Double clad all-solid-state photonic crystal fiber and preparation method thereof

A photonic crystal fiber, all-solid-state technology, applied in the direction of cladding fiber, multi-layer core/cladding fiber, optical waveguide light guide, etc., can solve the problems of poor fiber system compatibility, difficult control of fiber loss, and high production cost , to achieve the effect of improving heat dissipation performance, increasing laser output power and increasing absorption coefficient

Active Publication Date: 2012-06-20
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the loss of the optical fiber is difficult to control, and the production cost is relatively high.
The second solution can also effectively improve the pump light absorption coefficient, but because the fiber core deviates from the geometric center of the fiber, fusion splicing is difficult, and the compatibility with the fiber system becomes poor

Method used

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  • Double clad all-solid-state photonic crystal fiber and preparation method thereof
  • Double clad all-solid-state photonic crystal fiber and preparation method thereof
  • Double clad all-solid-state photonic crystal fiber and preparation method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned double-clad all-solid-state photonic crystal fiber comprises the following steps:

[0026] ① Preparation of glass rods with uniform outer diameter:

[0027] In the ultra-clean room, the first glass rod 1, the second glass rod 2 and the third glass rod 3 are made by pipe rod method and wire drawing method. The second glass rod 2 is a uniform thin rod of non-doped glass. The three glass rods 3 are uniform thin rods doped with glass, and the first glass rod 1 is a uniform thin rod of cladding glass with a core, the core glass has a lower refractive index, and the outer cladding glass has a lower refractive index. High, then cut the uniform first glass rod 1, the second glass rod 2 and the third glass rod 3 into the same length L according to the requirements of preparing double-clad all-solid-state photonic crystal fiber;

[0028] ②Preparation of optical fiber preform:

[0029] Arrange m layers of the first glass rods 1 in a ...

Embodiment 1

[0034] Using phosphate glass as the matrix glass, the refractive index of the first glass rod 1 (cladding), the second glass rod 2, and the third glass rod 3 are (d line) 1.500, 1.536, 1.537 respectively, the first glass rod 1, The second glass rod 2 is not doped with rare earth, and the third glass rod 3 is Nd doped with a concentration of 3.5×10 20 cm -3 , the outer diameter of the three kinds of glass rods is 1 mm (the error is less than 1%), and the length is 8.5 cm. The softening point of No. 3 glass rods 1, 2, and 3 is between 450°C and 460°C; the inner hexagonal metal sleeve is stacked to form a preform, sintered at 540°C for 15 minutes, and annealed at 430°C for 10 hours to obtain a relatively complete cross section It is a hexagonal prefabricated rod with an outer diameter of 17.5mm. The ratio of the core diameter to the outer diameter of the first glass rod 1 is 6:23, which determines the ratio of the photonic crystal cladding d to Λ. Draw the wire at 600°C (40°C ...

Embodiment 2

[0037]Quartz glass is used as the matrix material, and the first glass rod 1, the second glass rod 2, and the third glass rod 3 with cladding are respectively ordinary quartz glass, fluorine-doped quartz glass, and rare earth-doped glass, with an outer diameter of 0.6 mm ( The error is less than 2%), and the length is 20cm. The third glass rod 3 is doped with Yb at a concentration of 2000ppm. 25 layers of first glass rods 1 are densely packed in the metal sleeve. Replace the outermost five layers of first glass rods 1 with second glass rods 2, replace the central first glass rod 1 with third glass rod 3, and sinter at 1800° C. for 20 minutes. Draw the filament at 2100°C to obtain a double-clad all-solid-state optical fiber.

[0038] use image 3 The device detects the absorption coefficient and laser performance of the optical fiber. The absorption coefficient at 976nm reaches 15dB / m, which is more than double that of ordinary double-clad optical fiber (6.5dB / m) obtained fr...

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Abstract

The invention relates to a double clad all-solid-state photonic crystal fiber and a preparation method thereof. The double clad all-solid-state photonic crystal fiber comprises a fiber core, an inner cladding and an outer cladding. The optical fiber is provided with the outer cladding of which the outer surface is of a round shape. The inner cladding is of a hexagon shape with a sawtooth structure. The preparation method of the double clad all-solid-state photonic crystal fiber comprises the following steps of: using a metal sleeve with an internal hexagon structure as a die; preparing a photonic crystal fiber per-form rod by a stacking method; replacing cladding air holes with glass with low refractive index, so that the making process and the fusion welding of the optical fiber are more simple and convenient; and forming the optical fiber, of which the outer surface is round and the inner cladding is of the hexagon shape with the sawtooth structure by utilizing the surface tension of the glass in the wire drawing process. A pumping light adsorption coefficient of the optical fiber is improved. The coupling efficiency and the pumping light adsorption coefficient are effectively improved. Compared with a double-layer optical fiber with a conventional structure, the output laser power and efficiency are improved by over twice.

Description

technical field [0001] The invention relates to a photonic crystal fiber, in particular to a double-clad all-solid photonic crystal fiber and a preparation method thereof. Background technique [0002] Photonic crystal fiber introduces regularly arranged low-refractive index regions into the cladding, which reduces the effective refractive index of the cladding to form a waveguide, and has better mode and dispersion characteristics. It is used in high-power fiber lasers, ultrafast fiber lasers, etc. important applications in the field. The unique structure of photonic crystal fiber also brings many difficulties to practical application. For example, the porous cladding structure makes the manufacturing process more difficult, especially when the matrix glass is multi-component glass, due to the poor performance of the glass material (softening point Nearby, the viscosity curve changes greatly with temperature), in order to keep the air holes in the cladding from distortion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036G02B6/02C03B37/027
CPCC03B2203/23C03B37/0122C03B2203/42C03B2203/10
Inventor 张光陈丹平于春雷周秦岭陈庆希
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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