Semi-open cavity random fiber laser with low threshold

Abstract

The invention discloses a semi-open cavity random fiber laser with a low threshold. An optical wave is coupled into a standard single mode fiber (6) from a front end by a pump source (1) of the semi-open cavity random fiber laser through a wavelength division multiplexer WDM (3). A common terminal (9) of the wavelength division multiplexer WDM (3) is connected with a high-reflectivity fiber grating (4) with a specific central wavelength. A feedback in the fiber laser is provided by a randomly distributed Rayleigh scattering (10) and a fiber grating feedback (5). A tail end (7) of the optical fiber is an output end of the laser. The semi-open cavity random fiber laser with a low threshold provided by the invention has characteristics such as tunable wavelength, multi-order random laser mixed output, and simple structure. The semi-open cavity random fiber laser with a low threshold provides a new development method for related optical devices and systems, and facilitates further promotion of the application of a feedback-randomly-distributed fiber laser in the fields of optical sensing and optical communication.

Description

technical field [0001] The invention relates to the field of novel fiber lasers, in particular to a semi-open-cavity low-threshold random fiber laser. Background technique [0002] Random laser is a new type of laser formed by multiple scattering amplification of light in a random gain medium. Because of its compact structure, small size and simple fabrication, it has attracted extensive attention in recent years. In order to improve the instability of the output direction and mode of random lasers, people use low-dimensional random system structures to make random fiber lasers with optical fibers as gain media, and use the waveguide structure of optical fibers to ensure the directionality of laser beams. [0003] As an important new light source, randomly distributed feedback fiber laser has broad potential application prospects in the fields of optical communication and optical sensing. However, due to the very weak Rayleigh scattering in the optical fiber, its operation s...

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Problems solved by technology

[0003] As an important new light source, randomly distributed feedback fiber laser has broad potential application prospects in the fields of optical communication and optical sensing. However, due to the very weak Rayleigh scattering in the optical fiber, its operation still requires a high threshold pumping Power, especially high-order random laser output is more difficult to achieve, which will affect the application of randomly distributed feedback fiber lasers to a certain extent

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