Triply coated fiber, pump combiner, fiber grating and fiber laser

Abstract

The invention is suitable for the optical field, and provides a triply coated fiber, a pump combiner, a fiber grating and a fiber laser. A triply coated passive fiber comprises a fiber core, an innercladding layer covering outside the fiber core, an outer cladding layer covering outside the inner cladding layer, and a coating layer covering outside the outer cladding layer, the diameter of the fiber core is 10-50micrometer, the diameter of the inner cladding layer is 250-800micrometer, the diameter of the outer cladding layer is greater than the diameter of the inner cladding layer, the diameter of the outer cladding layer is 300-1000micrometer, or, the diameter of the inner cladding layer is 80-100micrometer, and the diameter of the outer cladding layer is 110-130micrometer. In the triply coated passive fiber, the outer cladding layer wrapping outside the inner cladding layer greatly reduces damage of pump light to the organic coating, the coating as a full reflection interface has ultrahigh damage threshold, so that the fiber laser is more reliable and stable.

Description

technical field [0001] The invention belongs to the field of optics, and in particular relates to a triple-clad optical fiber, a pump beam combiner, a fiber grating and a fiber laser. Background technique [0002] Such as figure 1 As shown, the double-clad passive optical fiber of the prior art includes a core 101, a cladding 11 covering the outside of the core 101, and a coating 12 covering the outside of the cladding 11. The double-clad passive fiber of the prior art The diameter of the core 101 of the optical fiber is usually between 12-25 microns. [0003] Fiber laser is the third-generation fiber laser that uses fiber doped with rare earth ions as the gain medium. Related parameters such as the diameter of the fiber used in the fiber laser determine the poor stability and reliability of the fiber laser, and whether the target power can be achieved Key parameters, so the selection of these parameters is very critical. The pumping beam combiner and the fiber grating in...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a triple-clad optical fiber, a pump combiner, a fiber grating and a fiber laser, aiming to solve the problem of poor working stability and low reliability of the fiber laser due to the use of a double-clad passive fiber

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