2 [mu] m wave band column vector optical fiber random laser based on optical fiber random grating

Abstract

The invention discloses a 2 [mu] m wave band column vector optical fiber random laser based on an optical fiber random grating. The laser uses a thulium-doped optical fiber as a gain medium, uses the optical fiber random grating to provide optical random distribution feedback, uses an optical mode converter to convert part of fundamental mode light into LP11 mode column vector light, and uses the few-mode fiber bragg grating to achieve high-proportion reflection of fundamental mode light and total transmission of LP11 mode light, and therefore, column vector random laser output of the 2-micrometer wave band is achieved.

Description

technical field [0001] The present application relates to the technical field of lasers, in particular to a 2 μm band cylindrical vector fiber random laser based on a fiber random grating. Background technique [0002] The 2μm band laser has important application value and irreplaceable role in many fields such as optical communication, medical treatment and military affairs. [0003] Because fiber random lasers are different from ordinary fiber lasers, their resonant cavity has no fixed cavity length, has the advantages of low coherence, simple structure, and easy maintenance, and can be applied in the field of microscopic imaging. [0004] Fiber random lasers can be divided into Rayleigh scattering distribution feedback type, filling type and fiber random grating feedback type according to different feedback types. Fiber random lasers based on fiber random grating feedback form randomly distributed optical feedback by randomly writing fiber gratings on the fiber. Compared...

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Problems solved by technology

[0006] 2μm band fiber laser, fiber random laser and fiber column vector laser are different directions of fiber laser research. The advantages of the three lasers are different, but there is no report on column vector random fiber laser in the 2μm band.

[0010] Therefore, the current technology only has the output of 2μm band random laser or the output of cylindrical vector light, but it has not achieved the output of 2μm band cylindrical vector random laser at the same time.

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