CN110244401A - Single mode sapphire fiber grating and preparation method thereof - Google Patents
Single mode sapphire fiber grating and preparation method thereof Download PDFInfo
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- CN110244401A CN110244401A CN201810195303.1A CN201810195303A CN110244401A CN 110244401 A CN110244401 A CN 110244401A CN 201810195303 A CN201810195303 A CN 201810195303A CN 110244401 A CN110244401 A CN 110244401A
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- 229910052594 sapphire Inorganic materials 0.000 title claims abstract description 211
- 239000010980 sapphire Substances 0.000 title claims abstract description 211
- 239000000835 fiber Substances 0.000 title claims abstract description 183
- 238000002360 preparation method Methods 0.000 title claims abstract description 35
- 238000006073 displacement reaction Methods 0.000 claims abstract description 30
- 238000013519 translation Methods 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 7
- 239000010437 gem Substances 0.000 claims description 4
- 229910001751 gemstone Inorganic materials 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005305 interferometry Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005253 cladding Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 241001062009 Indigofera Species 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
-
- 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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02133—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
-
- 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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02133—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
- G02B6/02138—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference based on illuminating a phase mask
-
- 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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02147—Point by point fabrication, i.e. grating elements induced one step at a time along the fibre, e.g. by scanning a laser beam, arc discharge scanning
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The present invention relates to a kind of preparation methods of single mode sapphire fiber grating, comprising the following steps: clamps sapphire fiber and is fixed on displacement platform；Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；The femto-second laser is adjusted, so that laser successively forms the first focal beam spot and the second focal beam spot in the two sides at sapphire fiber center, institute's translation stage drives the sapphire fiber at the uniform velocity to move in the axial direction, and single mode sapphire fiber is made；Grating processed is write in the single mode sapphire fiber, obtains single mode sapphire fiber grating.Small insertion loss, narrow bandwidth and single mode sapphire fiber grating with high accuracy can be made in the preparation method of above-mentioned single mode sapphire fiber grating.
Description
Technical field
The present invention relates to fiber optic communication and field of sensing technologies, in particular to a kind of single mode sapphire fiber grating and its system
Preparation Method.
Background technique
Fiber grating have reflection bandwidth range is big, added losses are small, it is small in size, easily with fiber coupling, can be with other light
Device is compatible integral and a series of excellent properties such as is not influenced by environment dust, is all ten in fiber optic communication and sensory field
Divide important device.It is various that there are excellent properties in order to meet the different demands of every field with the development of science and technology
Fiber grating be developed.
Silica fibre is prepared in such a way that doping is drawn, and the covering of low-refraction and the fibre of high refractive index can be obtained
Core, to form the waveguide that can carry out single mode transport.Monocrystalline sapphire optical fiber is a kind of crystalline material, and fusing point reaches 2000 DEG C,
Thus there is excellent high temperature resistance, but monocrystalline sapphire optical fiber can only be prepared by way of crystal growth, Wu Fatong
Overdoping obtains the structure distribution of high refractive index fibre core and low-refraction covering, also can not just form the wave for carrying out single mode transport
It leads, is extremely unfavorable for the preparation of high quality optical fiber grating.
It is all directly to write light processed in sapphire fiber using femtosecond laser in the preparation method of existing sapphire fiber grating
Grid either can only all prepare sapphire multimode light by femtosecond laser phase mask plate method or the point-to-point method of femtosecond laser
Fine grating, insertion loss is big, and the spectral quality of acquisition is poor, and spectral bandwidth is wider, and spectrum can be sent out in the environment of temperature change
Change shape, is extremely unfavorable for signal demodulation, interferes use of the sapphire fiber in communication and sensory field.
Summary of the invention
Based on this, it is necessary to for the insertion loss of multimode sapphire fiber grating is big and the problem of spectral quality difference, mention
For a kind of single mode sapphire fiber grating and preparation method thereof.
A kind of preparation method of single mode sapphire fiber grating, comprising the following steps:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms the first focal beam spot, institute in the side at sapphire fiber center
Translation stage drives the sapphire fiber at the uniform velocity to move in the axial direction, and first focal beam spot is in the sapphire light
The first fried locus of points is formed in fibre；
The femto-second laser is adjusted, so that laser forms the second focal beam spot in the other side at sapphire fiber center,
Institute's translation stage drives the sapphire fiber at the uniform velocity to move in the axial direction, and second focal beam spot is in the sapphire
The second fried locus of points is formed in optical fiber, and waveguide is formed in sapphire fiber；
Grating processed is write in the waveguide, obtains single mode sapphire fiber grating.
The preparation method of above-mentioned single mode sapphire fiber grating drives sapphire fiber in the axial direction by displacement platform
It at the uniform velocity moves, laser irradiates at left and right sides of sapphire fiber center and formed the first fried locus of points and the second fried locus of points, blue
The place being irradiated with a laser in jewel optical fiber will form interior explosion, and density of material decline is so as to cause refractive index decline, simultaneously
Compactly extruding effect is centrally formed to sapphire fiber, causes the refractive index at sapphire fiber center to increase, is formed and be similar to stone
The low index distribution of the inside fibre core height and extramural cladding of English single mode optical fiber is able to achieve list to be formed in sapphire fiber
The waveguide of mould transmission.Since single mode sapphire fiber grating of the present invention is made of higher melting-point sapphire, can be applied to
The sensing of hyperthermal environments and transmission.
In one embodiment, the peak energy of the laser is 50~500nJ, and the diameter of the focal beam spot is 1
~10 μm, the pulse frequency of the laser is 1~250kHz.
In one embodiment, the sapphire fiber is the sapphire crystal of refractive index homogeneity.
In one embodiment, the step of writing grating processed in the single mode sapphire fiber includes femtosecond laser phase
Mask plate method, femtosecond laser double beam interferometry or femtosecond laser point by point method.
A kind of preparation method of single mode sapphire fiber grating, comprising the following steps:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms focal beam spot in the side at sapphire fiber center, meanwhile, institute
Translation stage drives the sapphire fiber at the uniform velocity to move in the axial direction；
The femto-second laser is adjusted, so that laser forms focal beam spot in the other side at sapphire fiber center, is carried out
Interrupted illuminating, and institute's translation stage drives the sapphire fiber at the uniform velocity to move in the axial direction, and single mode sapphire light is made
Fine grating.
In one embodiment, the peak energy of the laser is 50~500nJ, and the diameter of the focal beam spot is 1
~10 μm, the pulse frequency of the laser is 1~250kHz.
In one embodiment, the sapphire fiber is the sapphire crystal of refractive index homogeneity.
A kind of preparation method of single mode sapphire fiber grating, comprising the following steps:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms focal beam spot in the side at sapphire fiber center, meanwhile, institute
Translation stage drives the sapphire fiber rotation and at the uniform velocity moves in the axial direction, and the focal beam spot is in the sapphire
Helix is formed in optical fiber and fries the locus of points, and single mode sapphire fiber grating is made.
A kind of single mode sapphire fiber grating is made by the preparation method of the single mode sapphire fiber grating.
In one embodiment, the single mode sapphire fiber grating includes sapphire fiber, the sapphire fiber
In be formed with waveguide and burst point layer, the burst point layer wraps up the waveguide, and the waveguide is 1 along the size of sapphire fiber radial direction
μm~10 μm, grating is formed in the waveguide.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of the preparation method of sapphire single mode optical fiber grating in first embodiment；
Fig. 2 is the schematic diagram of laser and sapphire fiber in sapphire single mode optical fiber grating preparation process；
Fig. 3 is the schematic diagram at another visual angle of laser and sapphire fiber shown in Fig. 2；
Fig. 4 is the structural schematic diagram of sapphire single mode optical fiber grating obtained in first embodiment；
Fig. 5 is the end structure illustration of the grating of sapphire single mode optical fiber shown in Fig. 4；
Fig. 6 is the flow chart of the preparation method of sapphire single mode optical fiber grating in second embodiment；
Fig. 7 is the structural schematic diagram of sapphire single mode optical fiber grating obtained in second embodiment；
Fig. 8 is the flow chart of the preparation method of sapphire single mode optical fiber grating in 3rd embodiment；
Fig. 9 is the structural schematic diagram of sapphire single mode optical fiber grating obtained in 3rd embodiment；
Figure 10 is the cross-sectional view of the grating of sapphire single mode optical fiber shown in Fig. 9；
Figure 11 is the side view of the grating of sapphire single mode optical fiber shown in Fig. 9.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to the accompanying drawings and embodiments, to this
Invention is described in further detail.It should be appreciated that the specific embodiments described herein are only used to explain the present invention,
And the scope of protection of the present invention is not limited.
In the first embodiment, Fig. 1, Fig. 2 and Fig. 3, a kind of preparation method of single mode sapphire fiber grating, packet are please referred to
Include following steps:
Sapphire fiber a is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that the vertical directive sapphire fiber a of laser of femto-second laser b transmitting；
Femto-second laser b is adjusted, so that laser forms the first focal beam spot, displacement in the side at the center sapphire fiber a
Platform drives sapphire light a fibre at the uniform velocity to move in the axial direction, and the first focal beam spot forms the first fried point in sapphire fiber a
Track；
Femto-second laser b is adjusted, so that laser forms the second focal beam spot, position in the other side at the center sapphire fiber a
Moving platform drives sapphire light a fibre at the uniform velocity to move in the axial direction, and it is fried that the second focal beam spot forms second in sapphire fiber a
The locus of points forms waveguide in sapphire fiber；
Grating processed is write in the waveguide, obtains single mode sapphire fiber grating.
The preparation method of above-mentioned single mode sapphire fiber grating drives sapphire fiber in the axial direction by displacement platform
It at the uniform velocity moves, laser irradiates at left and right sides of sapphire fiber center and formed the first fried locus of points and the second fried locus of points, blue
The place being irradiated with a laser in jewel optical fiber will form interior explosion, and density of material decline declines to refractive index, while to indigo plant
Jewel optical fiber is centrally formed compactly extruding effect, so that the refractive index at sapphire fiber center increases, is formed and is similar to quartz list
The low index distribution of the inside fibre core height and extramural cladding of mode fiber is able to achieve single mode biography to be formed in sapphire fiber
Fiber grating processed is then write in defeated waveguide in the waveguide.Since single mode sapphire fiber grating of the present invention is using higher melting-point
Sapphire is made, and can be applied to sensing and the transmission of hyperthermal environments；Single mode is prepared in sapphire fiber by elder generation
Fiber grating processed is then write in waveguide, can obtain the single mode sapphire fiber grating of low-loss and narrow bandwidth.
The working principle of fiber grating is as follows: wideband light source is injected in fiber grating, with the Bradley lattice wave of grating in spectrum
Narrow spectrum centered on length is reflected at grating, other parts transmission simultaneously along former direction transmit, when the temperature varies or
When generating strain, so that the variations in refractive index of fibre core, and cause the change of central wavelength, due to raster center wavelength change with
Grating temperature, which changes (strain), has linear relationship, measures the knots modification of the central wavelength of grating, can calculate temperature (strain).
The peak energy of laser is 50~500nJ, and the diameter of focal beam spot is 1~10 μm, the pulse frequency of laser is 1~
250kHz.It is optimized by the parameters to laser, so that preparation is able to achieve the wave of single mode transport in sapphire fiber
It leads, reduces transmission mode quantity；Waveguide continuity is improved, the transmission loss of the single mode waveguide of sapphire fiber is reduced；Ensure
Two type waveguides (waveguide formed by physical deformation) is prepared in sapphire fiber, increases the single mode formed in sapphire fiber
The high temperature resistance of waveguide.
Sapphire fiber is the sapphire crystal of refractive index homogeneity.
The step of writing grating processed in single mode sapphire fiber includes femtosecond laser phase mask plate method, the double light of femtosecond laser
Beam interferometer method or femtosecond laser point by point method.
Wherein, femtosecond laser phase mask plate method the following steps are included:
Single mode sapphire fiber is clamped and is fixed on displacement platform, between laser and single mode sapphire fiber according to
Secondary placement cylindrical lens and phase mask plate adjust phase mask plate and cylindrical lens to the position perpendicular with laser light incident direction；
It is parallel with phase mask plate to adjust single mode sapphire fiber, by displacement platform drive single mode sapphire fiber to leaning on
The direction movement of nearly phase mask plate.
The laser that laser is launched is divided into the laser that two beams are formed with angle by phase mask plate, forms interference,
Single mode sapphire fiber is blue precious in single mode using the energy strength distribution of two beam interferometer laser during the phase mask plate
Grating processed is write in stone optical fiber.
Referring to Fig. 4, single mode sapphire fiber made from a kind of preparation method as above-mentioned single mode sapphire fiber grating
Grating 100, the waveguide 20 including sapphire fiber 10 and positioned at the middle part of sapphire fiber 10 are formed with grating 21 in waveguide 20.
Fig. 4 and Fig. 5 are please referred to, laser irradiates at left and right sides of sapphire fiber center and forms the first fried 30 He of the locus of points
The second fried locus of points 40, the place being irradiated with a laser in sapphire fiber will form interior explosion, and density of material decline is to roll over
Rate decline is penetrated, while compactly extruding effect is centrally formed to sapphire fiber, so that the refractive index at sapphire fiber center increases,
Form the index distribution low similar to the inside fibre core height and extramural cladding of quartz single mode fiber, i.e., centrally located waveguide 20
Refractive index is higher, forms the lower empty layer 50 of refractive index around waveguide 20.
In a second embodiment, Fig. 2, Fig. 3 and Fig. 6, a kind of preparation method of single mode sapphire fiber grating, packet are please referred to
Include following steps:
Sapphire fiber a is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that the vertical directive sapphire fiber a of laser of femto-second laser b transmitting；
Femto-second laser b is adjusted, so that laser forms focal beam spot in the side at the center sapphire fiber a, meanwhile, displacement
Platform drives sapphire fiber a at the uniform velocity to move in the axial direction；
Femto-second laser b is adjusted, so that laser forms focal beam spot in the other side at the center sapphire fiber a, between progress
Disconnected irradiation, and displacement platform drives sapphire fiber a at the uniform velocity to move in the axial direction, and single mode sapphire fiber grating is made.
The preparation method of above-mentioned single mode sapphire fiber grating drives sapphire fiber in the axial direction by displacement platform
It at the uniform velocity moves, laser irradiates and formed track, the ground being irradiated with a laser in sapphire fiber in sapphire fiber center left
Side will form interior explosion, and density of material decline is centrally formed extruding to sapphire fiber and causes so as to cause refractive index decline
Close effect causes the refractive index at sapphire fiber center to increase.Further, interruption photograph is carried out to sapphire fiber central right
It penetrates, compactly extruding effect on the one hand is centrally formed to sapphire fiber and causes variations in refractive index, to form wave connection lead structure；
On the other hand, fiber grating is formed in sapphire fiber so that refractive index forms interruption modulation due to interrupted illuminating.Due to
Single mode sapphire fiber grating of the present invention is made of higher melting-point sapphire, and the signal that can be applied to hyperthermal environments passes
Sense and transmission.
Specifically, referring to Fig. 7, focal beam spot forms the fried locus of points 230 in the side at sapphire fiber center first, and
The intermittent fried locus of points 240 is formed in the other side at sapphire fiber center afterwards.
The peak energy of laser is 50~500nJ, and the diameter of focal beam spot is 1~10 μm, the pulse frequency of laser is 1~
250kHz.It is optimized by the parameters to laser, so that preparation is able to achieve the wave of single mode transport in sapphire fiber
It leads, reduces transmission mode quantity；Waveguide continuity is improved, the transmission loss of the single mode waveguide of sapphire fiber is reduced；Ensure
Two type waveguides (waveguide formed by physical deformation) is prepared in sapphire fiber, increases the single mode formed in sapphire fiber
The high temperature resistance of waveguide.
Sapphire fiber is the sapphire crystal of refractive index homogeneity.
Referring to Fig. 7, single mode sapphire fiber made from a kind of preparation method as above-mentioned single mode sapphire fiber grating
Light 200, the waveguide 220 including sapphire fiber 210 and in the middle part of sapphire fiber are formed with grating 221 in waveguide 220.
In the third embodiment, referring to Fig. 8, a kind of preparation method of single mode sapphire fiber grating includes following step
It is rapid:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that the vertical directive sapphire fiber of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms focal beam spot in the side at sapphire fiber center, meanwhile, position
It moves platform to drive sapphire fiber rotation and at the uniform velocity move in the axial direction, single mode sapphire fiber grating is made.
In the present embodiment, displacement platform drives sapphire fiber rotation and at the uniform velocity moves in the axial direction, to focus
Hot spot forms helix in sapphire fiber and fries the locus of points, which fries the locus of points centered on the axis of sapphire fiber
On the one hand line is centrally formed compactly extruding effect to sapphire fiber, so that the refractive index at sapphire fiber center increases, formed
Similar to the low index distribution of the inside fibre core height and extramural cladding of quartz single mode fiber, to be formed in sapphire fiber
It is able to achieve the waveguide of single mode transport；On the other hand, each unit of spiral trajectory is formed with interval, so that being formed in waveguide
Single mode sapphire fiber grating is finally made in grating.
Specifically, please referring to Fig. 9, Figure 10 and Figure 11, single mode sapphire fiber grating 300 includes sapphire fiber 310, is gathered
Burnt hot spot forms helix in sapphire fiber 310 and fries the locus of points 330, which fries the locus of points 330 with sapphire fiber
310 axis is center line, on the one hand compactly extruding effect is centrally formed to sapphire fiber 310, so that sapphire fiber 310
The refractive index at center increases, and forms empty layer 350 around 310 central area part of sapphire fiber, formation is able to achieve single mode biography
Defeated waveguide 320；On the other hand, each unit that helix fries the locus of points 330 is formed with interval, so that being formed with light in waveguide
Grid (not shown).
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of preparation method of single mode sapphire fiber grating, which comprises the following steps:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms the first focal beam spot, institute's rheme in the side at sapphire fiber center
Moving platform drives the sapphire fiber at the uniform velocity to move in the axial direction, and first focal beam spot is in the sapphire fiber
Form the first fried locus of points；
The femto-second laser is adjusted, so that laser forms the second focal beam spot in the other side at sapphire fiber center, it is described
Displacement platform drives the sapphire fiber at the uniform velocity to move in the axial direction, and second focal beam spot is in the sapphire fiber
The second fried locus of points of middle formation, forms waveguide in sapphire fiber；
Grating processed is write in the waveguide, obtains single mode sapphire fiber grating.
2. the preparation method of single mode sapphire fiber grating according to claim 1, which is characterized in that the peak of the laser
Value energy is 50~500nJ, and the diameter of the focal beam spot is 1~10 μm, and the pulse frequency of the laser is 1~250kHz.
3. the preparation method of single mode sapphire fiber grating according to claim 1, which is characterized in that the sapphire light
Fibre is the sapphire crystal of refractive index homogeneity.
4. the preparation method of single mode sapphire fiber grating according to claim 1, which is characterized in that blue in the single mode
The step of writing grating processed in jewel optical fiber includes that femtosecond laser phase mask plate method, femtosecond laser double beam interferometry or femtosecond swash
Light point by point method.
5. a kind of preparation method of single mode sapphire fiber grating, which comprises the following steps:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms focal beam spot in the side at sapphire fiber center, meanwhile, institute's rheme
Moving platform drives the sapphire fiber at the uniform velocity to move in the axial direction；
The femto-second laser is adjusted, so that laser forms focal beam spot, the femtosecond in the other side at sapphire fiber center
Laser carries out interrupted illuminating, and institute's translation stage drives the sapphire fiber at the uniform velocity to move in the axial direction, is made single
Mould sapphire fiber grating.
6. the preparation method of single mode sapphire fiber grating according to claim 5, which is characterized in that the peak of the laser
Value energy is 50~500nJ, and the diameter of the focal beam spot is 1~10 μm, and the pulse frequency of the laser is 1~250kHz.
7. the preparation method of single mode sapphire fiber grating according to claim 5, which is characterized in that the sapphire light
Fibre is the sapphire crystal of refractive index homogeneity.
8. a kind of preparation method of single mode sapphire fiber grating, which comprises the following steps:
Sapphire fiber is clamped and is fixed on displacement platform；
Displacement platform is adjusted, so that sapphire fiber described in the vertical directive of laser of femto-second laser transmitting；
The femto-second laser is adjusted, so that laser forms focal beam spot in the side at sapphire fiber center, meanwhile, institute's rheme
It moves platform to drive the sapphire fiber rotation and at the uniform velocity move in the axial direction, the focal beam spot is in the sapphire fiber
Middle formation helix fries the locus of points, and single mode sapphire fiber grating is made.
9. a kind of single mode sapphire fiber grating, which is characterized in that by the described in any item single mode sapphire light of claim 1-8
The preparation method of fine grating is made.
10. single mode sapphire fiber grating according to claim 9, which is characterized in that the single mode sapphire fiber light
Grid include sapphire fiber, and waveguide and burst point layer are formed in the sapphire fiber, and the burst point layer wraps up the waveguide, institute
It is 1 μm~10 μm that waveguide, which is stated, along the size of sapphire fiber radial direction, is formed with grating in the waveguide.
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| CN201810195303.1A CN110244401A (en) | 2018-03-09 | 2018-03-09 | Single mode sapphire fiber grating and preparation method thereof |
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| CN201810195303.1A CN110244401A (en) | 2018-03-09 | 2018-03-09 | Single mode sapphire fiber grating and preparation method thereof |
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| CN111190250A (en) * | 2020-02-27 | 2020-05-22 | 江苏师范大学 | Method for automatically completing optical fiber core central axis tracing based on image recognition technology |
| CN113126201A (en) * | 2021-03-26 | 2021-07-16 | 中国科学院西安光学精密机械研究所 | Single crystal optical fiber based on space shaping and processing method and system thereof |
| CN113655563A (en) * | 2021-08-19 | 2021-11-16 | 吉林大学 | Spiral sapphire fiber Bragg grating, preparation method and application thereof |
| CN116282971A (en) * | 2023-03-17 | 2023-06-23 | 山东大学 | Preparation method of single-mode single-crystal optical fiber energy field constraint microstructure |
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| CN106526741A (en) * | 2016-12-27 | 2017-03-22 | 南京理工大学 | Device for manufacturing spiral core long-period fiber grating |
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| CN116282971A (en) * | 2023-03-17 | 2023-06-23 | 山东大学 | Preparation method of single-mode single-crystal optical fiber energy field constraint microstructure |
| CN116282971B (en) * | 2023-03-17 | 2024-05-28 | 山东大学 | Preparation method of single-mode single-crystal optical fiber energy field constraint microstructure |
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