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Device and method for preparing long-periodic fiber bragg grating by femtosecond laser Talbot effect

A technology of femtosecond laser and fiber grating, which is applied in the direction of cladding optical fiber, optical waveguide, light guide, etc., can solve the problem of low utilization efficiency of femtosecond laser, achieve the effect of reducing production cost, reducing processing time and improving use efficiency

Inactive Publication Date: 2015-06-10
SHANDONG JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a disadvantage. When the femtosecond laser irradiates the amplitude mask, part of the femtosecond laser energy is blocked by the mask, and the utilization efficiency of the femtosecond laser is not high.

Method used

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  • Device and method for preparing long-periodic fiber bragg grating by femtosecond laser Talbot effect
  • Device and method for preparing long-periodic fiber bragg grating by femtosecond laser Talbot effect
  • Device and method for preparing long-periodic fiber bragg grating by femtosecond laser Talbot effect

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Embodiment 1

[0037] Embodiment 1 of the present invention such as figure 1 As shown, a device for fabricating long-period fiber gratings using the femtosecond laser Taber effect, the device includes a femtosecond laser light source 1, a first collimating diaphragm 2, a second collimating diaphragm 3, and an achromatic 1 / 2 A wave plate 4, a polarizing beamsplitter prism 5, a shutter 6, a mirror 7, a first convex lens 8, a second convex lens 9, a cylindrical lens 10, a first precision moving platform 11, a phase grating 12, a second precision moving platform 13, Optical fiber 14 to be processed, electronically controlled three-dimensional precision mobile platform 15, broadband light source 16, spectrometer 17, computer 18; it is characterized in that the femtosecond laser light source 1 is located before the first collimation diaphragm 2, and the sequence after the first collimation diaphragm 2 Place the second collimating diaphragm 3, the achromatic half-wave plate 4, the polarizing beam s...

Embodiment 2

[0047] A method for preparing a long-period fiber grating by using the above-mentioned device, the steps are as follows:

[0048] (1) each optical device in the above-mentioned device is built up the optical path according to the optical path sequence;

[0049] (2) Turn on the femtosecond laser source, adjust the pump light power of the femtosecond laser source amplification stage and the fast axis orientation of the achromatic half-wave plate, measure the femtosecond laser power with an optical power meter, and make the output from the polarization beam splitter prism The femtosecond laser power is 1.0 mW;

[0050] (3) Open the shutter, use the first collimation diaphragm and the second collimation diaphragm to adjust the position of each optical device in the optical path, so that the femtosecond laser passes through the achromatic 1 / 2 wave plate, polarization beam splitter prism, shutter, mirror , the first convex lens, the second convex lens, the cylindrical lens and the ...

Embodiment 3

[0058] Identical with embodiment 2 steps, just use cycle is 200 μ m in step (4), aperture ratio is 1 / 3, the one-dimensional pure phase grating that phase modulation is 2π / 3; The femtosecond laser power emitted by the polarization beam splitter prism is 1.4 watts; after the shutter is opened in step (8), the irradiation time of the femtosecond laser grating to be processed is 25 seconds to obtain a long-period fiber grating, image 3 The prepared long-period fiber grating transmission spectrum distribution curve, the highest resonance peak peak depth is -13.9dB.

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Abstract

The invention discloses a device for preparing a long-periodic fiber bragg grating by femtosecond laser Talbot effect and a method for preparing the long-periodic fiber bragg grating by femtosecond laser Talbot effect, and belongs to the technical field of manufacturing of a fiber sensor. The device comprises a femtosecond laser light source, first and second collimating diaphragms, an achromatic half-wave plate, a polarization splitting prism, a shutter, a reflecting mirror, first and second convex lenses, a cylindrical lens, first and second precise moving platforms, a phase grating, a to-be-processed fiber, an electric controlled three-dimensional precise moving platform, a broadband light source, a spectrograph and a computer. Based on the Talbot effect, the femtosecond laser is used for irradiating the phase grating and forming stable bright and dark alternated light intensity distribution at a preset score Talbot distance place behind the grating; the femtosecond laser is linearly focused and irradiated on the to-be-processed fiber through the cylindrical lens, and the to-be-processed fiber and the femtosecond laser are mutually acted to generate non-linear absorption; the refractive index is periodically changed, and thereby the long-periodic fiber bragg grating is prepared. The device and method have the advantages of being simple in structure, high in utilization rate of the femtosecond laser, short in processing time, and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the production field of optical fiber gratings, in particular to a device and method for preparing long-period optical fiber gratings by utilizing femtosecond laser Taber effect. Background technique [0002] Due to the advantages of easy miniaturization and integration, easy realization of multi-parameter sensing and measurement, corrosion resistance, anti-electromagnetic interference, and distributed measurement, fiber gratings have become one of the most promising and widely used fiber optic passive devices. . Long-period fiber gratings are a new type of fiber gratings that have only emerged in the past ten years, and are now playing an increasingly important role in fiber optic communications and fiber optic sensing. The traditional long-period fiber grating prepared by ultraviolet laser has poor temperature stability, especially under high temperature conditions, which may cause the complete disappearance of the grating c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02F1/35
CPCG02B6/02123G02F1/3523G02F1/365
Inventor 王伟
Owner SHANDONG JIAOTONG UNIV
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