced, and the limitation on stimulated emission wavelength and the wavelength number by a Rayleigh gain peak is broken through, thereby realizing the purpose of tuning the laser wavelength. The random-distribution feedback optical fiber laser is suitable for fields, such as remote optical fiber sensing, remote communication and the like.

Description

technical field [0001] The invention specifically relates to a randomly distributed feedback fiber laser, which belongs to the technical field of lasers. Background technique [0002] As a novel micro-laser, the random laser plays an irreplaceable role in many application fields, such as the light source of the flat panel display, the light source of the microstructure optical fiber, the signal light of the fluid detection, etc.; in addition, it has a compact structure and unique functions , therefore, more and more people study it. However, since the distribution of resonators in the medium is random, there are disadvantages such as complex pulse characteristics and the dependence of radiation on angles. Therefore, its spectral characteristics must be improved in some detection fields to challenge the excellent performance of traditional lasers. [0003] In recent years, people have used low-dimensional random system structures (such as optical fibers) to improve the abov...

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Problems solved by technology

It can provide spatially incoherent, continuous laser output without mode competition, but it has disadvantages such as high threshold power, low conversion efficiency, low output power and too long fiber length, and there are no related reports in China.

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