Fiber random raman laser based on fiber random grating

Abstract

The invention discloses an optical fiber random Raman laser based on an optical fiber random grating, which belongs to the technical field of optical fiber lasers, adopts a Fabry-Perot resonant cavity structure, and comprises a pump light source, a high-reflectivity grating, a wavelength division multiplexer, a Raman gain optical fiber and the optical fiber random grating. The high-reflectivity grating is connected to the reflecting end of the wavelength division multiplexer; the pump light source is connected with the input end of the wavelength division multiplexer; the Raman gain optical fiber is connected with the common end of the wavelength division multiplexer and the optical fiber random grating respectively; pump light enters the Raman gain optical fiber through the wavelength division multiplexer to be excited, a Raman gain effect is generated to enable gain of the pump light to be amplified, due to the random feedback effect of the optical fiber random grating, the gain light passing through the high-reflectivity grating can be amplified in the Raman gain optical fiber, and random laser beams are formed and output along with increase of pumping power. The laser provided by the invention has the characteristics of simple structure, low processing parameter requirements of key devices and the like, is easy to implement, and can obtain a low threshold and a high optical signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and more specifically relates to a fiber random Raman laser based on fiber random gratings. Background technique [0002] Fiber random lasers have the advantages of good directionality, light weight, high efficiency, and low threshold. At the same time, they have broad application prospects in many fields such as optical communication, optical fiber sensing, and speckle-free imaging. Compared with rare-earth-doped random fiber lasers that can only obtain output in certain wavelength windows, fiber random Raman lasers can change the random laser output wavelength by simply changing the wavelength of the pump light, and the entire transparent window of the fiber Both can generate random laser output. [0003] At present, fiber random Raman lasers are mainly divided into two categories according to the random feedback mechanism provided: [0004] (1) Rayleigh backscattering in the fiber is us...

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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a Fabry-Perot resonator structure fiber random Raman laser based on a fiber random grating, thereby solving the problem of providing random Raman lasers through Rayleigh scattering in the prior art. Technical Problems of High Threshold of Feedback Fiber Random Raman Laser

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