CN109270625B - A kind of cucurbit optical fiber transmitting hollow beam - Google Patents
A kind of cucurbit optical fiber transmitting hollow beam Download PDFInfo
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- CN109270625B CN109270625B CN201811249816.2A CN201811249816A CN109270625B CN 109270625 B CN109270625 B CN 109270625B CN 201811249816 A CN201811249816 A CN 201811249816A CN 109270625 B CN109270625 B CN 109270625B
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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
- G02B6/02295—Microstructured optical fibre
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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
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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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
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Abstract
The invention discloses a kind of " cucurbit " optical fiber for transmitting hollow beam, belong to optical fiber structure design field.Specifically include air-core, fibre core antiresonance monocycle, quartz supports frame, covering air layer and silica clad, antiresonance wall is constituted by fibre core antiresonance monocycle, air is filled in fibre core forms air-core, and fibre core antiresonance monocycle is supported using quartz supports frame, it by the wall thickness for adjusting fibre core antiresonance monocycle, the position for adjusting quartz supports frame and fibre core antiresonance monocycle binding site, adjusts binding site size and adjusts the wall thickness of quartz supports frame, realize the hollow antiresonance optical fiber for blue detuning guiding atom.It is smaller that limitation loss is transmitted using " cucurbit " optical fiber provided by the present invention, structure is simple, can preferably transmit hollow beam, to improve the interaction area of light and atom and the guiding efficiency of atom, it is advantageously implemented blue detuning guiding atom experiment, realizes high-precision intervening atom gyro.
Description
Technical field
The invention belongs to optical fiber structure design fields, and in particular to a kind of " cucurbit " optical fiber for transmitting hollow beam.
Background technique
Hollow antiresonance optical fiber is a kind of novel Microstructure optical fiber that leaded light is realized by way of tunnelling ray, when in fibre core
Plunder into light transverse propagation constant and silica clad resonance does not occur when, a broadband leaded light window, one can be regarded it as
As have biggish structure size and simple cladding structure.Guide-lighting access is set up in air-core, can ideally be solved
The intrinsic defect (non-linear, dispersion, photic damage etc.) of certainly traditional solid core optical fiber.Uniqueness in this structure and guide-lighting mechanism
Make hollow antiresonance optical fiber that there are numerous characteristics different from traditional fiber, such as broadband leaded light and high damage threshold.
Using las er-guidance atom, when laser and atom and molecule effect, if laser frequency is bigger than atomic resonance frequency
(i.e. blue detuning), dipolar forces (also referred to as gradient force) caused by light field are directed toward feeble field direction.Therefore, if in hollow antiresonance light
Blue detuning hollow beam can be formed in fibre, and can be transmitted well, can thus be fettered atom in a fiber well
The heart, with the transmission of light, so that it may atom guiding is carried out, it is significant for intervening atom gyro.
The core size of the hollow core photonic bandgap fiber developed at present is limited by its guide-lighting principle, core size compared with
It is small, and fibre core wall surface is more coarse, and part light can occur scattering on surface and be depleted.However hollow antiresonance optical fiber
Larger core size can be designed, and has higher damage threshold, is more conducive to atom guiding.But develop at present
Hollow antiresonance optical fiber is mainly used for fiber optic communication, superlaser transmission etc., i.e., prevailing transmission mode is basic mode in optical fiber, and blue
High-order mode, i.e. hollow beam used in detuning guiding atom, it is general to be suppressed, it cannot be transmitted in hollow antiresonance optical fiber.
Summary of the invention
In order to solve the problems, such as not carrying out blue detuning guiding atom in hollow antiresonance optical fiber, the invention proposes one
" cucurbit " optical fiber of kind transmission hollow beam, particularly for the hollow antiresonance optical fiber of blue detuning guiding the atom, " calabash
Antiresonance wall is made of in reed " optical fiber fibre core antiresonance monocycle, filling air forms air-core in fibre core, and using quartz branch
Support supports fibre core antiresonance monocycle, by adjusting the wall thickness of fibre core antiresonance monocycle, adjusting quartz supports frame, adjusting
The position of binding site size and fibre core antiresonance monocycle binding site and the wall thickness for adjusting quartz supports frame are realized and are led for indigo plant to be detuning
Draw the hollow antiresonance optical fiber of atom.
A kind of " cucurbit " optical fiber transmitting hollow beam provided by the present invention, including air-core, fibre core antiresonance list
Ring, quartz supports frame, covering air layer and silica clad, the section of " cucurbit " optical fiber are circle；Air is filled in fibre core
Air-core is formed, air-core is located at the middle position of " cucurbit " optical fiber, constitutes antiresonance wall by fibre core antiresonance monocycle, and
Using quartz supports frame, fibre core antiresonance monocycle is supported, it is a length of that the wall thickness of the fibre core antiresonance monocycle meets light wave
The requirement that 780nm guiding laser does not leak.There are two the quartz supports framves, is respectively positioned in covering air layer, each quartz branch
The both ends of support are separately fixed on fibre core antiresonance monocycle and silica clad, and the diameter of the air-core is 40 μm, described
0.65 times with a thickness of air-core radius of covering air layer.
Advantages of the present invention with have the active effect that
" cucurbit " optical fiber transmission limitation loss provided by the present invention is smaller, does not need to add more in addition to silica
Remaining material, structure is simple, so as to substantially mitigate the weight of fiber optic loop, while the knot of quartz supports frame and fibre core antiresonance monocycle
Chalaza is few, reduces influence of the binding site to fibre loss, reduces drawing and requires, the air-core of provided " cucurbit " optical fiber
It is larger, hollow beam can be preferably transmitted, to improve the interaction area of light and atom, improves the guiding effect of atom
Rate is advantageously implemented blue detuning guiding atom experiment, is advantageously implemented high-precision intervening atom gyro.
Detailed description of the invention
Fig. 1 is a kind of transmission hollow beam " cucurbit " fiber cross-sections figure provided by the present invention；
Fig. 2 is a kind of transmission hollow beam " cucurbit " optical fiber limitation loss provided by the present invention with fibre core antiresonance list
The change curve schematic diagram of the wall thickness t of ring；
Fig. 3 is a kind of transmission hollow beam " cucurbit " optical fiber limitation loss provided by the present invention with quartz supports frame
Wall thickness t0Change curve schematic diagram；
Fig. 4 be a kind of transmission hollow beam " cucurbit " optical fiber limitation loss provided by the present invention with quartz supports frame with
The change curve schematic diagram of the position of fibre core antiresonance monocycle binding site；
Fig. 5 is a kind of transmission hollow beam " cucurbit " optical fiber limitation loss provided by the present invention with binding site fillet half
The change curve schematic diagram of diameter；
Fig. 6 is a kind of mode distributions of transmission hollow beam " cucurbit " optical fiber provided by the present invention under optimized parameter
Schematic diagram；
In figure:
1- air-core；2- fibre core antiresonance monocycle；3- quartz supports frame；
4- covering air layer；5- silica clad.
Specific embodiment
With reference to the accompanying drawing to it is provided by the present invention it is a kind of transmit hollow beam " cucurbit " optical fiber make further
It is bright.
Due to there is document (bibliography [1] Bashkansky M, Park D, Fatemi F K.Azimuthally and
radially polarized light with a nematic SLM[J].Optics Express,2009,18(1):212-
217.) show that vortex electric field polarization direction advantageously forms hollow beam, therefore, in order to ensure that electric field polarization direction is vortex
The detuning hollow beam of indigo plant can be transmitted in hollow antiresonance optical fiber, to be applied to blue detuning las er-guidance atom experiment,
Hollow antiresonance optical fiber i.e. under the premise of not increasing optical fiber fabrication difficulty for blue detuning guiding atom.
Primarily directed to guiding in the embodiment of the present invention87The experiment expansion research of Rb atom, due to87Rb atom is in air
Resonance optical wavelength 780.023nm, resonance optical wavelength in a vacuum is 780.24nm, as long as so optical wavelength of guiding laser
It is less than87The aerial resonance optical wavelength of Rb atom, as blue detuning guiding.But due to guiding laser optical wavelength with87The difference of Rb atomic resonance optical wavelength and power needed for guiding inversely, the premise of the power needed for not increasing excessive guiding
Under, probe into the guiding laser of a length of 780nm of light wave, i.e., blue detuning laser, guiding87The transmission of hollow beam produced by Rb atom is asked
Topic.
The present invention proposes a kind of " cucurbit " optical fiber for transmitting hollow beam, particularly for the hollow of blue detuning guiding atom
Antiresonance optical fiber is made of antiresonance wall in " cucurbit " optical fiber fibre core antiresonance monocycle 2, and filling air forms sky in fibre core
Gas fibre core, and quartz supports frame 3 is used, fibre core antiresonance monocycle 2 is supported.The quartz supports frame 3 meets transmission
The demand of the hollow beam in vortex electric field polarization direction simultaneously keeps optical fiber limitation loss minimum.By adjusting fibre core antiresonance monocycle
2 wall thickness, quartz supports frame 3 and 2 binding site of fibre core antiresonance monocycle position, adjust binding site size and quartz supports
The wall thickness of frame 3, the effect for inhibiting light to leak from antiresonance realize the antiresonance optical fiber for blue detuning guiding atom.
A kind of " cucurbit " optical fiber being used for transmission hollow beam provided by the present invention, as shown in Figure 1, " cucurbit " optical fiber
Section be circle, be followed successively by air-core 1, fibre core antiresonance monocycle 2, quartz supports frame 3, covering air layer 4 from inside to outside
With silica clad 5.The air-core 1 is located at the middle position of " cucurbit " optical fiber, and diameter 2r is 40 μm.The fibre core antiresonance
The wall thickness of monocycle 2 meets following require: a length of 780nm guiding laser leakage of limitation light wave.There are two the quartz supports framves 3,
It is respectively positioned in covering air layer 4, the both ends of each quartz supports frame 3 are separately fixed at fibre core antiresonance monocycle 2 and silica clad 5
On.0.65 times with a thickness of 1 radius r of air-core of covering air layer 4, the reflection that can use silica clad 5 is more preferable by light
Ground is limited in air-core 1, to reduce limitation loss.
The quartz supports frame 3 obtains in the following way: the annulus of radius R is chosen, with a thickness of t0, so that the circle
Ring intersects with fibre core antiresonance monocycle 2 and silica clad 5, then being located at two sections of circular arcs in covering air layer 4 is quartz branch
Support 3.
The radius R of the annulus is 25 μm.
One end of the quartz supports frame 3 and 2 welding of fibre core antiresonance monocycle, the other end and 5 welding of silica clad, in this way
There are two binding site on quartz supports frame 3 and fibre core antiresonance monocycle 2 has altogether, be conducive to reduce fiber transmission attenuation.
At link position between the quartz supports frame 3 and fibre core antiresonance monocycle 2, at one of quartz supports frame 3
Endpoint first processes the notch that can place fibre core antiresonance monocycle 2, and fibre core antiresonance monocycle 2 is placed on to the notch
Welding is carried out again；The other end of quartz supports frame 3 is connected with silica clad 5 again later.
For " cucurbit " optical fiber provided by the present invention for being used for transmission hollow beam, concrete structure design optimization is as follows:
The wall thickness t of fibre core antiresonance monocycle 2 is the key that inhibit light leakage and generate hollow mode, and the present invention probes into first
For the guiding laser of a length of 780nm of light wave, influence of the wall thickness t of fibre core antiresonance monocycle 2 to optical fiber limitation loss characteristic.Such as
Shown in Fig. 2, sinusoid variation is totally presented with the wall thickness t of fibre core antiresonance monocycle 2 in limitation loss, mainly due to antiresonance
Light principle is transmitted, when the light wavelength lambda of the wall thickness t of fibre core antiresonance monocycle 2 and guiding laser meet the relationship such as formula (1), is led
Draw laser to resonate with fibre core antiresonance monocycle 2, leaks into 1 outside of air-core, limitation loss is caused to increase；Therefore, if
The wall thickness t being calculated in formula (1) is avoided when counting the wall thickness t of fibre core antiresonance monocycle 2.
In formula, m is any positive integer, and λ is the optical wavelength for guiding laser, and t is the wall thickness t, n of fibre core antiresonance monocycle 21It is
The Refractive Index of Material of fibre core antiresonance monocycle 2, n0It is the medium refraction index that light is used for transmission in air-core 1.
In order to more easily observe fluctuation situation of the numerical value compared with small data, logarithm is taken to the limitation loss that emulation generates.
By Fig. 2 it is found that when the wall thickness t of fibre core antiresonance monocycle 2 is 1.6 μm, optical fiber limitation loss is minimum, but since fibre core is anti-
The numerical value of the wall thickness t of resonance monocycle 2 is bigger, and the transmission mode in hollow antiresonance optical fiber is more unstable, i.e., high-order mode cannot be steady
Fixed transmission.Therefore, by Fig. 2, when the wall thickness t of fibre core antiresonance monocycle 2 is less than 1.6 μm, the present invention specifically has studied fibre core
Optical fiber property of the wall thickness t of antiresonance monocycle 2 near 0.5 μm, studies have shown that the wall thickness t when fibre core antiresonance monocycle 2 is
At 0.44 μm, hollow antiresonance optical fiber provided by the present invention can transmit hollow beam in the case where guiding laser well, therefore
The wall thickness that the present invention selectes the fibre core antiresonance monocycle 2 is 0.44 μm.
Quartz supports frame 3 is the key factor for determining optical fiber limitation loss size, and being primarily due to quartz supports frame 3 can increase
Add inside of optical fibre reflecting surface, it is therefore desirable to the wall thickness t of quartz supports frame 30, quartz supports frame 3 and 2 knot of fibre core antiresonance monocycle
The position of chalaza and binding site size optimize.
Fig. 3 is under the premise of guaranteeing that the wall thickness of fibre core antiresonance monocycle 2 is 0.44 μm, by changing quartz supports frame 3
Wall thickness, the limitation loss characteristic being calculated.In order to more easily observe fluctuation situation of the numerical value compared with small data, emulation is produced
Raw limitation loss takes logarithm.From the figure 3, it may be seen that broken line does not have breakpoint, i.e. the wall thickness t of quartz supports frame 30To hollow antiresonance light
Transmission mode in fibre influences very little, by general trend it can be concluded that, the wall thickness t of quartz supports frame 30At 0.2 μm or so, optical fiber
Limitation loss it is smaller, therefore the present invention selectes the wall thickness t of the quartz supports frame 30It is 0.2 μm.
Fig. 4 is the 3 wall thickness t of quartz supports frame at t=0.44 μm of 2 wall thickness of fibre core antiresonance monocycle0At=0.2 μm, stone is probed into
Influence of the position of English support frame 3 and 2 binding site of fibre core antiresonance monocycle to fibre loss characteristic.As shown in Figure 1, fibre core is anti-humorous
Vibration monocycle 2 and 3 distance of center circle of quartz supports frame are R+p, and R is the internal diameter of 3 position annulus of quartz supports frame, and p is quartz supports
The circle center distance that fibre core antiresonance monocycle 2 is arrived at the highest point of 3 place annulus of frame, due to the center of circle position of fibre core antiresonance monocycle 2
At (0.0), and require to guarantee that quartz supports frame 3 in the lower section of fibre core antiresonance monocycle 2, plays and holds up fibre core antiresonance list
The effect of ring 2, therefore p just determines the position of quartz supports frame 3, that is, determines that fibre core antiresonance monocycle 2 and quartz are propped up
The position of 3 binding site of support.As shown in Figure 4, broken line does not have breakpoint, i.e. quartz supports frame 3 is combined with fibre core antiresonance monocycle 2
The position of point does not influence the transmission mode in hollow antiresonance optical fiber, but is affected to limitation loss.It can by Fig. 4
Know, the range at the highest point of 3 place annulus of quartz supports frame to the circle center distance p of fibre core antiresonance monocycle 2 is -12~0
μm when, limitation loss it is smaller.Negative sign therein indicates that the position of quartz supports frame 3 is located at fibre core antiresonance monocycle 2 shown in FIG. 1
The center of circle below.
On the basis of the studies above, Fig. 5 is quartz supports frame 3 and fibre core antiresonance monocycle 2 when probing into fibre-optical drawing
Influence of the binding site size to optical fiber limitation loss characteristic.Binding site size indicates by binding site radius of corner, as shown in Figure 5,
Quartz supports frame 3 has an impact to limitation loss with 2 binding site radius of corner of fibre core antiresonance monocycle, when binding site radius of corner
0.6μm ≤r0≤ 1 μm, limitation loss is smaller, wherein r0Limitation loss is minimum at=1 μm.Due to above-mentioned discussion quartz supports frame 3
Wall thickness be only 0.2 μm or so, binding site radius of corner does not exceed 1 μm in pulling process, this will reduce to drawing technology
Middle pressure control requirement.According to Fig. 5 simulation result, quartz supports frame 3 and 2 binding site radius of corner of fibre core antiresonance monocycle are determined
r0=1 μm is optimal result.
Fig. 6 is hollow antiresonance optical fiber according to the mode distributions schematic diagram under above-mentioned optimal parameter design.According to above-mentioned point
Analysis, t=0.44 μm of wall thickness of selection fibre core antiresonance monocycle 2,20 μm of air-core radius, the wall thickness t of quartz supports frame 30=
0.2 μm, p=-8 μm of circle center distance that fibre core antiresonance monocycle 2 is arrived at the highest point of 3 place annulus of quartz supports frame is therein
Negative value indicates that the position of quartz supports frame is located at below the center of circle of fibre core antiresonance monocycle, and binding site radius of corner is r0=1 μm,
Simulation analysis is carried out as final argument, emulation obtains the mode distributions under optimal parameter design as shown in fig. 6, hollow antiresonance
Fiber optic hub can form good hollow beam, and polarization direction has TE01Mould vortex field distribution, such electric field
Polarization direction, which is more advantageous to, generates stable hollow beam.
Modeling analysis is carried out by " cucurbit " optical fiber to transmission hollow beam provided by the present invention, by hollow antiresonance
The big fibre core of optical fiber is combined with current atom guiding problem, is had the present invention and is increased blue detuning Interaction between atom and field
Area, can ignore laser high power to the damage of micro-structure light, improve the advantages that atom guiding efficiency.
The present invention uses simplest antiresonance structure, i.e. positive camber cavity ring, not only contributes to be formed hollow beam also
It can reduce fibre-optical drawing difficulty.According to simulation analysis, the present invention can transmit the hollow beam being evenly distributed, and also turn out simultaneously
Antiresonance hollow-core fiber can preferably transmit high-order mode, and theoretical limitation loss can reduce 0.62dB/m, favorably
Efficiency is guided in improving atom；The gradient force of direction fibre core is generated to atom to manipulate atom, in turn by blue detuning light field again
Realize blue detuning guiding87Rb atom pushes high-precision intervening atom gyro to realize.
Claims (7)
1. a kind of " cucurbit " optical fiber for transmitting hollow beam, which is characterized in that including air-core, fibre core antiresonance monocycle, stone
English support frame, covering air layer and silica clad, the section of " cucurbit " optical fiber are circle, and filling air forms sky in fibre core
Gas fibre core, air-core are located at the middle position of " cucurbit " optical fiber, antiresonance wall are made of fibre core antiresonance monocycle, and use stone
English support frame supports fibre core antiresonance monocycle, and the wall thickness of the fibre core antiresonance monocycle, which meets a length of 780nm of light wave, leads
Drawing the requirement that laser does not leak, there are two the quartz supports framves, is respectively positioned in covering air layer, and the two of each quartz supports frame
End is separately fixed on fibre core antiresonance monocycle and silica clad, and the diameter of the air-core is 40 μm, the covering air
0.65 times with a thickness of air-core radius of layer；
The quartz supports frame obtains in the following way: the annulus of radius R is chosen, with a thickness of t0, so that the annulus and fibre
Core antiresonance monocycle and silica clad intersect, then two sections of circular arcs being located in covering air layer are quartz supports frame.
2. a kind of " cucurbit " optical fiber for transmitting hollow beam as described in claim 1, which is characterized in that the radius of the annulus
R is 25 μm.
3. a kind of " cucurbit " optical fiber for transmitting hollow beam as described in claim 1, which is characterized in that the fibre core antiresonance
The wall thickness of monocycle is 0.44 μm.
4. a kind of " cucurbit " optical fiber for transmitting hollow beam as described in claim 1, which is characterized in that the quartz supports frame
Wall thickness t0It is 0.2 μm.
5. a kind of " cucurbit " optical fiber for transmitting hollow beam as described in claim 1, which is characterized in where quartz supports frame
Range at the highest point of annulus to the circle center distance p of fibre core antiresonance monocycle is -12~0 μm, and negative sign therein indicates quartz
The position of support frame is located at below the center of circle of fibre core antiresonance monocycle.
6. a kind of " cucurbit " optical fiber for transmitting hollow beam as claimed in claim 5, which is characterized in where quartz supports frame
P=-8 μm of circle center distance that fibre core antiresonance monocycle is arrived at the highest point of annulus.
7. a kind of " cucurbit " optical fiber for transmitting hollow beam as described in claim 1, which is characterized in that quartz supports frame and fibre
Core antiresonance monocycle binding site radius of corner r0=1 μm.
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| CN112456789B (en) * | 2020-11-24 | 2023-07-25 | 江苏法尔胜光电科技有限公司 | Gourd-shaped polarization maintaining optical fiber and preparation method thereof |
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| CN101122651A (en) * | 2007-09-19 | 2008-02-13 | 中国科学院上海光学精密机械研究所 | Cladding gain guide microstructure hollow optical fiber |
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