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Ultra-large-mode-field low-numerical-aperture metal coating gain optical fiber and manufacturing method thereof

A numerical aperture and metal coating technology, which is applied in cladding optical fiber, multi-layer core/clad optical fiber, glass optical fiber, etc., can solve the problem of insufficient thermal tolerance temperature of optical fiber, unstable optical fiber mode, and low numerical aperture of the fiber core. To achieve the effect of ensuring single-mode operation with large core diameter, reducing the numerical aperture of the fiber core, and increasing the heat conduction effect

Active Publication Date: 2020-12-22
武汉光谷航天三江激光产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]For fiber with ultra-large mode field and low numerical aperture, the core diameter of the fiber is large, the maximum can be 100μm, the core numerical aperture is low, and the minimum can be as low as to 0.008, and the optical fiber adopts fluorine-doped silica cladding structure, the coating used in conventional optical fiber has a low refractive index, which leads to the low heat resistance temperature of the optical fiber. However, the mode instability threshold of the fiber is not high enough, which will cause the fiber to be burned or the mode to be unstable

Method used

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  • Ultra-large-mode-field low-numerical-aperture metal coating gain optical fiber and manufacturing method thereof
  • Ultra-large-mode-field low-numerical-aperture metal coating gain optical fiber and manufacturing method thereof

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Embodiment 1

[0039] figure 1 Shown is a cross-sectional view of an ultra-large mode field low numerical aperture single-mode metal-coated gain fiber. The diameter of the core 1 of the gain fiber is 40 μm, the diameter of the cladding 2 is 400 μm, and the thickness of the third cladding 3 is 20 μm. The temperature is 640°C, the temperature difference between the silver-aluminum alloy and the bare fiber is reduced to 10°C, the stress is released, and the silver-aluminum alloy is effectively coated on the bare fiber, the thickness of the coating layer is 65 μm, and the numerical aperture of the fiber core is 0.02 , the cladding absorption coefficient @915nm is 1dB / m. Using the gain fiber to build as figure 2 The high-power narrow-linewidth fiber laser shown, wherein the length of the gain fiber is 4m, and the gain fiber is not bent.

Embodiment 2

[0041] The diameter of the core 1 of the gain fiber is 30 μm, the diameter of the cladding 2 is 300 μm, and the thickness of the third cladding 3 is 60 μm. The temperature is 850°C, reduce the temperature difference between the silver-aluminum alloy and the bare fiber to 10°C, release the stress, and effectively coat the silver-aluminum alloy on the bare fiber, the thickness of the coating layer is 20μm, and the numerical aperture of the fiber core is 0.008 , the cladding absorption coefficient @915nm is 0.4dB / m. Using the gain fiber to build as figure 2 The high-power narrow-linewidth fiber laser shown, wherein the length of the gain fiber is 2m, and the gain fiber is not bent.

Embodiment 3

[0043] figure 1 Shown is a cross-sectional view of an ultra-large mode field low numerical aperture single-mode metal-coated gain fiber. The diameter of the core 1 of the gain fiber is 100 μm, the diameter of the cladding 2 is 1000 μm, and the thickness of the third cladding 3 is 100 μm. The temperature is 950°C, the temperature difference between the silver-aluminum alloy and the bare fiber is reduced to 10°C, the stress is released, and the silver-aluminum alloy is effectively coated on the bare fiber, the thickness of the coating layer is 200μm, and the numerical aperture of the fiber core is 0.03 , the cladding absorption coefficient @915nm is 2dB / m. Using the gain fiber to build as figure 2 In the high-power narrow-linewidth fiber laser shown, the length of the gain fiber is 9m, and the gain fiber is not bent.

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Abstract

The invention discloses an ultra-large-mode-field low-numerical-aperture metal coating gain optical fiber which sequentially comprises a fiber core, an inner cladding, a third cladding and a coating layer from inside to outside, the inner cladding is a quartz cladding, the third cladding is a fluorine-doped quartz cladding, and the coating layer is a metal coating layer. On the basis of the designframework of an existing fiber laser structure, a key device high-power gain fiber in the laser is improved, and the fiber core radius, the inner cladding radius, the fiber core numerical aperture, the inner cladding absorption coefficient, the fiber length and the non-bending coiling mode in use of the high-power gain fiber are optimized; and the optical fiber coating layer material and the coating mode are changed, and the stimulated Brillouin threshold value and the mode instability threshold value of the high-power narrow-linewidth optical fiber laser are improved.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and is used for improving the stimulated Brillouin threshold and mode instability threshold in a high-power narrow-linewidth fiber laser, and improving the beam quality of the laser, and in particular relates to a super-large mode field and low numerical aperture metal coating Cladding gain fiber and method of making the same. Background technique [0002] With the continuous development of fiber lasers to higher power, nonlinear effects and mode instability effects have become two more and more important factors that limit the improvement of laser output power. In order to reduce the nonlinear effect in the fiber, it is necessary to increase the core diameter of the fiber, but the larger the fiber core diameter will lead to the poorer effect of suppressing the mode instability of the fiber; conversely, reducing the fiber core can suppress the mode instability effect, but will increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036C03C25/106C03C25/12C03C25/46
CPCG02B6/02395G02B6/03622G02B6/02C03C25/1063C03C25/12C03C25/46
Inventor 杨雨雷敏王天晗胡阿健戴玉芬武春风李强姜永亮刘厚康宋祥
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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