CN101814328B - Composite optical eddy generation method and device thereof - Google Patents
Composite optical eddy generation method and device thereof Download PDFInfo
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- CN101814328B CN101814328B CN2010101325996A CN201010132599A CN101814328B CN 101814328 B CN101814328 B CN 101814328B CN 2010101325996 A CN2010101325996 A CN 2010101325996A CN 201010132599 A CN201010132599 A CN 201010132599A CN 101814328 B CN101814328 B CN 101814328B
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Abstract
The invention relates to a composite optical eddy generation method and a device thereof. The invention is characterized in that the method and the device belong to the method and the device for compounding eddies through the coaxial overlapping of various optical eddies realized by the angle multiplexing polyad storage technology. The device comprises a light path and a generation device, wherein the light path uses the angle multiplexing technology for realizing the polyad holographical storage and reoccurrence, the light path can realize the holographical storage and reoccurrence of various different optical eddies, the generation device is used for generating the optical eddies, and the generation device can generate different optical eddies according to the requirements. Different light irradiation body holographical recording media are controlled through computer programming for reproducing different eddy combinations, so the coaxial overlapping of different optical eddies is realized for generating composite eddies. The invention satisfies the coaxality and high diffraction efficiency of different optical eddies. In addition, because the method can increase the storage capacity of the optical eddies through changing the incidence angle of the reference light, the composite eddy generation method of the invention is simple and is easy to regulate, and in addition, the obtained composite eddies have various types.
Description
Technical field
The present invention relates to a kind of production method and device thereof of composite optical eddy, is that the angular multiplexed body holographic memory of a kind of usefulness mode realizes the coaxial stack of many vortexs, produces the method for new complicated vortex through the stack of optical eddy and optical eddy.
Background technology
Optical eddy in nearly decades because its unique phase structure has all received concern widely with topological property in fields such as fundamental research and applied researcies.At optical field; If there is the phase place singular point in the center of light wave fields; And phase place changes around this singular point in the shape of a spiral continuously, and the light wave wavefront can rotate around a line on the direction of propagation in a spiral manner, forms spiral wavefront; This is similar to the vortex phenomenon in the fluid very much, so this quasi-optical wave is called as " optical eddy " (Optical Vortices).
Optical eddy is a kind of light field of uniqueness, and its screw type wavefront makes it to produce bigger orbital angular momentum with unique phase structure and novel topological property, successfully it has been shifted to particulate at present and has realized controlling particulate.Generally be used for the optical eddy that particulate controls and be mostly that wavefront contains the single vortex of a phase place singular point, and the many vortex structures that contain a plurality of phase place singular points can carry out multiple independently optics constraint.Because combined vortex can produce novel topological structure and intensity distributions, can satisfy the requirement of many vortex structures, therefore caused extensive concern.
Just analyzed the vortex stack of two parallel not conllinear as far back as people such as I.D.Maleev in 2003 and G.A.Swartzlander; Describe the optical phase singular point with the relative phase of two vortexs or the situation of change of amplitude, and obtained the critical condition that vortex produces and buries in oblivion.Conllinear stack research to optical eddy in recent years increases gradually, and wherein E.J.Galvez leader's research group is devoted to research in this respect in the period of 2006-2009, has drawn the regularity of distribution of the combined vortex that produces after the stack of two vortexs.
The stack of a plurality of vortexs produces new vortex and distributes; At present many a plurality of vortexs under different condition, superpose distribution or its regularities of distribution of generation combined vortex studied theoretically; And the introduction that obtains combined vortex through experiment seldom, utilizes Mach-Zehnder (Mach-Zehnder) optical interference circuit of two nested types to realize the coaxial stack of two vortexs (the topological charge value is integer or decimal) experimentally such as E.J.Galvez leader's research group.The method is convenient to control respectively the relative intensity and the phase place of interfering two optical eddies on the arm, but regulates the parallel and coaxial difficult of two optical eddies, and superposes for the coaxial interference of a plurality of (＞2) vortex that to implement difficulty bigger.
Summary of the invention
The technical matters that solves
Weak point for fear of prior art; The present invention proposes a kind of production method and device thereof of composite optical eddy; Realize the coaxial stack of many vortexs through angular multiplexed body holographic memory mode, produce the style of new complicated vortex through the stack of optical eddy and optical eddy.
Thought of the present invention is: thus adopt angular multiplexed polyad memory technology to realize the method and the device thereof of the coaxial stack combined vortex of a plurality of optical eddies; Comprise and utilize angular multiplexed technology to realize the light path of polyad holographic memory and reproduction, this light path can realize body holographic memory and the reproduction to a plurality of different optical vortexs; And the generating device of a generation optical eddy, this device can produce different optical eddies as requested.Control different reference light irradiation body holographic recording mediums through computer programming and produce combined vortex with the coaxial stack that realizes the different optical vortex to reproduce different vortex combinations.
Technical scheme
A kind of production method of composite optical eddy is characterized in that step is following:
Step 1: the light of laser emitting is divided into two bundle coherent lights, wherein a branch of vortex modulation formation vortex light beam O that carries out
1Vortex light beam O
1With another bundle reference light R
1Incide with an angle and to obtain first width of cloth interference solid hologram in the volume holographic storage media;
Step 2: with reference light R
1Deflection angle Δ θ becomes new reference light R
2, with vortex light beam O
1Carry out the vortex modulation and form new vortex light beam O
2, reference light R
2With vortex light beam O
2Interfere another volume hologram of formation with the same position of new angle in volume holographic storage media, accomplish second width of cloth recording of information; Said deflection angle Δ θ be 0.02 spend to 0.06 the degree;
Step 3: utilize the holographic bragg selectivity of body, repeat n time step 2, obtain n width of cloth volume hologram; The differential seat angle of described n=vortex light beam and reference beam/Δ θ;
Step 4: to write down the identical reference light R of i width of cloth volume hologram
iI width of cloth volume hologram record position in the incident volume holographic storage media obtains vortex light beam O
iReproduction;
Step 5: with the different vortex light beam O more than two width of cloth that obtain in the step 4
iCarry out coaxial stack and obtain combined vortex.
Described volume holographic storage media is transmission-type volume holographic storage media, reflective volume holographic storage media or proximal surface incident-type volume holographic storage media.
When volume holographic storage media is the transmission-type volume holographic storage media, angle theta described in step 1 or the step 2 and θ be 30 spend to 60 the degree.
When volume holographic storage media is proximal surface incident-type volume holographic storage media, angle theta described in step 1 or the step 2 and θ be 90 spend to 120 the degree.
When volume holographic storage media is reflective volume holographic storage media, angle theta described in step 1 or the step 2 and θ be 130 spend to 160 the degree.
A kind of device of realizing the production method of composite optical eddy is characterized in that comprising LASER Light Source 1, beam expander 2, first catoptron 3, second catoptron 4, main shutter 8, vortex modulator, volume holographic storage media 13, image acquisition device 14, a n reference path catoptron 5, a n beam splitter 6, a n reference path shutter 7, controller 15 and computing machine 16; The laser that LASER Light Source 1 sends under the control of main shutter 8, forms vortex light through the vortex modulator through beam expander 2, first catoptron 3 and second catoptron 4; Be provided with n beam splitter 6 between the light path of first catoptron 3 and second catoptron 4; Form n reference light; Behind n reference path shutter 7 of n reference light process, in volume holographic storage media 13, form n width of cloth volume hologram through n reference path catoptron 5 and vortex light; After volume holographic storage media 13 and with the coaxial image acquisition device 14 that is provided with of vortex light; Main shutter 8 realizes that with controller 15 and computing machine 16 electric signal connects with n reference path shutter 7.
Described vortex modulator adopts vortex plane holographic generator, spiral phase-plate vortex generator, mode switch vortex generator, hollow waveguide vortex generator or rotation minute surface optical parametric oscillator.
Described volume holographic storage media adopts transmission-type body holographic memory, reflective body holographic memory or proximal surface incident-type body holographic memory.
The laser that LASER Light Source 1 sends under the control of main shutter 8, forms vortex light through the vortex modulator through beam expander 2, first catoptron 3 and second catoptron 4; N beam splitter 6 between the light path of first catoptron 3 and second catoptron 4; Form n reference light; Behind n reference path shutter 7 of n reference light process, in volume holographic storage media 13, form n width of cloth volume hologram through n reference path catoptron 5 and vortex light.
Beneficial effect
The production method and the device thereof of the composite optical eddy that the present invention proposes; In volume holographic storage media, write the polyad holography through angular multiplexed mode; In the recording process; The vortex beam direction is constant all the time, has guaranteed the alignment of different vortex light beams, and the Bragg diffraction of volume holographic grating can make it to have very high diffraction efficiency.And the generation of composite optical eddy only needs to select for use corresponding reference light to reveal corresponding vortex light beam again to realize the stack of different optical vortex through computer control system.Whole production process is simple; Be prone to satisfy the alignment and the high-diffraction efficiency of different optical vortex; And because the method can increase the memory capacity of optical eddy through the incident angle that changes reference light; Therefore the production method of combined vortex of the present invention is simple and easy to regulate, and it is various to obtain the kind of combined vortex.
Description of drawings
Fig. 1: the process flow diagram that is the generation composite optical eddy method that proposes of the present invention
Fig. 2: be first kind of version utilizing the generation composite optical eddy of the inventive method design;
Among the figure, 1-LASER Light Source, 2-beam expander, 3-first catoptron, 4-second catoptron; 5-n reference path catoptron, 6-3 beam splitter, 7-3 reference path shutter, 8-master's shutter; The 9-Fourier transform lens, 10-inverse Fourier transform lens, 11-pinhole filter, 12-vortex plane holographic generator; 13-1-transmission-type volume holographic storage media, 14-image acquisition device, 15-controller, 16-computing machine.
Fig. 3 is that the topological charge that utilizes first kind of version to obtain is respectively 1,2,3 optical eddy stack result;
Among the figure; The topological charge of the a1-reconstruction of hologram is 1 optical eddy, and the topological charge of the a2-reconstruction of hologram is 2 optical eddy, and the topological charge of the a3-reconstruction of hologram is 2 optical eddy; The topological charge of the a4-reconstruction of hologram is the composite optical eddy of 1 and 2 coaxial stacks; The topological charge of the a5-reconstruction of hologram is the composite optical eddy of 2 and 3 coaxial stacks, and the topological charge of the a6-reconstruction of hologram is the composite optical eddy of 1 and 3 coaxial stacks, and the topological charge of the a7-reconstruction of hologram is the composite optical eddy of 1,2 and 3 coaxial stacks; The interference pattern of b1～b7-optical eddy or composite optical eddy and plane wave, A4～A7 and B4～B7-The corresponding results of numerical simulation.
Fig. 4 is second kind of version utilizing the generation composite optical eddy of the inventive method design;
Among the figure, 1-LASER Light Source, 2-beam expander, 3-first catoptron; 4-second catoptron, 5-n reference path catoptron, 6-5 beam splitter, 7-5 reference path shutter; 8-master's shutter, 18-spiral phase-plate vortex generator, 13-2-proximal surface incident-type volume holographic storage media; The 14-image acquisition device, 15-controller, 16-computing machine.
Fig. 5 is the third version of utilizing the generation composite optical eddy of the inventive method design;
Among the figure, 1-LASER Light Source, 2-beam expander, 3-first catoptron; 4-second catoptron, 5-n reference path catoptron, 6-5 beam splitter, 7-5 reference path shutter; 8-master's shutter, 19-mode switch vortex generator, the reflective volume holographic storage media of 13-3-; The 14-image acquisition device, 15-controller, 16-computing machine.
Embodiment
Combine embodiment, accompanying drawing that the present invention is further described at present:
Embodiment one:
See also Fig. 2; It is the main light channel structure of first embodiment of the production method of the composite optical eddy that proposes of the present invention; Comprise LASER Light Source 1; Be successively set on beam expander 2 on this LASER Light Source 1 emitting light path, first catoptron 3, beam splitter 6-1, by first reference path shutter 7-1 and the reference path catoptron 5-1 that are arranged on this beam splitter 6-1 reflected light path; Second reference path shutter 7-2 on beam splitter 6-2 on the beam splitter 6-1 transmitted light path and reflected light path and reference path catoptron 5-2; N reference path shutter 7-n on beam splitter 6-n reflected light path and reference path catoptron 5-n, second catoptron 4 on the transmitted light path of beam splitter 6-n, main shutter 8, vortex plane holographic generator 12, first Fourier transform lens 9, first pinhole filter 11, the first inverse Fourier transform lens 10.Reference path catoptron 5 towards being arranged to make reference light and the assigned address 17 of thing light intersect said n=3 at transmission-type hologram memory medium 13-1.
The structure that produces composite optical eddy also comprises controller 15 and the computing machine 16 that is used to control the shutter on reference light and the vortex light light path.
Other components and parts all adopt conventional products.
The storage means of this embodiment is: during record, the laser that LASER Light Source 1 sends provides system required directional light after beam expander 2.Directional light impinges perpendicularly on beam splitter 6-1, and incident light is divided into two-way: its reflected light through first reference path shutter 7-1 and reference path catoptron 5-1, constitutes the first required reference light R of record
1Its transmitted light impinges perpendicularly on beam splitter 6-2, is divided into two-way: its reflected light through second reference path shutter 7-2 and reference path catoptron 5-2, constitutes the second required reference light R of record
2Its transmitted light impinges perpendicularly on beam splitter 6-3, is divided into two-way: its reflected light through the 3rd reference path shutter 7-3 and reference path catoptron 5-3, constitutes the 3rd required reference light R of record
3Its transmitted light, behind second catoptron 4, main shutter 8 by 12 modulation of vortex plane holographic generator, first Fourier transform lens 9, first pinhole filter 11, the required vortex light of the first inverse Fourier transform lens, 10 records again.Vortex plane holographic generator 12, first Fourier transform lens 9, first pinhole filter 11, the first inverse Fourier transform lens 10, body holographic recording medium 13-1 constitute typical 4F structure.Each reference light is interfered the multiple grating of formation with vortex light with different angles incide transmission-type volume holographic storage media 13-1 from the same side same position 17, writes down a plurality of data pages.The process that reads is then with vortex light light path blocking-up, when being used to write down consistent reference light in the position 19 reading corresponding data page informations.
See also Fig. 3, it is optical eddy and a stack result thereof of utilizing present embodiment to obtain through experiment.It obtains step:
The first step: utilize first embodiment, with the first reference light R
1With topological charge be 1 optical eddy O
1 Same position 19 at volume holographic storage media 13-1 is interfered the formation grating;
Second step: using second reference light and topological charge is that 2 optical eddy is interfered the formation gratings at the same position 17 of volume holographic storage media 13-1;
The 3rd step: using the 3rd reference light and topological charge is that 3 optical eddy is interfered the formation gratings at the same position 17 of volume holographic storage media 13-1;
The 4th step: close vortex light light path, control the shutter release in the reference path, reveal corresponding optical eddy or composite optical eddy again, and gather with image acquisition device 14 through the controller 15 of computing machine 16 programmings.
Embodiment two:
See also Fig. 4; It is the main light channel structure of second embodiment of the production method of the composite optical eddy that proposes of the present invention; Comprise LASER Light Source 1; Be successively set on beam expander 2 on this LASER Light Source 1 emitting light path, first catoptron 3, beam splitter 6-1, by first reference path shutter 7-1 and the reference path catoptron 5-1 that are arranged on this beam splitter 6-1 reflected light path; Second reference path shutter 7-2 on beam splitter 6-2 on the beam splitter 6-1 transmitted light path and reflected light path and reference path catoptron 5-2; N reference path shutter 7-n on the reflected light path of beam splitter 6-n and reference path catoptron 5-n; Second catoptron 4 on the transmitted light path of beam splitter 6-n, main shutter 8, spiral phase-plate vortex generator 18; The one side of this proximal surface incident-type volume holographic storage media 13-2 and the reflected light path of reference path catoptron 5 are same as, said n=5.
The structure that produces composite optical eddy also comprises controller 15 and the computing machine 16 that is used to control the shutter on reference light and the vortex light light path.
The storage means of this embodiment is: during record, the laser that LASER Light Source 1 sends provides system required directional light after beam expander 2.Directional light impinges perpendicularly on beam splitter 6-1, and incident light is divided into two-way: its reflected light through first reference path shutter 7-1 and reference path catoptron 5-1, constitutes the first required reference light R of record
1Its transmitted light impinges perpendicularly on beam splitter 6-2, is divided into two-way: its reflected light through second reference path shutter 7-2 and reference path catoptron 5-2, constitutes the second required reference light R of record
2 Its transmitted light impinges perpendicularly on beam splitter 6-5, is divided into two-way: its reflected light through the 5th reference path shutter 7-5 and reference path catoptron 5-5, constitutes the 5th required reference light R of record
5Its transmitted light by 18 modulation of spiral phase-plate vortex generator, constitutes the required vortex light of record behind second catoptron 4, main shutter 8.Each reference light incides two adjacent surfaces of proximal surface incident-type volume holographic storage media 13-2 respectively and interferes therein with different angles with vortex light and forms multiple grating, writes down a plurality of data pages.The process that reads is then with vortex light light path blocking-up, when being used to write down consistent reference light in corresponding position the reading corresponding data page information.
Embodiment three:
See also Fig. 5; It is the main light channel structure of the 3rd embodiment of the production method of the composite optical eddy that proposes of the present invention; Comprise LASER Light Source 1; Be successively set on beam expander 2 on this LASER Light Source 1 emitting light path, first catoptron 3, beam splitter 6-1, by first reference path shutter 7-1 and the reference path catoptron 5-1 that are arranged on this beam splitter 6-1 reflected light path; Second reference path shutter 7-2 on beam splitter 6-2 on the beam splitter 6-1 transmitted light path and reflected light path and reference path catoptron 5-2; N reference path shutter 7-n on beam splitter 6-n reflected light path and reference path catoptron 5-n; Second catoptron 4 on beam splitter 6-n transmitted light path, main shutter 8, mode switch vortex generator 19; Reference path catoptron 5 towards the opposite face incident of being arranged to make reference light and vortex light at reflective volume holographic storage media 13-3; And in assigned address chiasma interference, said n=5.
The structure that produces composite optical eddy also comprises controller 15 and the computing machine 16 that is used to control the shutter on reference light and the vortex light light path.
The storage means of this embodiment is: during record, the laser that LASER Light Source 1 sends provides system required directional light after beam expander 2.Directional light impinges perpendicularly on beam splitter 6-1, and incident light is divided into two-way: its reflected light through first reference path shutter 7-1 and reference path catoptron 5-1, constitutes the first required reference light R of record
1Its transmitted light impinges perpendicularly on beam splitter 6-2, is divided into two-way: its reflected light through second reference path shutter 7-2 and reference path catoptron 5-2, constitutes the second required reference light R of record
2 Its transmitted light impinges perpendicularly on beam splitter 6-5, is divided into two-way: its reflected light through the 5th reference path shutter 7-5 and reference path catoptron 5-5, constitutes the 5th required reference light R of record
5Its transmitted light by 19 modulation of mode switch vortex generator, constitutes the required vortex light of record behind second catoptron 4, main shutter 8.Each reference light incides the opposite face of reflective volume holographic storage media 13-3 with vortex light respectively with different angles, and interferes the multiple grating of formation therein, writes down a plurality of data pages.The process that reads is then with vortex light light path blocking-up, when being used to write down consistent reference light in corresponding position the reading corresponding data page information.
The invention is not restricted to above-mentioned embodiment.
For example, in above-mentioned embodiment, as an example, used a kind of optical eddy generation device and a kind of body holographic memory mode to combine.But multiple optical eddy generation device is arranged, and polytype volume holographic storage media is so long as wherein arbitrary combination can be used.Under the sort of situation, be to be understood that the structure of body hologram memory system entire portion needs suitably to revise.
Claims (8)
1. the production method of a composite optical eddy is characterized in that step is following:
Step 1: the light of laser emitting is divided into two bundle coherent lights, wherein a branch of vortex modulation formation vortex light beam O that carries out
1Vortex light beam O
1With another bundle reference light R
1Incide with an angle and to obtain first width of cloth interference solid hologram in the volume holographic storage media;
Step 2: with reference light R
1Deflection angle Δ θ becomes new reference light R
2, with vortex light beam O
1Carry out the vortex modulation and form new vortex light beam O
2, reference light R
2With vortex light beam O
2Interfere another volume hologram of formation with the same position of new angle in volume holographic storage media, accomplish second width of cloth recording of information; Said deflection angle Δ θ be 0.02 spend to 0.06 the degree;
Step 3: utilize the holographic bragg selectivity of body, repeat n time step 2, obtain n width of cloth volume hologram; The differential seat angle of described n=vortex light beam and reference beam/Δ θ;
Step 4: to write down the identical reference light R of i width of cloth volume hologram
iI width of cloth volume hologram record position in the incident volume holographic storage media obtains vortex light beam O
iReproduction;
Step 5: with the different vortex light beam O more than two width of cloth that obtain in the step 4
iCarry out coaxial stack and obtain combined vortex.
2. the production method of composite optical eddy according to claim 1, it is characterized in that: described volume holographic storage media is transmission-type volume holographic storage media, reflective volume holographic storage media or proximal surface incident-type volume holographic storage media.
3. the production method of composite optical eddy according to claim 1 and 2 is characterized in that: when volume holographic storage media was the transmission-type volume holographic storage media, the angle described in step 1 or the step 2 was 30 to spend to 60 degree.
4. the production method of composite optical eddy according to claim 1 and 2 is characterized in that: when volume holographic storage media was proximal surface incident-type volume holographic storage media, the angle described in step 1 or the step 2 was 90 to spend to 120 degree.
5. the production method of composite optical eddy according to claim 1 and 2 is characterized in that: when volume holographic storage media was reflective volume holographic storage media, the angle described in step 1 or the step 2 was 130 to spend to 160 degree.
6. a device of realizing the production method of the described composite optical eddy of claim 1～5 is characterized in that comprising LASER Light Source (1), beam expander (2), first catoptron (3), second catoptron (4), main shutter (8), vortex modulator, volume holographic storage media (13), image acquisition device (14), a n reference path catoptron (5), a n beam splitter (6), a n reference path shutter (7), controller (15) and computing machine (16); The laser that LASER Light Source (1) sends under the control of main shutter (8), forms vortex light through the vortex modulator through beam expander (2), first catoptron (3) and second catoptron (4); Be provided with n beam splitter (6) between the light path of first catoptron (3) and second catoptron (4); Form n reference light; Behind n reference light n the reference path shutter of process (7), in volume holographic storage media (13), form n width of cloth volume hologram through n reference path catoptron (5) and vortex light; Volume holographic storage media (13) afterwards and with the coaxial image acquisition device (14) that is provided with of vortex light; Main shutter (8) and n reference path shutter (7) realize that with controller (15) and computing machine (16) electric signal connects.
7. device according to claim 6 is characterized in that: described vortex modulator adopts vortex plane holographic generator, spiral phase-plate vortex generator, mode switch vortex generator, hollow waveguide vortex generator or rotation minute surface optical parametric oscillator.
8. device according to claim 6 is characterized in that: described volume holographic storage media adopts transmission-type body holographic memory, reflective body holographic memory or proximal surface incident-type body holographic memory.
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| CN102944312B (en) * | 2012-11-23 | 2015-05-27 | 苏州大学 | Method for measuring partially coherent vortex light beam topological charge number |
| CN105988261B (en) * | 2016-07-18 | 2019-01-04 | 深圳大学 | A kind of vortex light field generation device |
| CN106990547B (en) * | 2017-05-16 | 2021-08-13 | 南开大学 | Dolphin-shaped cellular circle array super surface |
| CN109143593B (en) * | 2018-08-17 | 2020-12-25 | 南京邮电大学 | Vortex light preparation device based on Fourier holographic principle |
| CN113534473B (en) * | 2021-06-23 | 2022-08-30 | 吉林大学 | Vortex light array system |
| CN113433690B (en) * | 2021-06-25 | 2022-11-29 | 北京理工大学 | Optical device for generating vortex light beam based on conversion material and design method |
| CN115494650B (en) * | 2022-11-07 | 2023-03-21 | 中国航天三江集团有限公司 | Composite light beam synthesizing method and system |
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