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A Cascaded Gain-Guided-Refractive Index Anti-Guide Large Mode Field Fiber Laser

A technology of fiber laser and gain fiber, which is applied in the direction of lasers, laser parts, phonon exciters, etc., can solve the problem of limited length of gain medium, achieve the effect of increasing length and output power, reducing loss and increasing length

Inactive Publication Date: 2016-08-17
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to propose a cascaded gain-guiding-refractive index anti-guiding large-mode-field fiber laser to solve the problem of limited length of gain medium in this type of fiber laser

Method used

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  • A Cascaded Gain-Guided-Refractive Index Anti-Guide Large Mode Field Fiber Laser
  • A Cascaded Gain-Guided-Refractive Index Anti-Guide Large Mode Field Fiber Laser
  • A Cascaded Gain-Guided-Refractive Index Anti-Guide Large Mode Field Fiber Laser

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Experimental program
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Effect test

Embodiment 1

[0024] The cascaded gain-guided refractive index anti-guided large-mode-field fiber laser proposed by the present invention is as follows:

[0025] The metal plate 1 is made of a copper plate, and five parallel V-shaped grooves are precisely made on the copper plate. The groove depth is 180 microns, the length is 10 cm, and the distance is 5 cm. Put 5 sections of gain optical fiber 2 with a length of 10 cm in the V-shaped groove , and filled and fixed with heat-conducting silica gel; and then 4 sections of light-guiding fiber 3 and gain fiber 2 are connected by fusion splicing technology, thereby forming a cascaded optical fiber that is connected with 5 sections of gain fiber and 4 sections of light-guiding fiber at intervals; One end of the cascade optical fiber is placed with a total reflection mirror 4, and the reflectivity is 100% at a wavelength of 1050nm. A laser output mirror 5 is placed at the other end of the cascade optical fiber, and the reflectivity is 90% at a wave...

Embodiment 2

[0033] The cascaded gain-guided refractive index anti-guided large-mode-field fiber laser proposed by the present invention is as follows:

[0034] The metal plate 1 is made of a copper plate, and five parallel V-shaped grooves are precisely made on the copper plate. The groove depth is 350 microns, the length is 10 cm, and the distance is 5 cm. Put 5 sections of gain optical fiber 2 with a length of 10 cm in the V-shaped groove , and filled and fixed with heat-conducting silica gel; and then 4 sections of light-guiding fiber 3 and gain fiber 2 are connected by fusion splicing technology, thereby forming a cascaded optical fiber that is connected with 5 sections of gain fiber and 4 sections of light-guiding fiber at intervals; One end of the cascaded optical fiber is placed with a total reflection mirror 4, the reflectivity is 100% at the wavelength of 1060nm, and the laser output mirror 5 is placed at the other end of the cascaded optical fiber, the reflectivity is 90% at the ...

Embodiment 3

[0041] The cascaded gain-guided refractive index anti-guided large-mode-field fiber laser proposed by the present invention is as follows:

[0042] The metal plate 1 is made of an aluminum plate, and 10 parallel V-shaped grooves are precisely made on the aluminum plate. The groove depth is 350 microns, the length is 10 cm, and the distance is 3 cm. Put 10 sections of gain fiber 2 with a length of 10 cm in the V-shaped groove , and filled with heat-conducting silica gel and fixed; and then 9 sections of light-guiding fiber 3 and gain fiber 2 are connected by fusion splicing technology, thereby forming a cascaded optical fiber that is connected with 10 sections of gain fiber and 9 sections of light-guiding fiber at intervals; One end of the cascaded optical fiber is placed with a total reflection mirror 4, and the reflectivity is 100% at the wavelength of 1550nm, and the laser output mirror 5 is placed at the other end of the cascaded optical fiber, and the reflectivity is 90% at...

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Abstract

The invention provides a cascading gain guidance and refractive index reverse guidance large mode field optical fiber laser. By means of the laser, the length of a gain guidance and a refractive index reverse guidance large mode field optical fiber is effectively increased, and size and convenience of a device are guaranteed; each section of the gain optical fiber is welded and connected through a light guidance optical fiber, the coupling efficiency of light is improved, and light loss in a resonant cavity is reduced; an independent pump source and an independent convergent lens are adopted in each section of the gain optical fiber, so that uniformity and pumping efficiency of the pump light are improved; expandability is achieved in the cascading number of the gain optical fiber of the optical fiber laser of the structure, so that the length of the gain medium and the output power of the optical fiber laser of the type can be further improved. Through the cascading gain guidance and refractive index reverse guidance large mode field optical fiber laser, an effective method for improving the power of optical fiber laser of the type is provided.

Description

technical field [0001] The invention relates to a cascaded gain-guiding-refractive index anti-guiding large-mode-field fiber laser, which belongs to the technical field of fiber lasers and fiber amplifiers. Background technique [0002] High-power fiber lasers and amplifiers have many potential commercial and military applications, but in traditional single-mode fibers, the nonlinear optical effects caused by high power and optical damage to the fiber end face become limitations to further increase the power of lasers and amplifiers The main obstacle, and the most direct way to solve this problem is to reduce the optical power density by increasing the mode field area. At present, the core diameter of traditional single-mode fiber lasers can reach 40 μm, and the core diameter can reach 100 μm by designing photonic crystal fibers. Other design methods to increase the mode field area mainly include: mode conversion method, chiral coupling core fiber method, bending Loss manag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/07H01S3/091H01S3/08
Inventor 韦玮沈骁杨涛其他发明人请求不公开姓名
Owner NANJING UNIV OF POSTS & TELECOMM