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Homogenized optical fiber of multi-layer square structure

A homogenizing fiber, square technology, applied in the direction of multi-layer core/clad fiber, clad fiber, light guide, etc., can solve the problems of small effective mode area and large loss of flat-top beam, and achieve good coupling, The effect of large model area and large development prospects

Active Publication Date: 2021-06-25
NANJING UNIV OF POSTS & TELECOMM
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  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies of the prior art, the present invention provides a homogenized optical fiber with a multi-layer square structure, which can solve the problem that the existing flat-hat beam effective mode area is not large and the loss is large

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0030] The invention discloses a homogenized optical fiber with a multilayer square structure, which includes a cladding and an inner fiber core. The cladding includes an air layer, and the air layer includes three layers, which are respectively a first air layer and a second air layer from outside to inside. layer and the third air layer, a doped layer is arranged outside the fiber core, the first air layer, the second air layer, the third air layer and the doped layer appear as a square whose size decreases successively, and the four vertices of the square are Square, other parts are sorted by multiple air holes or doping holes. The central doped layer is doped with different concentrations of GeO 2 , the innermost layer is ordinary quartz crystal. The initial value of the doping molar concentration in the doped region is set to 4.5%, and ...

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Abstract

The invention discloses a homogenized optical fiber of a multilayer square structure. The homogenized optical fiber comprises a cladding and an internal fiber core, wherein the cladding comprises air holes, the air holes comprise three layers including a first air layer, a second air layer and a third air layer from outside to inside, a doping layer is arranged on the outer layer of the fiber core, the first air layer, the second air layer, the third air layer and the doping layer are in a square shape with the size decreasing in sequence, the four vertex angles of the square are square, and other parts are obtained by sorting a plurality of doping holes. The structure of combining the air holes and the doping holes can generate a uniform flat-topped light beam, the polarization error degree of the cross section of the central axis can reach 0.1%, the mode field area can reach 22334.55 microns < 2 >, and the lowest loss can reach 6.27 * 10 <-11 > db / m.

Description

technical field [0001] The invention relates to the technical field of optical fiber beam shaping, in particular to a homogenized optical fiber with a multilayer square structure. Background technique [0002] A top-hat beam is a laser beam with nearly uniform fluence (energy density) in a circular area. It is generally produced by a Gaussian beam passing through a diffractive optical element. Top-hat beams are commonly used in industry, such as laser drilling in printed circuit boards. For a given total power, the flat-top mode has lower peak power than the Gaussian mode, which can effectively improve the threshold of nonlinear effects and thermal damage threshold. [0003] Top-hat beams are also commonly used in high-power laser systems that utilize a series of optical amplifiers to generate an intense beam. Due to the advantages of compact structure, high frequency, reliability, good beam quality and high signal carrying capacity, high-power fiber lasers can be widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/032G02B6/036
CPCG02B6/02342G02B6/02371G02B6/032G02B6/03638G02B6/02
Inventor 张祖兴卢光伟刘双吕东育
Owner NANJING UNIV OF POSTS & TELECOMM
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