CN104678488A - Double-annular core photonic crystal fiber for generating bottle beam - Google Patents

Double-annular core photonic crystal fiber for generating bottle beam Download PDF

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Publication number
CN104678488A
CN104678488A CN201510050228.6A CN201510050228A CN104678488A CN 104678488 A CN104678488 A CN 104678488A CN 201510050228 A CN201510050228 A CN 201510050228A CN 104678488 A CN104678488 A CN 104678488A
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CN
China
Prior art keywords
photonic crystal
fiber
crystal fiber
bottle
beams
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CN201510050228.6A
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Chinese (zh)
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CN104678488B (en
Inventor
李曙光
訾剑臣
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Yibo Communication Equipment Group Co ltd
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Yanshan University
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02295—Microstructured optical fibre
    • G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
    • G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
    • G02B6/02323—Core having lower refractive index than cladding, e.g. photonic band gap guiding
    • G02B6/02328—Hollow or gas filled core

Abstract

The invention discloses a double-annular core photonic crystal fiber for generating a bottle beam. The photonic crystal fiber consists of a fiber cladding and two annular cores, wherein air holes in multilayer triangular array distribution are uniformly formed in the fiber cladding, and the background material of the fiber cladding is pure quartz; the double annular cores consist of two groups of units lack of 6 air holes and with core center air holes, and are symmetrically distributed on the two sides of the center air hole of the fiber. The photonic crystal fiber can be used for generating two bottle beams, the two bottle beams can be converged after passing through a triangular prism, and a three-dimensional light field with zero center intensity, i.e. the bottle beam, is formed on the converging part. According to the photonic crystal fiber, a high-quality bottle beam can be stably generated; the whole photonic crystal fiber is simple and easy to regulate; the size of the bottle beam can be controlled by changing own structural parameters (diameters d1 of the air holes of the cores and diameters d2 of the air holes of the cladding) of the fiber.

Description

A kind of double-ring core light photonic crystal fiber for generation of bottle beams
Technical field
The invention belongs to technical field of optical fiber, particularly a kind of photonic crystal fiber, especially may be used for the photonic crystal fiber producing bottle beams.
Background technology
Bottle beams refers to have Center Dark Spot and this Center Dark Spot special light field of one class of being surrounded completely by strong laser field at three dimensions, and this light field, just as special " closed container ", is therefore also called " bottle light beam " or " blobs " by visually.The method producing bottle beams mainly contains: 1) adopt radially-arranged π phase-plate; 2) based on the interference of Gaussian beam and Laguerre Gaussian beam; 3) end-face pump solid laser etc. of special pumping light beams and limiting aperture is adopted.Because bottle beams has special optical field distribution, make it have very high practical value, obtain practical application in fields such as cold atom seizure and optical micro-manipulations at present.
Photonic crystal fiber (PCF), be otherwise known as microstructured optical fibers or porous optical fiber, and its structural design is adjustable flexibly, this characteristic making it have many traditional fiber not possess, as high birefringence, ultra-low limitation loss, dispersion-tunable etc.The invention of this kind of optical fiber provides a kind of very effective and easy way for producing bottle beams.
Hollow beam is a kind of central light strength is in the propagation direction the annular beam of zero.There are some researches prove, photonic crystal fiber can be utilized to produce high-quality single hollow beam, particulate (as molecule, atom) is caught and handled, but catching of carrying out of this hollow beam and manipulation is confined to two dimension, well three-dimensional restriction can not be carried out to particulate.Bottle beams can carry out three-dimensional restriction to particulate well, but the device producing bottle beams is at present general comparatively complicated, is difficult to adjustment, is not easy to produce high-quality bottle beams.
Summary of the invention
The object of the invention is to provide a kind of Stability Analysis of Structures, be easy to the double-ring core light photonic crystal fiber for generation of bottle beams that adjusts, quality is higher.
The present invention mainly adopts double-core photonic crystal fiber and carries out appropriate design to its structural parameters.
The primary structure of photonic crystal fiber of the present invention is made up of two ring-type fibre cores and fibre cladding.Wherein, the airport of uniform multilayer triangular array distribution is provided with in fibre cladding, covering airport diameter d 2control within the scope of 2 ~ 2.7 μm, two pitch of holes Λ=5 μm, the background material of covering is pure quartz.6 airports are lacked and the unit with core centre pore forms double-ring fibre core, the hole diameter d of core centre by two groups 1control within the scope of 1 ~ 4 μm, two fibre cores are distributed in fiber optic hub airport both sides symmetrically.Utilize this photonic crystal fiber, can produce two hollow beams, make these two hollow beams by assembling after a prism, can produce a center intensity in convergence place is the 3 d light fields of zero, i.e. bottle beams.Two hollow beam sizes that size and this optical fiber of bottle beams produce are relevant.
The present invention compared with prior art tool has the following advantages:
1, this photonic crystals optical fiber structure is stablized, and can produce two hollow beam in high quality and then stably produce bottle beams.
2, utilize this photonic crystal fiber to produce the device overall simple of bottle beams, be easy to adjustment.
3, can by changing structural parameters (the fibre core hole diameter d of optical fiber itself 1with covering hole diameter d 2) control the Output Size of two hollow beam, and then control produce the size of bottle beams.
Accompanying drawing explanation
Fig. 1 is the photonic crystal fiber cross-sectional view of the embodiment of the present invention 1.
Fig. 2 is the mode distributions figure of photonic crystal fiber at 1.55 μm of places of the embodiment of the present invention 1.
Fig. 3 is the schematic diagram utilizing the photonic crystal fiber of the embodiment of the present invention 1 to produce bottle beams.
Fig. 4 is the energy flow chart of photonic crystal fiber at 1.55 μm of places of the embodiment of the present invention 1.
Fig. 5 is the energy flow chart of photonic crystal fiber at 1.55 μm of places of the embodiment of the present invention 1, embodiment 2 and embodiment 3.
Fig. 6 is that the limitation loss of the photonic crystal fiber of the embodiment of the present invention 1, embodiment 2 and embodiment 3 is with wavelength variations graph of a relation.
Fig. 7 is the energy flow chart of photonic crystal fiber at 1.55 μm of places of the embodiment of the present invention 1, embodiment 4 and embodiment 5.
Fig. 8 is that the limitation loss of the photonic crystal fiber of the embodiment of the present invention 1, embodiment 4 and embodiment 5 is with wavelength variations graph of a relation.
Embodiment
Embodiment 1
In the photonic crystal fiber cross-sectional view of the embodiment of the present invention 1 shown in Fig. 1, this optical fiber is mainly made up of two ring-type fibre cores 1 and covering 2.Wherein, the airport 3 of uniform multilayer triangular array distribution is provided with in fibre cladding, covering airport diameter d 2=2.5 μm, two pitch of holes Λ=5 μm, the background material of covering is pure quartz.6 airports are lacked and the unit with core centre pore forms double-ring fibre core, the hole diameter d of core centre by two groups 1=2.5 μm, two fibre cores are distributed in fiber optic hub airport both sides symmetrically.
The embodiment of the present invention 1 shown in Fig. 2 optical fiber 1.55 μm place mode distributions figure in, can find out, light field mainly concentrates on two fibre core places and distributes in the form of a ring, and namely this photonic crystal fiber can produce high-quality pair of hollow beam.
As shown in Figure 3, two that utilize the photonic crystal fiber 4 of the embodiment of the present invention 1 to produce high-quality hollow beams 5 can be assembled after a prism 6, and can produce a center intensity in convergence place is the 3 d light fields of zero, i.e. bottle beams.Obviously, the size of bottle beams has direct relation with the size of two hollow beam.Can by controlling the Output Size of two hollow beam, so control produce the size of bottle beams.
The embodiment of the present invention 1 shown in Fig. 4 photonic crystal fiber 1.55 μm place energy flow chart in, the parameter of some hollow beams is labeled out.Blackening dimension D SS refers to the halfwidth degree (Full-width half-maximum, FWHM) of radial intensity distribution inside light beam, width of light beam W dHBrefer to the 1/e of light beam outer radial intensity distributions maximal value 2protect the full duration at place, beam radius r odistance referring to from beam center to maximum radial intensity locations.
Embodiment 2
The embodiment of the present invention 2 is substantially the same manner as Example 1, and difference is at fibre core hole diameter d 1be reduced to 1 μm, its can flow point cloth and limitation loss with wavelength variations relation respectively as shown in homologous thread in Fig. 5 and Fig. 6.As can be seen from the figure, this optical fiber, compared with embodiment 1 optical fiber, obtains less blackening size and lower limitation loss.μm place in λ=1.55, its blackening diameter is 4.3 μm, and limitation loss is 1.86 × 10 -2dB/m.
Embodiment 3
The embodiment of the present invention 3 is substantially the same manner as Example 1, and difference is at fibre core hole diameter d 1increase to 4 μm, its can flow point cloth and limitation loss with wavelength variations relation respectively as shown in homologous thread in Fig. 5 and Fig. 6.As can be seen from the figure, this optical fiber, compared with embodiment 1 optical fiber, obtains larger blackening size and the limitation loss of Geng Gao.μm place in λ=1.55, its blackening diameter is 6.4 μm, and limitation loss is 7.16 × 10 -2dB/m.
Embodiment 4
The embodiment of the present invention 4 is substantially the same manner as Example 1, and difference is at covering hole diameter d 2be reduced to 2 μm, its can flow point cloth and limitation loss with wavelength variations relation respectively as shown in homologous thread in Fig. 7 and Fig. 8.As can be seen from the figure, this optical fiber, compared with embodiment 1 optical fiber, obtains larger blackening size and the limitation loss of Geng Gao.μm place in λ=1.55, its blackening diameter is 5.4 μm, and limitation loss is 1.01dB/m.
Embodiment 5
The embodiment of the present invention 5 is substantially the same manner as Example 1, and difference is at covering hole diameter d 2increase to 2.7 μm, its can flow point cloth and limitation loss with wavelength variations relation respectively as shown in homologous thread in Fig. 7 and Fig. 8.As can be seen from the figure, this optical fiber, compared with embodiment 1 optical fiber, obtains less blackening size and lower limitation loss.μm place in λ=1.55, its blackening diameter is 5 μm, and limitation loss is 5.45 × 10 -3dB/m.

Claims (2)

1. for generation of a double-ring core light photonic crystal fiber for bottle beams, it is made up of two ring-type fibre cores and fibre cladding, it is characterized in that: the airport being provided with the distribution of uniform multilayer triangular array in fibre cladding, covering airport diameter d 2control within the scope of 2 ~ 2.7 μm, two pitch of holes Λ=5 μm, its background material is pure quartz, lacks 6 airports and the unit with core centre pore forms double-ring fibre core, the hole diameter d of core centre by two groups 1control within the scope of 1 ~ 4 μm, two fibre cores are distributed in fiber optic hub airport both sides symmetrically.
2. the method for the generation bottle beams of the double-ring core light photonic crystal fiber for generation of bottle beams according to claim 1, it is characterized in that: utilize the photonic crystal fiber described in claim 1, produce two hollow beams, make these two hollow beams by assembling after a prism, can produce a center intensity in convergence place is the 3 d light fields of zero, i.e. bottle beams, the size of bottle beams can by changing structural parameters and the fibre core hole diameter d of optical fiber itself 1with covering hole diameter d 2control.
CN201510050228.6A 2015-01-30 2015-01-30 A kind of double-ring fibre core photonic crystal fiber for being used to produce bottle beams Active CN104678488B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109633916A (en) * 2019-01-16 2019-04-16 长春理工大学 A kind of array bottle beams system based on bar item
CN113917596A (en) * 2021-10-12 2022-01-11 燕山大学 Microstructure optical fiber for dispersion compensation

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN109633916A (en) * 2019-01-16 2019-04-16 长春理工大学 A kind of array bottle beams system based on bar item
CN109633916B (en) * 2019-01-16 2021-03-26 长春理工大学 Array local hollow beam system based on bar
CN113917596A (en) * 2021-10-12 2022-01-11 燕山大学 Microstructure optical fiber for dispersion compensation

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Effective date of registration: 20230110

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