CN106908949B - Device, the system and method for stable orbit angular momentum light beam are generated in a kind of optical fiber - Google Patents
Device, the system and method for stable orbit angular momentum light beam are generated in a kind of optical fiber Download PDFInfo
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- CN106908949B CN106908949B CN201710150334.0A CN201710150334A CN106908949B CN 106908949 B CN106908949 B CN 106908949B CN 201710150334 A CN201710150334 A CN 201710150334A CN 106908949 B CN106908949 B CN 106908949B
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- dislocation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0933—Systems for active beam shaping by rapid movement of an element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
Abstract
The present invention proposes the system that stable orbit angular momentum light beam is generated in a kind of optical fiber, the device including generating stable orbit angular momentum light beam in the optical fiber, for generating the laser of light beam；The coupler that light beam for will inject into is divided；First collimator, reflecting mirror, for generating the beam-splitter of interfering beam, CCD camera, the CCD camera receives the interfering beam that the beam-splitter is injected and by interfering beam real-time detection and is recorded as interference pattern signal.Device, the system and method for stable orbit angular momentum light beam are generated in optical fiber provided by the invention, the rotation of single bimodulus dislocation optical fiber is combined and realized by spin fiber rotating disk by fiber spinning disk and rectangular channel pedestal, separate single bimodulus dislocation original mode of optical fiber, and then orbital angular momentum light beam is generated in single bimodulus dislocation optical fiber, the orbital angular momentum beam intensity of generation uniformly, stablize, be not easy to disappear, debug accurate convenience.
Description
Technical field
The present invention relates to device, system and methods that stable orbit angular momentum light beam is generated in a kind of optical fiber, belong to optics
Device design field.
Background technique
In recent years, photon trajectory angular momentum has become international light area research hot spot, basic physics, Applied Physics with
And all there is important application value in the research of the cross disciplines such as astronomy, biology.With orbital angular momentum light beam special performance
With various applications, people gradually adopt a variety of methods to generate and control it.Orbital angular momentum light beam refers to fiber cross-sections
Phase has helical structure, the unusual light beam that central light strength is 0.The generation of orbital angular momentum light beam can use helical phase wave
Piece makes different angular light pass through the wave plate of different-thickness, generates angular phase delay.Existing technical solution higher cost and
Required device volume is larger, limits the widespread development of orbital angular momentum light beam generation technology to a certain extent.In recent years, it uses
Optical fiber generates orbital angular momentum light beam and gradually attracts attention.For conventional method, optical fiber has structure tight
Gather, it is at low cost, be lost it is low, can be into the features such as easily connection with photosystem, and the basic unit as long distance transmission optical signal
The feasibility of one step discussion transmission rail angular momentum.Currently, specifically including that benefit with the method that optical fiber generates orbital angular momentum light beam
With micro-bend grating, cause and etc. coupling between angular high-order mode, generate corresponding orbital angular momentum light beam；Utilize optical fiber
The special ring structure in section generates certain orbital angular momentum light beam；Track angle is constructed by the strain or deformation of fiber cross-sections
The corresponding mould field of momentum light beam；Using quickly and at a slow speed torsion or spin fiber, photonic crystal fiber support sandwich layer mould with angularly
The generation of respective carter angular momentum light beam is realized in coupling between high-order mode.
In the method for above-mentioned generation orbital angular momentum light beam, essence be all make inside of optical fibre because being under pressure, straining,
Torque etc. leads to the change of inside of optical fibre mode, to generate orbital angular momentum light beam.By changing be loaded on optical fiber two
Pressure between parallel-plate generates orbital angular momentum light beam, this improves the spirit for generating orbital angular momentum light beam to a certain extent
Activity, but the orbital angular momentum beam intensity for easily leading to generation is uneven, operating difficulties, and because mechanical pressure leads to deformation
Optical fiber can restore under long-time, cause the orbital angular momentum light beam generated unstable or disappear.Therefore, one kind is designed in optical fiber
The middle device for generating stable orbital angular momentum light beam has a very important significance, it, which can be reduced, generates orbital angular momentum light
The debugging difficulty of beam and stable orbital angular momentum light beam can be generated.
Summary of the invention
It is an object of the invention to overcome the shortcomings of to have to generate orbital angular momentum beam method, a kind of structure letter is proposed
Device single, easily prepared and that stable orbital angular momentum light beam can be generated in a fiber.
It adopts the following technical scheme that the device that stable orbit angular momentum light beam is generated in a kind of optical fiber, comprising:
Fiber spinning disk, rectangular channel pedestal and rotating disk fixing bolt；
The rectangular channel pedestal is equipped with rectangular recess, and the fiber spinning disk is set in the rectangular recess, described
Fiber spinning disk is patty, and fiber spinning disk center top is equipped with optical fiber mounting hole, is equipped in the fiber spinning disk
Fixation hole, the fixation hole intersect with the optical fiber mounting hole, and optical fiber fixing screws are threadedly connected in the fixation hole, Dan Shuan
Mould misplaces optical fiber across the optical fiber mounting hole, and light beam, which is injected in single bimodulus dislocation optical fiber to generate, has orbital angular momentum
Ring-beam；
Block is fixedly installed in rectangular channel pedestal two sides respectively, and the block upper end is higher than the circle of the fiber spinning disk
Plane where the heart, the rotating disk fixing bolt pass through the block and mutually press with the fiber spinning disk；
Rectangular channel pedestal lower end is connect with fixed plate, and the fixed plate is equipped with fixed hole.
Described device in the present invention is the device that stable orbit angular momentum light beam is generated in the optical fiber.
Further, single bimodulus dislocation optical fiber includes single mode optical fiber and the bimodulus with the single mode optical fiber dislocation welding
Optical fiber, the dual mode optical fiber pass through the optical fiber mounting hole.
Further, the magnitude of misalignment of single bimodulus dislocation optical fiber is 15 μm, and the single mode optical fiber core diameter is 9 μm, described
Dual mode optical fiber core diameter is 15 μm.
Further, Refractive Index of Material is 1.49 when the fiber spinning disk and the rectangular channel pedestal are 25 DEG C of room temperature
Polymethyl methacrylate.
Further, for fixing single bimodulus dislocation optical fiber and rotating the optical fiber of single bimodulus dislocation optical fiber
The radius of rotating disk is 20mm, with a thickness of 20mm；
A length of 41mm of the rectangular recess, width 20mm, a height of 20mm, the wide a height of 40mm of wall, wide wall thickness is 10mm, long
Wall thickness is 5mm；
A length of 20mm of the optical fiber mounting hole, width 6mm, a height of 3mm；
The optical fiber fixing screws of single bimodulus dislocation optical fiber for fixing in the optical fiber mounting hole are hexagonal
Headless screw, diameter 6mm, a length of 10mm；
A length of 70mm of the fixed plate, width 60mm, a height of 10mm；
The block upper end is equipped with fixing threaded hole, and the fixing threaded hole diameter is 6mm, the rotating disk fixing bolt screw thread
It is connected in the fixing threaded hole.
The system that stable orbit angular momentum light beam is generated in a kind of optical fiber, including generating stable orbit angle in the optical fiber
The device of momentum light beam,
For generating the laser of light beam；
The coupler that light beam for will inject into is divided, the light beam that the laser issues inject the coupler；
Light beam after the coupler light splitting injects the second collimator respectively and is misplaced described in optical fiber injection by single bimodulus
Device；
The light beam that described device is injected is converted directional light by first collimator, the first collimator；
The Ring-beam of reflecting mirror, the orbital angular momentum that the reflecting mirror exports the first collimator changes propagation side
To beam-splitter described in directive；
For generating the beam-splitter of interfering beam, described in the light beam that the reflecting mirror and second collimator project is injected
It is interfered in beam-splitter；
CCD camera, the CCD camera receive the interfering beam that the beam-splitter is injected and by interfering beam real-time detection simultaneously
It is recorded as interference pattern signal.
Further, the laser is distributed feedback laser, and the coupler is single-mode optical-fibre coupler, single mode
At single bimodulus dislocation optical fiber, the first collimator and second collimator will be penetrated for optical fiber and dual mode optical fiber dislocation welding
The light beam entered is converted into directional light, and the collimated light beam of input is converted into the Ring-beam of orbital angular momentum and defeated by described device
Out.
A kind of method that stable orbit angular momentum light beam is generated in optical fiber, including generating stable orbit angle in the optical fiber
The system that stable orbit angular momentum light beam is generated in the device of momentum light beam and the optical fiber, further comprising the steps of:
S1: laser generates light beam and injects coupler；
S2: the light beam after the coupler light splitting injects the second collimator respectively and injects institute by single bimodulus dislocation optical fiber
State device；
S3: the light beam by described device is converted into the Ring-beam with orbital angular momentum, turns by first collimator
Reflecting mirror is injected after turning to collimated light beam；
S4: the collimated light beam that the reflecting mirror projects and the Gaussian beam Jing Guo the second collimator inject beam-splitter respectively
Inside interfere to form interfering beam；
The interfering beam that the beam-splitter projects is converted interference pattern signal by S5:CCD camera；
S6: the CCD camera issues interference pattern signal and is transmitted to computer, and the computer is recorded and stored.
Further, the laser is distributed feedback laser, and the coupler is single-mode optical-fibre coupler, described
The light beam that coupler projects successively injects the first collimator by single bimodulus dislocation optical fiber and described device, and described the
The light beam that collimator and second collimator will inject into is converted into directional light, and the reflecting mirror changes the direction of propagation of light
Beam-splitter described in the orbital angular momentum light beam directive that the reflecting mirror is exported.
Further, the laser center wavelength be 1550nm, the coupler be splitting ratio be 1:1, operation wavelength
For 2 × 2 single-mode optical-fibre couplers of 1550nm；
The first collimator and second collimator convert dispersion angle for the transmitting beam in optical fiber and are no more than
2 ° of directional light；
For the collimated light beam of input being converted into orbital angular momentum light beam and the operation wavelength of described device exported is
1550nm；
Reflectivity for changing the reflecting mirror of the direction of propagation of light is higher than 85%；
The transflection ratio of the beam-splitter is 1:1.
The invention has the following advantages:
(1) device, the system and method that stable orbit angular momentum light beam is generated in a kind of optical fiber of the invention have bigger
Flexibility, smaller volume, better realizability, the orbital angular momentum light beam of generation is controllable, is more suitable for practical application；
(2) device, the system and method that stable orbit angular momentum light beam is generated in a kind of optical fiber of the invention, pass through optical fiber
Rotating disk and rectangular channel pedestal combine and realize by spin fiber rotating disk the rotation of single bimodulus dislocation optical fiber, make list
The bimodulus dislocation original mode of optical fiber separates, and then generates orbital angular momentum light beam in single bimodulus dislocation optical fiber, generation
Orbital angular momentum beam intensity is uniform, stablizes, is not easy to disappear, debugs accurate convenience；
(3) device, the system and method for stable orbit angular momentum light beam, whole operation are generated in a kind of optical fiber of the invention
The fiber spinning disk being fixed in rectangular channel pedestal need to be only rotated in the process, ensure that the stability of other parameters, with biography
The production method structure compared of system is more simplified, and use is more stable and accurate.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.It should be evident that the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings；
Fig. 1 is the structural schematic diagram that the device of stable orbit angular momentum light beam is generated in optical fiber of the present invention；
Fig. 2 is the structural schematic diagram that the system of stable orbit angular momentum light beam is generated in optical fiber of the present invention；
Fig. 3 (a) is that CCD camera collects when generating the device original state of stable orbit angular momentum light beam in the optical fiber
Image；When Fig. 3 (b) is the device generation orbital angular momentum Ring-beam for generating stable orbit angular momentum light beam in the optical fiber
CCD camera acquired image；
Fig. 4 is the experimental result picture that orbital angular momentum light beam is generated in present invention verifying optical fiber.
Wherein: 1, in optical fiber generate the device of stable orbit angular momentum light beam, 2, single bimodulus misplace optical fiber, 3, laser,
4, coupler, 5, beam-splitter, 6, first collimator, the 7, second collimator, 8, reflecting mirror, 9, CCD camera, 10, computer, 11,
Fiber spinning disk, 12, rectangular channel pedestal, 13, rotating disk fixing bolt, 14, optical fiber mounting hole, 15, fixation hole, 16, block,
17, fixed plate, 18, fixed hole, 21, single mode optical fiber, 22, dual mode optical fiber.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, with reference to the attached drawing in the embodiment of the present invention, to this
Technical solution in inventive embodiments carries out clear and complete description.
Embodiment 1
The device of stable orbit angular momentum light beam is generated in a kind of optical fiber, comprising:
Fiber spinning disk 11, rectangular channel pedestal 12 and rotating disk fixing bolt 13；
The rectangular channel pedestal 12 is equipped with rectangular recess, and the fiber spinning disk 11 is set in the rectangular recess,
The fiber spinning disk 11 is patty, and 11 central upper of fiber spinning disk is equipped with optical fiber mounting hole 14, the optical fiber rotation
Fixation hole 15 is equipped in turntable 11, the fixation hole 15 intersects with the optical fiber mounting hole 14, and optical fiber fixing screws are threadedly coupled
In in the fixation hole 15, single bimodulus dislocation optical fiber 2 passes through the optical fiber mounting hole 14, and light beam injects single bimodulus dislocation light
The Ring-beam for having orbital angular momentum is generated in fibre 2；
Block 16 is fixedly installed in 12 two sides of rectangular channel pedestal respectively, and 16 upper end of block is higher than the fiber spinning
Plane where the center of circle of disk 11, the rotating disk fixing bolt 13 pass through the block 16 and the 11 phase pressure of fiber spinning disk
It closes；
12 lower end of rectangular channel pedestal is connect with fixed plate 17, and the fixed plate 17 is equipped with fixed hole 18.
Described device 1 in the present invention is the device 1 that stable orbit angular momentum light beam is generated in the optical fiber.
Further, single bimodulus dislocation optical fiber 2 include single mode optical fiber 21 and with 21 dislocation welding of single mode optical fiber
Dual mode optical fiber 22, the dual mode optical fiber 22 pass through the optical fiber mounting hole 14.
Further, the magnitude of misalignment of single bimodulus dislocation optical fiber 2 is 15 μm, and 21 core diameter of single mode optical fiber is 9 μm, institute
Stating 22 core diameter of dual mode optical fiber is 15 μm.
Further, Refractive Index of Material is when the fiber spinning disk 11 and the rectangular channel pedestal 12 are 25 DEG C of room temperature
1.49 polymethyl methacrylate.
Further, for fixing single bimodulus dislocation optical fiber 2 and rotating the light of single bimodulus dislocation optical fiber 2
The radius of fine rotating disk 11 is 20mm, with a thickness of 20mm；
A length of 41mm of the rectangular recess, width 20mm, a height of 20mm, the wide a height of 40mm of wall, wide wall thickness is 10mm, long
Wall thickness is 5mm；
A length of 20mm of the optical fiber mounting hole 14, width 6mm, a height of 3mm；
The optical fiber fixing screws of single bimodulus dislocation optical fiber 2 for fixing in the optical fiber mounting hole 14 are six
Angle headless screw, diameter 6mm, a length of 10mm；
A length of 70mm of the fixed plate 17, width 60mm, a height of 10mm；
16 upper end of block is equipped with fixing threaded hole, and the fixing threaded hole diameter is 6mm, the rotating disk fixing bolt 13
It is threadedly connected in the fixing threaded hole.
Embodiment 2
The system that stable orbit angular momentum light beam is generated in a kind of optical fiber, including generating stable orbit angle in the optical fiber
The device 1 of momentum light beam,
For generating the laser 3 of light beam；
The coupler 4 that light beam for will inject into is divided, the light beam that the laser 3 issues inject the coupler
4；
Light beam after the coupler 4 is divided injects the second collimator 7 respectively and injects institute by single bimodulus dislocation optical fiber 2
State device 1；
The light beam that described device 1 is injected is converted directional light by first collimator 6, the first collimator 6；
Reflecting mirror 8, the Ring-beam for the orbital angular momentum that the reflecting mirror 8 exports the first collimator 6, which changes, to be passed
Broadcast beam-splitter 5 described in the directive of direction；
For generating the beam-splitter 5 of interfering beam, the light beam that the reflecting mirror 8 and second collimator 7 project is injected
It is interfered in the beam-splitter 5；
CCD camera 9, the CCD camera 9 receive the interfering beam that the beam-splitter 5 is injected and examine interfering beam in real time
It surveys and is recorded as interference pattern signal.
Further, the laser 3 is distributed feedback laser 3, and the coupler 4 is single-mode optical-fibre coupler,
Single mode optical fiber 21 and 22 dislocation welding of dual mode optical fiber are at single bimodulus dislocation optical fiber 2, the first collimator 6 and described second
The light beam that collimator 7 will inject into is converted into directional light, and the collimated light beam of input is converted into the circle of orbital angular momentum by described device 1
Ring light beam simultaneously exports.
The laser 3 generates light beam, and light beam of the light beam after the coupler 4 light splitting injects the second collimator respectively
7 and by single bimodulus misplace optical fiber 2 inject in the optical fiber generate stable orbit angular momentum light beam device 1, described device 1 will
Light beam is converted into the Ring-beam with orbital angular momentum, and it is quasi- that the Ring-beam with orbital angular momentum successively passes through described first
The light beam that beam-splitter 5 described in 8 directive of straight device 6 and the reflecting mirror, the reflecting mirror 8 and second collimator 7 project is injected
It is interfered in the beam-splitter 5, the light beam after interference injects the CCD camera 9, and the CCD camera 9 is real-time by interfering beam
Interference pattern is detected and be recorded as, and interference pattern signal is transmitted to the computer 10.
Embodiment 3
A kind of method that stable orbit angular momentum light beam is generated in optical fiber, including generating stable orbit angle in the optical fiber
The system that stable orbit angular momentum light beam is generated in the device 1 and the optical fiber of momentum light beam, further comprising the steps of:
S1: laser 3 generates light beam and injects coupler 4；
S2: the light beam after the coupler 4 is divided is injected the second collimator 7 respectively and is penetrated by single bimodulus dislocation optical fiber 2
Enter described device 1；
S3: the light beam by described device 1 is converted into the Ring-beam with orbital angular momentum, by first collimator 6
Reflecting mirror 8 is injected after being converted into collimated light beam；
S4: the collimated light beam that the reflecting mirror 8 projects and the Gaussian beam Jing Guo the second collimator 7 inject light splitting respectively
It interferes to form interfering beam in plate 5；
The interfering beam that the beam-splitter 5 projects is converted interference pattern signal by S5:CCD camera 9；
S6: the CCD camera 9 issues interference pattern signal and is transmitted to computer 10, the computer 10 carry out record and
Storage.
Further, the laser 3 is distributed feedback laser 3, and the coupler 4 is single-mode optical-fibre coupler,
The light beam that the coupler 4 projects successively injects the first collimator by single bimodulus dislocation optical fiber 2 and described device 1
6, the light beam that the first collimator 6 and second collimator 7 will inject into is converted into directional light, and the reflecting mirror 8 changes light
Beam-splitter 5 described in the orbital angular momentum light beam directive that the direction of propagation of line exports the reflecting mirror 8.
Further, 3 central wavelength of laser be 1550nm, the coupler 4 be splitting ratio be 1:1, operating wave
2 × 2 single-mode optical-fibre couplers of a length of 1550nm；
The first collimator 6 and second collimator 7 convert dispersion angle for the transmitting beam in optical fiber and do not surpass
Cross 2 ° of directional light；
For the collimated light beam of input being converted into orbital angular momentum light beam and the operation wavelength of described device 1 exported is
1550nm；
Reflectivity for changing the reflecting mirror 8 of the direction of propagation of light is higher than 85%；
The transflection ratio of the beam-splitter 5 is 1:1.
Embodiment 4
The present invention proposes device, system and method that stable orbit angular momentum light beam is generated in a kind of optical fiber, described device
Structure chart is as shown in Figure 1, it is made of the fiber spinning disk 11 of patty and rectangular channel pedestal 12.The device is by polymethyl
Sour formicester material is by being machined, and refractive index is 1.49 at 25 DEG C of the material room temperature.In the construction shown in fig. 1, circle
Cake radius is 20mm, and with a thickness of 20mm, 11 overcentre of fiber spinning disk is equipped with optical fiber mounting hole 14, the optical fiber installation
A length of 20mm in hole 14, width 6mm, a height of 3mm, be embedded in right above the optical fiber mounting hole 14 in hexagonal headless screw, diameter
6mm, a length of 10mm, for the fixed single bimodulus dislocation optical fiber 2 being put into the optical fiber mounting hole 14；By the fiber spinning disk
11 are put into the rectangular channel pedestal 12, a length of 41mm of rectangular recess in the rectangular channel pedestal 12, width 20mm, a height of
20mm, the wide a height of 40mm of wall, higher than the radius of the fiber spinning disk 11, for keeping the rotation of fiber spinning disk 11 more square
Just, the two sides of the rectangular recess are equipped with block 16, and 16 thickness of block is 10mm, and long wall thickness is 5mm, set on the block 16
There is rotating disk fixing bolt 13, for fixing the postrotational fiber spinning disk 11,13 bolt of rotating disk fixing bolt
Diameter is 6mm, a length of 25mm；A length of 70mm, width 60mm, the fixation of a height of 10mm are fixedly connected in 12 lower end of rectangular channel pedestal
Plate 17, it is the screw hole of 6mm that, which respectively there are a diameter in 17 two sides of fixed plate, for described device 1 to be fixed to experimental bench.Institute
Stating fiber spinning disk 11 is adjustable controllable fiber spinning apparatus, when the working condition of described device 1, passes through the rotation Dan Shuan
Mould dislocation optical fiber 2 makes single bimodulus dislocation optical fiber 2 be acted on by torque and generate pressure, and then transmits inside of optical fibre
LP11 mode separates, and makes LP11 modal cutoff LP11a mode and LP11b mode, adjusts to LP11a mode and LP11b
When phase difference between mode is pi/2, the Ring-beam for having orbital angular momentum is generated.
Fig. 2 is the systematic schematic diagram for generating stable orbital angular momentum light beam in a fiber using apparatus of the present invention verifying.
Laser 3 is used as light source, and the light beam that it is issued is divided into two bundles independent light beam through coupler 4.Wherein light beam is coupled to band
Have in single dual mode optical fiber dislocation optical fiber, is generated after generating the device 1 of stable orbit angular momentum light beam in optical fiber and have track
The Ring-beam of angular momentum issues collimated light beam by first collimator 6, changes optical propagation direction after reflecting mirror 8 and shine
It is mapped on beam-splitter 5；Another light beams generate parallel Gaussian beam through the second collimator 7 by single mode optical fiber, and two-beam converges
Gather and interfered at the beam-splitter 5, generates interference pattern.By the variation of 9 real-time detection interference pattern of CCD camera, so
Afterwards, the data that computer 10 acquires the CCD camera 9 carry out processing analysis, to obtain experimental result.It is produced in above-mentioned optical fiber
In the service system of raw stable orbit angular momentum light beam, the laser 3 uses the distributed feedback laser of 100kHz line width,
The wherein a length of 1550nm of cardiac wave, the coupler 4 are 2 × 2 single-mode optical-fibre couplers, and splitting ratio 1:1, service band is
1550nm；The list bimodulus dislocation optical fiber 2 is the optical fiber that single mode optical fiber is connect with dual mode optical fiber dislocation welding, and magnitude of misalignment is 15 μ
M, single mode optical fiber core diameter are 9 μm, and dual mode optical fiber core diameter is 15 μm；The first collimator 6 and second collimator 7 are by optical fiber
Interior transmission light becomes directional light, it is desirable that dispersion angle is no more than 2 °；The reflecting mirror 8 for changing light the direction of propagation,
Reflectivity is higher than 85%；The model NPCH-20-15500 of the beam-splitter 5, transflection ratio are 1:1；The type of the CCD camera 9
Number be Digital CamIR1550, maximum resolution be 1296 × 964.
The system that stable orbital angular momentum light beam is generated in the optical fiber is built according to fig. 2, and described device 1 is fixed
Onto experimental bench.Single bimodulus dislocation optical fiber 2 is put into the optical fiber mounting hole 14, is fixed by interior hexagonal headless screw
Good single bimodulus dislocation optical fiber 2, and the interior hexagonal headless screw is completely embedded into the optical fiber mounting hole 14, prevent institute
Stating optical fiber mounting hole 14 influences the rotation of the fiber spinning disk 11.
As shown in figure 3, when described device 1 is not had an effect, 9 acquired image of CCD camera such as Fig. 3 a at this time
It is shown.In the case where guaranteeing that other conditions are constant, rotates the fiber spinning disk 11 and observe in the CCD camera 9
Image constantly changes, and when image is at circular ring structure, as shown in Figure 3b, expression has generated orbital angular momentum annulus light
Beam stops rotating and the fiber spinning disk 11 and fixes the fiber spinning disk with the rotating disk fixing bolt on rectangular channel pedestal
11.The circular ring shape beam energy distribution of the generation it can be seen from Fig. 3 b is relatively uniform, without obvious brightness unevenness phenomenon；It generates
Ring-beam is stablized, and will not change over time and change；It is convenient to debug in whole experiment process, saves experimental period.
As shown in figure 4, in the constant situation of other conditions, to generating stable orbital angular momentum light in the optical fiber
The annular beam that the device 1 of beam generates is verified, and systematic schematic diagram, which is built, according to fig. 2 generates stable track in the optical fiber
The system of angular momentum light beam, Fig. 4 are to verify its experimental result picture for whether generating orbital angular momentum light beam in a fiber.Pass through list
The Gaussian beam of mode fiber and Ring-beam with orbital angular momentum interfere, and interference image is fork-shaped pattern.From Fig. 4
Experimental result to can be seen that the image after the two-way interference of light be really fork-shaped pattern, to prove that device generates through the invention
Annular beam be orbital angular momentum light beam.
By adopting the above-described technical solution, generating the dress of stable orbit angular momentum light beam in optical fiber provided by the invention
It sets, system and method, there is greater flexibility, smaller volume, better realizability, the orbital angular momentum light beam of generation
Controllably, it is more suitable for practical application；It is combined by fiber spinning disk and rectangular channel pedestal and by spin fiber rotating disk
It realizes the rotation of single bimodulus dislocation optical fiber, separates single bimodulus dislocation original mode of optical fiber, and then misplace in single bimodulus
Orbital angular momentum light beam is generated in optical fiber, the orbital angular momentum beam intensity of generation is uniform, stablizes, is not easy to disappear, debug
It is accurate convenient；The fiber spinning disk being fixed in rectangular channel pedestal only need to be rotated during whole operation, ensure that other
The stability of parameter is more simplified with traditional production method structure compared, and use is more stable and accurate.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. generating the device of stable orbit angular momentum light beam in a kind of optical fiber characterized by comprising
Fiber spinning disk, rectangular channel pedestal and rotating disk fixing bolt；
The rectangular channel pedestal is equipped with rectangular recess, and the fiber spinning disk is set in the rectangular recess, the optical fiber
Rotating disk is patty, and fiber spinning disk center top is equipped with optical fiber mounting hole, is equipped with and fixes in the fiber spinning disk
Hole, the fixation hole intersect with the optical fiber mounting hole, and optical fiber fixing screws are threadedly connected in the fixation hole, and single bimodulus is wrong
Position optical fiber passes through the optical fiber mounting hole, and light beam is injected in single bimodulus dislocation optical fiber and generates the annulus for having orbital angular momentum
Light beam；
Block is fixedly installed in rectangular channel pedestal two sides respectively, and the block upper end is higher than the center of circle institute of the fiber spinning disk
In plane, the rotating disk fixing bolt passes through the block and mutually presses with the fiber spinning disk；
Rectangular channel pedestal lower end is connect with fixed plate, and the fixed plate is equipped with fixed hole.
2. the device of stable orbit angular momentum light beam is generated in optical fiber according to claim 1, it is further characterized in that: it is described
Single bimodulus dislocation optical fiber includes single mode optical fiber and the dual mode optical fiber with the single mode optical fiber dislocation welding, and the dual mode optical fiber passes through
The optical fiber mounting hole.
3. the device of stable orbit angular momentum light beam is generated in optical fiber according to claim 2, it is further characterized in that: it is described
The magnitude of misalignment of single bimodulus dislocation optical fiber is 15 μm, and the single mode optical fiber core diameter is 9 μm, and the dual mode optical fiber core diameter is 15 μm.
4. the device of stable orbit angular momentum light beam is generated in optical fiber according to claim 1, it is further characterized in that: it is described
The polymethyl methacrylate that Refractive Index of Material is 1.49 when fiber spinning disk and the rectangular channel pedestal are 25 DEG C of room temperature.
5. the device of stable orbit angular momentum light beam is generated in optical fiber according to claim 1, it is further characterized in that:
For fix single bimodulus dislocation optical fiber and rotate single bimodulus dislocation optical fiber the fiber spinning disk radius
For 20mm, with a thickness of 20mm；
A length of 41mm of the rectangular recess, width 20mm, a height of 20mm, the wide a height of 40mm of wall, wide wall thickness is 10mm, long wall thickness
For 5mm；
A length of 20mm of the optical fiber mounting hole, width 6mm, a height of 3mm；
The optical fiber fixing screws of single bimodulus dislocation optical fiber for fixing in the optical fiber mounting hole are that hexagonal is without a head
Screw, diameter 6mm, a length of 10mm；
A length of 70mm of the fixed plate, width 60mm, a height of 10mm；
The block upper end is equipped with fixing threaded hole, and the fixing threaded hole diameter is 6mm, and the rotating disk fixing bolt is threadedly coupled
In in the fixing threaded hole.
6. generating the system of stable orbit angular momentum light beam in a kind of optical fiber, it is characterised in that: including light described in claim 1
The device of stable orbit angular momentum light beam is generated in fibre,
For generating the laser of light beam；
The coupler that light beam for will inject into is divided, the light beam that the laser issues inject the coupler；
Light beam after the coupler light splitting injects the second collimator respectively and injects described device by single bimodulus dislocation optical fiber；
The light beam that described device is injected is converted directional light by first collimator, the first collimator；
The Ring-beam for the orbital angular momentum that the first collimator exports is changed the direction of propagation and penetrated by reflecting mirror, the reflecting mirror
To the beam-splitter；
For generating the beam-splitter of interfering beam, the light beam that the reflecting mirror and second collimator project injects the light splitting
It is interfered in plate；
CCD camera, the CCD camera receive the interfering beam that the beam-splitter is injected and by interfering beam real-time detection and record
For interference pattern signal.
7. the system that stable orbit angular momentum light beam is generated in optical fiber according to claim 6, it is further characterized in that: it is described
Laser is distributed feedback laser, and the coupler is single-mode optical-fibre coupler, and single mode optical fiber and dual mode optical fiber dislocation are molten
It is connected into single bimodulus dislocation optical fiber, the first collimator is converted into parallel with the light beam that second collimator will inject into
The collimated light beam of input is converted into Ring-beam and the output of orbital angular momentum by light, described device.
8. generating the method for stable orbit angular momentum light beam in a kind of optical fiber, it is characterised in that: including light as claimed in claim 6
The system that stable orbit angular momentum light beam is generated in fibre, further comprising the steps of:
S1: laser generates light beam and injects coupler；
S2: the light beam after the coupler light splitting injects the second collimator respectively and injects the dress by single bimodulus dislocation optical fiber
It sets；
S3: the light beam by described device is converted into the Ring-beam with orbital angular momentum, is converted by first collimator
Reflecting mirror is injected after collimated light beam；
S4: the collimated light beam that the reflecting mirror projects and the Gaussian beam Jing Guo the second collimator inject hair in beam-splitter respectively
Raw interference forms interfering beam；
The interfering beam that the beam-splitter projects is converted interference pattern signal by S5:CCD camera；
S6: the CCD camera issues interference pattern signal and is transmitted to computer, and the computer is recorded and stored.
9. the method that stable orbit angular momentum light beam is generated in optical fiber according to claim 8, it is further characterized in that: it is described
Laser is distributed feedback laser, and the coupler is single-mode optical-fibre coupler, and the light beam that the coupler projects is successively
The first collimator, the first collimator and second standard are injected by single bimodulus dislocation optical fiber and described device
The light beam that straight device will inject into is converted into directional light, and the reflecting mirror changes the rail that the direction of propagation of light exports the reflecting mirror
Beam-splitter described in road angular momentum light beam directive.
10. the method that stable orbit angular momentum light beam is generated in optical fiber according to claim 9, it is further characterized in that: institute
Stating laser center wavelength is 1550nm, and the coupler is 2 × 2 single-mode optics that splitting ratio is 1:1, operation wavelength is 1550nm
Fine coupler；
The first collimator and second collimator convert dispersion angle for the transmitting beam in optical fiber and are no more than 2 °
Directional light；
For the collimated light beam of input being converted into orbital angular momentum light beam and the operation wavelength of described device exported is
1550nm；
Reflectivity for changing the reflecting mirror of the direction of propagation of light is higher than 85%；
The transflection ratio of the beam-splitter is 1:1.
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| CN110459941B (en) * | 2019-07-30 | 2021-01-19 | 华南理工大学 | 8-shaped cavity orbital angular momentum mode-locked fiber laser |
| CN111323903B (en) * | 2020-02-17 | 2021-09-28 | 南京师范大学 | Optical fiber orbital angular momentum mode separation method based on spiral structure |
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| CN104698541A (en) * | 2015-03-09 | 2015-06-10 | 哈尔滨工程大学 | Generating device for radial polarized light |
| CN104808294A (en) * | 2015-04-28 | 2015-07-29 | 上海大学 | Wide-angle rotation optical fiber device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104698541A (en) * | 2015-03-09 | 2015-06-10 | 哈尔滨工程大学 | Generating device for radial polarized light |
| CN104808294A (en) * | 2015-04-28 | 2015-07-29 | 上海大学 | Wide-angle rotation optical fiber device |
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| Title |
|---|
| Generation of azimuthally and radially polarized beams by coherent polarization beam combination;Pengfei Ma etal;《OPTICS LETTERS》;20120701;第37卷(第13期);2658-2660 |
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