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Single mode fiber (SMF) laser with large effective area by changing cladding index distribution

A technology of cladding refractive index and effective area, applied in the field of large effective area single-mode fiber lasers, can solve the problem that the single-mode and high-power lasers cannot have both, to reduce the maximum unit volume power, reduce loss, reduce The effect of normalizing frequencies

Inactive Publication Date: 2012-05-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that existing lasers cannot have both single-mode and high-power, the present invention provides a large effective area single-mode fiber laser by changing the refractive index distribution of the cladding

Method used

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  • Single mode fiber (SMF) laser with large effective area by changing cladding index distribution
  • Single mode fiber (SMF) laser with large effective area by changing cladding index distribution
  • Single mode fiber (SMF) laser with large effective area by changing cladding index distribution

Examples

Experimental program
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Effect test

Embodiment approach 1

[0027] Large effective area single-mode fiber lasers by changing the refractive index distribution of the cladding, such as figure 1 , 2 shown. The laser includes: an optical fiber, a first fiber grating 31 written at both ends of the fiber core 1 , a second fiber grating 32 , and a pumping source 5 .

[0028] The refractive index of the core 1 of the optical fiber is 1.6, and the refractive index of the cladding 2 is 1.4.

[0029] Use hydrofluoric acid solution to etch away the annular region between the first fiber grating 31 and the second fiber grating 32, the axial length is 1 mm, the thickness of the ring is 50 microns, and it is filled with quartz with a refractive index of 1.5 to form a filling District 4.

[0030] The distance between the first fiber grating 31 and the second fiber grating 32 is 50 cm.

[0031] The radius of the core 1 is 8 microns, the thickness of the cladding 2 is 50 microns, and the axial length of the filling region 4 is 1 mm.

[0032] The p...

Embodiment approach 2

[0034] A large effective area single-mode fiber laser with a D-shaped filling area by changing the refractive index distribution of the cladding, such as image 3 , 4 shown. The laser includes: an optical fiber, a first fiber grating 31 written at both ends of the fiber core 1 , a second fiber grating 32 , and a pumping source 5 .

[0035] The refractive index of the core 1 of the optical fiber is 1.9, and the refractive index of the cladding 2 is 1.7.

[0036] Use hydrofluoric acid solution to etch away the shape between the first fiber Bragg grating 31 and the second fiber Bragg grating 32. The shape is D-shaped, the chord height is 10 microns, and the axial length is 10 mm. Fill it with quartz with a refractive index of 1.8 to form a filling District 4.

[0037] The radius of the core 1 is 100 microns, and the thickness of the cladding 2 is 100 microns.

[0038] The distance between the first fiber grating 31 and the second fiber grating 32 is 5 meters.

[0039] The pu...

Embodiment approach 3

[0041] A large effective area single-mode fiber laser whose filling area is a helical rectangular groove by changing the refractive index distribution of the cladding, such as Figure 5 shown. The laser includes: an optical fiber, a first fiber grating 31 written at both ends of the fiber core 1 , a second fiber grating 32 , and a pumping source 5 .

[0042] The refractive index of the core 1 of the optical fiber is 1.8, and the refractive index of the cladding 2 is 1.6.

[0043] Corrode the filling area 4 between the first fiber grating 31 and the second fiber grating 32 with a hydrofluoric acid solution to form a spiral rectangular groove, the groove width is 10 microns, the pitch is 100 microns, and the groove depth is the thickness of the cladding 2, to refract Filled with quartz with a ratio of 1.7 to form the filled region 4 .

[0044] The radius of the core 1 is 50 microns, and the thickness of the cladding 2 is 80 microns.

[0045] The distance between the first fib...

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Abstract

The invention discloses a single mode fiber (SMF) laser with large effective area by changing cladding index distribution, which is applied to the field of fiber communication and industrial cutting. For the purpose of solving the problem that an existing laser can not realize single mode and high power simultaneously, the cladding index distribution condition of fibers in the laser is changed tochange transmission laser modes in a fiber core so as to realize large-mode-area (LMA) laser output under the condition of the single mode. The technical scheme is as follows: a hydrofluoric acid solution is utilized to etch off the claddings of fibers between a first fiber bragg grating (FBG) (31) and a second FBG (32), and quartz of which the refractive index is more than that of the claddings (2) or less than that of the fiber core (1) are filled so as to form a fill area (4). The fill area is of a D-shaped, ring-shaped, rectangle and spiral winding. The fiber laser is used for signal sources of the fiber communications or laser energy sources of a cutter in industrial processing.

Description

technical field [0001] The invention relates to a single-mode fiber laser with large effective area, which is suitable for optical fiber communication and industrial cutting. Background technique [0002] Since the advent of the laser, its good light characteristics have been widely recognized. With the development of technology, the power of the laser is increasing. The application of high-power special mode field lasers in parts processing, optical communication, and national defense is increasing. Get people's attention, its wide range of applications makes people invest more and more in this kind of laser. Although the power of the laser has been improved to a certain extent, the output power of the single-mode laser cannot meet the actual demand. There are difficulties in the production of single-mode high-power fiber lasers. The first reason is that the power that the laser resonator can withstand per unit volume is limited. The other is the effect of nonlinear effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/16
Inventor 宁提纲温晓东裴丽李晶郑晶晶冯素春
Owner BEIJING JIAOTONG UNIV
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