Double covered optical fiber side-pumping coupler grating and realization method thereof

A double-clad fiber, side-pumped technology, applied in the direction of clad fiber, multi-layer core/clad fiber, optical waveguide coupling, etc., can solve the problems of high implementation cost, complex process, low coupling efficiency, etc. Achieve the effect of economical processing cost, simple process and high conversion efficiency

Inactive Publication Date: 2009-04-22
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention solves the problems of low coupling efficiency, high implementation cost, and relatively complicated process when pumping double-clad doped optical fibers by the side of an LD array, so as to realize high-power doped fiber lasers and optical fibers with simple process, high efficiency and low cost. The optical fiber side coupling structure and coupling method of the amplifier provide the possibility of making high-power laser weapons

Method used

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  • Double covered optical fiber side-pumping coupler grating and realization method thereof
  • Double covered optical fiber side-pumping coupler grating and realization method thereof
  • Double covered optical fiber side-pumping coupler grating and realization method thereof

Examples

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Embodiment 1

[0029] A laser diode array double-clad fiber side-pumped coupled volume grating, the cross-section along the axis is as follows image 3 shown. On the surface of the rectangular inner cladding 2 of the double-clad optical fiber, in the direction perpendicular to the double-clad optical fiber, there is a group of parallel and closely arranged isosceles triangular transverse grooves 4 with the same structure, and the slope surface of the isosceles triangular transverse groove 4 Angle α is not less than , the width H of the isosceles triangular transverse groove 4 is equal to

[0030] The double-clad doped fiber uses a polymer outer cladding, and the refractive index of the material of the polymer outer cladding 1 is n 3 is 1.37, the refractive index n of the rectangular inner cladding 2 material 2 is 1.444, the refractive index n of the core 3 material 1 is 1.45, and the pump laser wavelength λ is 975 nm. Such as figure 1 , 2 , 3, the laser diode array double-clad fibe...

Embodiment 2

[0035] A laser diode array microstructure double-clad fiber side-pumped dielectric film coupled volume grating, the cross-section along the axis is as follows Figure 5 shown. On the surface of the D-shaped inner cladding 2 of the microstructured double-clad optical fiber, in the direction perpendicular to the double-clad optical fiber, there is a group of parallel and closely arranged isosceles triangular transverse grooves 4 with the same structure, and the isosceles triangular transverse grooves 4 slope angle α is not less than , the width H of the isosceles triangular transverse groove 4 is equal to λ n 2 sin 2 α .

[0036] The realization of a laser diode array microstructure double-clad fiber side-pumped dielectric film-coupled volume grating, such as figure 1 , 2 , 3, and 4 show that the double-clad doped fiber adopts...

Embodiment 3

[0041] A multiple laser diode array double-clad fiber side-pumped coupled volume grating group, the cross-section along the axis is as follows Figure 8 shown. On the surface of the octagonal inner cladding 2 of the double-clad optical fiber, in the direction perpendicular to the double-clad optical fiber, there are multiple sets of parallel and closely arranged isosceles triangular transverse grooves 4 with the same structure, and isosceles triangular transverse grooves 4 The slope angle α is not less than , the width H of the isosceles triangular transverse groove 4 is equal to . This coupling structure can be used to make fiber lasers and amplifiers of thousands of watts or even 10,000 watts. Such as Figure 6 , 7 , 8 shown.

[0042] The implementation of the multiple laser diode array double-clad fiber side-pumped coupled bulk grating group, such as Figure 6 , 7 , 8, the refractive index n of the polymer outer cladding 3 material of the quartz double-clad doped ...

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Abstract

This invention relates to one double coverage layer fiber side pump coupler grating, which comprises the following parts: inner package layer with one set of isosceles triangle level tanks with same structure parallel and tightly distributed with same length with LD array slow axis; the tank slope angle is more than sin-1n0 / n2 with width H equal to lambada / n2sin2alpha. The method comprises the following steps: removing outer package layer; etching the inner package layer as process type; polishing the tank and coating the medium film to form inner coverage coupler grating.

Description

technical field [0001] The invention relates to a side-pumped coupling structure of a high-power double-clad fiber laser and a realization method thereof, in particular to a side-pumped coupling body grating of a double-clad fiber and a realization method thereof, belonging to the technical field of special optical fibers. Background technique [0002] High-power double-clad lasers and amplifiers have crucial applications in national defense, industrial advanced laser manufacturing, precision welding, and laser radar. The pump source for such high-power double-clad lasers and amplifiers is generally a laser diode array. Therefore, how to efficiently couple the pump light of the laser diode array into the double-clad fiber has become the technical key to making high-power lasers and amplifiers. [0003] As the core technology of high-power lasers and fiber amplifiers, pump coupling technology aims to couple hundreds of watts or even kilowatts of laser diode LD pump light pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02B6/42G02B6/036G02B6/245G02B6/24G02B6/34
Inventor 娄淑琴张帆王春灿耿蕊陆玉春
Owner BEIJING JIAOTONG UNIV
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