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Large-mode-field photonic crystal fiber amplifier and preparation method thereof

A photonic crystal fiber, large mode field technology, applied in lasers, phonon exciters, laser parts and other directions, can solve the problem of no photonic crystal fiber amplifier structure preparation process, etc., to improve the flexibility of use, expand the scope of use, The effect of improving the quality of welding

Pending Publication Date: 2022-01-07
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no photonic crystal fiber amplifier structure and corresponding preparation process similar to cladding fiber

Method used

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  • Large-mode-field photonic crystal fiber amplifier and preparation method thereof
  • Large-mode-field photonic crystal fiber amplifier and preparation method thereof
  • Large-mode-field photonic crystal fiber amplifier and preparation method thereof

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preparation example Construction

[0042] The preparation method of the above-mentioned large mode field photonic crystal fiber amplifier comprises the following steps:

[0043] 1) According to the mode field size of the cladding beam combiner, the pure silica photonic crystal fiber is tapered to obtain the cladding combining fiber, and the mode field size of the cladding combining fiber after tapering is the same as The mode field size of the cladding beam combiner is matched, and the "adiabatic" transmission condition of the optical fiber fundamental mode is satisfied when tapered;

[0044] 2) Use commercial VytranLDC401 to process the end faces of all optical fibers to ensure that the cut end faces are clean and free of cracks and debris. The cladding fiber is reduced by 30%-50%;

[0045] 3) Clean the end faces of all optical fibers after cutting with ultrasonic alcohol mixture, and 2 Short-term, low-power heating on the fusion splicer;

[0046] 4) The fusion splicing of the mode-matched photonic crystal ...

Embodiment

[0052] The specific preparation process of the large mode field photonic crystal fiber amplifier of the present invention is as follows:

[0053] 1) On the Vytran3000 fusion splicer, select the tapering program with an outer diameter of 450 microns, and use a mode-matched photonic crystal fiber with an outer diameter of 450 microns for power correction, and reduce the heating power by half on the basis of the corrected power for tapering: put the outer The diameter is 450 microns, the cladding is 200 microns pure silica photonic crystal fiber is drawn to the outer diameter of 280 microns, the cladding is 125 microns, the length of the cone is 7mm, and the waist is 10mm;

[0054] 2) Use the VytranLDC400 cleaver to select a cutting program of 250 microns to cut the photonic crystal fiber, or use the CT105 cleaver to cut the bundled cladding fiber and reduce the cutting tension by 25%. The thimble of the cleaver rotates until it just touches the The state of the optical fiber is ...

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Abstract

The invention discloses a large-mode-field photonic crystal fiber amplifier and a preparation method thereof. The amplifier comprises a beam combining cladding optical fiber, a mode matching solid photonic crystal optical fiber, a rare earth doped quartz gain photonic crystal optical fiber and an output optical fiber which are connected in sequence. The large-mode-field photonic crystal fiber amplifier can be conveniently used in an all-fiber pulse amplification laser, high-beam-quality and high-energy output is realized, the output fiber has a flexible bending mode, an output end face does not need to be additionally processed, and the practicability of the fiber pulse laser is improved.

Description

technical field [0001] The invention relates to a large-mode-field photonic crystal fiber amplifier system, in particular to a large-mode-field photonic crystal fiber amplifier and a preparation method thereof. Background technique [0002] Rare earth doped silica fiber has been successfully used in industrial processing, medical treatment, energy, military and other fields due to its advantages of high output laser power and good thermomechanical properties. For rare earth-doped silica-clad fibers (core size is generally less than 20 microns), the main factors that limit the further improvement of its laser performance are the nonlinear effect and laser damage caused by the increase of power density at the fiber end face. In order to solve this problem, a large mode field fiber has been developed, which has become a research hotspot in recent years. [0003] Since 2004, the University of Southampton (Optics Express, 2004, Vol.12, No.25, pp.6088-6092), the Institute of Phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/094
CPCH01S3/06754H01S3/06716H01S3/06725H01S3/094076H01S3/06741
Inventor 冯素雅王孟张磊王世凯楼风光于春雷胡丽丽
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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