CN1385764A - Optical storage method utilizing light variation image - Google Patents
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Abstract
There is an optical storage method taking advantage of light-changing graph, its characters lies in that it incldues steps as follows: (1) it changes stored information into graph, word or data list with given coding mode; (2) according to the characters of light-changing graph, it arranges the graph and word list in step (1) into light-changing graph and word. Hereinto, so called light-changing graph is made up of grating unit array, each grating unit is made of elaborate graph, word or data bit and the scale of grating unit is no more than 160 micron; (3) it storages the light-changing graph acquired from step (2) to recording material by light-changing graph copy-arrangement system. Technical scheme of the invention realizes high information-density light-changing's stored light-carving of the random digital graph and word.
Description
Technical field
The present invention relates to a kind of storage means, be specifically related to a kind of optical storage method that utilizes light variation image to realize.
Background technology
So-called optical memory, its Main physical implication be, in very little storage medium space, utilizes the optical characteristics of storage medium, record and preserve a large amount of and information that can read on storage medium.The main method of existing optical memory is to pass through the method for Fourier (Fourier) conversion on volume material, input picture or literal are placed the front focal plane of fourier lense, on back focal plane, the Fourier transform figure that interferes the record input picture, in very little volume type recording materials (selling off cubic crystal), carry out the high information density storage as light.Chinese invention patent application CN1274915A discloses a kind of fixed three-dimensional photon memory, comprise writing system and read-out system, adopt photorefractive crystal as three-dimensional storage medium, write fashionable, by computing machine storage file is encoded, form coded graphics, and by spatial light modulator generation coded image or memory image, utilize green (light) laser as writing light source, laser sends after beam splitter is divided into two bundle light from laser instrument, and wherein a branch of light is through filtering, behind the collimation, be modulated into information needed light by spatial light modulator, another Shu Guang is as reference light, and two-beam is interfered formation record grating in photorefractive crystal; When reading, as reading light source, read light and behind slit and phase mismatch adjuster, incide on the photorefractive crystal, receive diffracted light image information, by computer decoding and be reduced into computer documents by CCD with red light semiconductor laser.This method memory capacity is proportional to the three cubed inverse of recording wavelength, and storage density can reach 10 in theory
13Bits/cm
3But, its two-beam after beam splitting, thing light provides the information input, reference light provides with reference to interference effect, thereby there is a following shortcoming: 1, thing light intensity variations scope is very big, be difficult to obtain uniform thing reference record at posting field, the effect of nonlinear of record is big, and 2, nonoverlapping zone at two-beam, reference light still exposes to recording materials, increase background noise, thereby this method is when carrying out the high density storage, the signal to noise ratio (S/N ratio) of memory image will significantly descend along with the increase of memory image, be difficult to obtain the higher high s/n ratio storage density that has in the practice.Aforementioned patent has increased read-out system for this reason, read light source by the red light semiconductor laser conduct different with writing light inlet, though can improve signal to noise ratio (S/N ratio) to a certain extent like this, do not tackle the problem at its root, simultaneously read-out system is provided with complexity and the volume that has increased system.On the other hand, because the restriction of recording method and material behavior, the set time of each width of cloth image storage is very long, and canned data is difficult to duplicate, and does not also far reach the practical stage.
Light variation image (Optical Variable Device) has extraordinary application on security, CD, novel package false proof, be one of present high-level anti-counterfeiting technology means.The characteristics of light variation image are made up of small random grating matrix, different with the ordinary numbers image, each random grating of forming light variation image, be actually the optical parametric difference, orientation is different, the meticulous diffraction grating (gratings) that the fringe spacing is different, when white light light incides on these meticulous gratings, direction behind the diffraction of each unit grating pair light, color has nothing in common with each other, the light Xing of different qualities is mapped to the different azimuth in space, the group of the random grating of identical characteristics, constitute specific figure, thereby under different viewing angles, present the different graphic effect, thereby light variation image has the variable effect of space optics.
The optical parametric of describing Optical Variable Imaging has: and the position (X, Y), the diffraction direction of random grating (angle), the clause density distribution (color) of random grating and the luminous efficient (brightness) of pixel.With the motion of work light or the variation of observed bearing, the color of light variation image, shape all can change.Broadly, describe light variation image and have more physical parameter than describing common 2D image, therefore, light variation image is an image format more widely, not only can show the 2D image with it, simultaneously also 2d/3d can be described, stereogram picture, animated image, coding encrypting image, changing image or the like.
Fig. 1 is typical light variation image, and when observing this image at diverse location, actual image will present convergent-divergent (a), rotation (b) changes, and can regard the multichannel bitmap images on the space as.Light variation image is appreciated that into the image that obtains after the digitized processing of rainbow hologram in one aspect, but different with rainbow hologram, and light variation image is not subjected to the restriction of light source condition, can observe under any light source condition.
Usually, describe light variation image meticulous raster unit be shaped as circle, picture structure is a lattice structure, Fig. 2 is the partial enlarged drawing to light variation image, each circular point is by miniature optical grating constitution, the orientation and the fringe spacing of grating have nothing in common with each other, and the variation of the dot structure of this light variation image complexity often is used to false proof field.But the image information that this light variation image is expressed on macroscopic view, the carrying capacity of information is limited, does not carry the function of large information capacity.
Summary of the invention
The object of the invention provides a kind of highdensity optical storage method, its storage signal to noise ratio (S/N ratio) height, and can duplicate with conventional method.
For achieving the above object, the technical solution used in the present invention is: a kind of optical storage method that utilizes light variation image comprises the following steps:
(1) coded system that the canned data utilization is set generates figure, literal or data sequence;
(2) according to the characteristic of light variation image, become light to become picture and text the picture and text series arrangement that generates in the step (1), wherein, described light variation image is made of the raster unit array, each raster unit is to be made of meticulous figure, literal or data bit, and the yardstick of raster unit is not more than 160 microns;
(3) light that obtains in the step (2) being become picture and text utilizes the light variation image photo-composing system to store on the recording materials.
In the technique scheme, light variation image is that the array by small raster unit constitutes, constitute with the raster unit of former cause circle and different to be, in this programme, on each raster unit, also modulation has meticulous figure, literal or data bit like this, and each physical grating unit of light variation image all is to be made of meticulous figure or literal or data bit, and change also can be adjusted in grating orientation and fringe spacing on each unit.
Light variation image photo-composing system wherein can utilize existing light variation image photo-composing system to realize, certainly, because in this programme, each grating inside, unit also has meticulous figure or literal, thereby, to the also corresponding raising of the requirement of light variation image photo-composing system, a kind of photo-composing system of light variation image preferably can be, comprise laser instrument, optoelectronic switch, beam expander, spatial light modulator and beam splitting element, the laser beam that laser instrument produces is by behind the optoelectronic switch, project on the spatial light modulator through the beam expander collimation, the light change graph text information of desire storage machine as calculated exports on the spatial light modulator, light beam is after spatial modulation, by an optical imaging system with the spatial modulation image projection to beam splitting element, beam splitting element is beamed into two bundle light with laser beam, by optical imaging system two-beam is converged on the recording materials again, two-beam is interfered mutually, form meticulous interference fringe, the scope at the interval of interference fringe is the 0.5-2 micron, after treatment, acquisition has the unit spot of optical grating construction, beam splitting element is placed on the precise rotating platform, the rotation of turntable will change the orientation of interference fringe on recording materials, by computer software control recording materials platform, spatial light modulator and turntable and optoelectronic switch, thus the optics that forms the high density light variation image on recording materials stores.
Here, spatial light modulator (SLM) is to carry out a spatial amplitude (intensity) or a device of modulating mutually to light beam, and it can be by computing machine input and display image.The minimum pixel unit of spatial light modulator should guarantee to form sharply defined image on final raster unit.The pixel cell that this method requires is that the SLM of 5-100 micron all can be used for the spatial modulation device.Here, SLM can be relevant/incoherent light spatial modulator or DMD (Digital Micro-mechanical MirrorDevice, digitizing micro-reflector spare) or LCD (Liquid Crystal Device, LCD) and other entering apparatus of being used for computing machine input.
Optical imaging system before the beam splitting is a kind of optical system that the modulation signal (optical imagery) of spatial light modulator output can be dwindled, the minification of this optical system is 1-15 times, and beam diameter should guarantee to incide the homogeneity of the light field on the spatial light modulator.Optical imaging system after beam splitting element, precise rotating platform and the beam splitting has constituted the light beam beam splitting jointly, has closed beam system, on recording materials, formation is by the precise image that carries interference fringe or the literal of the image of spatial light modulator input, here, beam splitting element mainly refers to defraction grating device, it mainly is diffracted into the energy of light on the positive and negative one-level light, and interference fringe is formed by positive and negative one-level interference of light.
In the technique scheme, described picture and text sequence can be a figure, can be literal, can be data bit, also can be their combination, by setting information specific coding expression way, represents canned data with figure, literal or data bit.When described picture and text sequence adopts figure, can be the figure sequence with the particular arrangement expressing information of a plurality of figures, its graphic element comprises circle, square, cruciform etc.; Described picture and text sequence also can be word sequence, can store one or more literal in each raster unit; Described picture and text sequence can also be for by 0 and 1 data bit sequence of forming, and each data bit is represented with light and shade in raster unit, contains continuous a plurality of data bit in each raster unit.
In the technique scheme, for strengthening anti-counterfeiting performance, described light becomes picture and text and is made of positive and negative film, by changing the grating space of unit grating, obtains the positive and negative light variation image of inlaying on same recording materials.Wherein said positive is meant bright background, dark word, and negative film is meant dark background, bright word.
In the technique scheme, for further improving information storage density, can use multiplexing memory technology, promptly when storage light becomes picture and text, at the unit grating, change the orientation of grating and the fringe spacing of grating, obtain the light variation image of various visual angles, can significantly improve the storage density of information with this, such as, can be on main perspective memory image, other literal of storage or image on other visual angle.
In the technique scheme, described recording materials can be the amplitude type photosensitive materials; It also can be relief type position phase photosensitive material, for relief type position phase photosensitive material, interference fringe spatially is that embossment distributes, through aftertreatment, can on metal material, form the relief type striped, this metallograph can be used for impressing out this embossment striped on pressure sensitive, thereby can duplicate canned data easily; If the employing high-power laser beam, then recording materials can also be plastics or metal material, utilize the light variation image of the etching acquisition record of laser beam.
Canned data of the present invention detects easier, owing to can observe image easily under common white light, for the picture and text storage, is being higher than under 30 times the optical microscope, can the direct reading canned data; For the data bit storage, can utilize the combination of optical means and computing machine easily, realize that the reading of storage data is handled.
Because the utilization of technique scheme, the present invention compared with prior art has following advantage as a kind of optical storage method:
1. be easy to duplicate.Technical scheme of the present invention has realized that the light of the high information density of Any Digit picture and text becomes the storage photoetching, here the optical memory that refers to mainly is the 2D storage on the recording materials of plane, it is a kind of plane recording mode, the optical memory of light variation image and literal mainly writes down on the relief type recording materials, therefore, the light variation image and the literal of storage have possessed good replication capacity, can be widely used in suitability for industrialized production under the various copy conditions, as industries such as printing, packing, optical disc production, bronzing material, false proof and diffractive optical elements.
2. information storage density height.Because the area of recording materials is bigger, therefore, if represent a data bit (bit) with " 1 " and " 0 ", the canned data capacity of this method is near A/ λ
2, here, A is the area of storage, the recording wavelength when λ is storage.The light variation image unit is by different optical grating constitutions, on each raster unit, in the modulation meticulous image or literal or data bit, like this, each physical grating unit of light variation image all is to be made of meticulous figure or literal or data bit, and change also can be adjusted in grating orientation and fringe spacing on each unit, thereby, one than the zonule in, as at 10 * 10mm
2In, to consider angular multiplexedly, this storage means is easy to reach 10
7Bit/cm
2Such optical memory density can be stored up to 4,000～16 as only using single channel (a grating orientation), 000 or the literal and the small image of greater number, when adopting hyperchannel, can also significantly improve memory space, thereby this method has very high information carrying capacity.
3. signal to noise ratio (S/N ratio) is good.For the unit grating, the fringe spacing of the interference fringe that produces on final image or literal is: d=λ/(sin θ
O-sin θ
R), in the formula, d is the interference fringe interval, λ is a laser beam wavelength, θ
O, θ
RBe respectively the angle of two light beams and recording materials plane normal, work as θ
R=-θ
O=θ/2 o'clock, following formula become symmetry and interfere d==λ/2sin (θ/2).As shown in Figure 4, that is to say, participate in the thing light of coherent interference and reference light except the normal of the angle of incident and recording materials symmetrically, other characteristic is identical, interference region is overlapped fully, and therefore, the signal to noise ratio (S/N ratio) of the image of storage is fine, certainly, final storage quality will be decided by the precision of optical characteristics, recording materials characteristic and the intelligent control system of the quality of SLM, the picture element of imaging system (diffraction limited characteristic), beam splitting element.
4. antifalsification is good.The inventive method canned data, not easy-to-use other method is forged, compare with common some array holographic, image in the some array holographic is made up of dot matrix, character stroke is discontinuous, and in the storage means of the present invention, under the observation condition that can differentiate, literal is a continuous stroke, rather than is made up of dot matrix; The orientation of the interference fringe that the present invention forms in each unit spot can be different, and the light that makes the storage back form becomes the variation of picture and text along with viewing angle, and image has dynamic sense on macroscopic view, this be with other with holograph and miniature photoetching different feature; Simultaneously, image, figure or the literal of input appointment on can the optional position in light variation image; Zones of different in the same light variation image can form the picture and text point of different units spot size, promptly forms a view picture light variation image by the picture and text point of different resolution; Unit literal or image can also be negative or positive, and these all are that other method is difficult to accomplish.
Description of drawings
Accompanying drawing 1 is the light variation image synoptic diagram of background technology;
Accompanying drawing 3 is the structural representation of light variation image photo-composing system in the embodiment of the invention one;
Accompanying drawing 4 is that interfering beam and normal direction concern synoptic diagram among the embodiment one;
Accompanying drawing 5 is a synoptic diagram of using the microscopic examination light variation image among the embodiment one;
Accompanying drawing 6 is to the part synoptic diagram of accompanying drawing 10 for light variation image storage among the present invention;
Accompanying drawing 11 is the synoptic diagram of positive and negative storage among the present invention.
Wherein: [1], laser instrument; [2], optoelectronic switch; [3], beam expander; [4], spatial light modulator; [5], optical imaging system; [6], beam splitting element; [7], optical imaging system; [8], recording materials; [9], turntable; [10], recording materials platform.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: to shown in the accompanying drawing 5, a kind of optical storage method that utilizes light variation image comprises the following steps: referring to accompanying drawing 3
(1) coded system that the canned data utilization is set generates figure, literal or data sequence;
(2) according to the characteristic of light variation image, become light to become picture and text the picture and text series arrangement that generates in the step (1), wherein, described light variation image is made of the raster unit array, each raster unit is to be made of meticulous figure, literal or data bit, and the yardstick of raster unit is not more than 160 microns;
(3) light that obtains in the step (2) being become picture and text utilizes the light variation image photo-composing system to store on the recording materials.
Wherein, described light variation image photo-composing system comprises laser instrument 1, optoelectronic switch 2, beam expander 3, spatial light modulator 4 and beam splitting element 6, the laser beam that laser instrument 1 produces is by behind the optoelectronic switch 2, project on the spatial light modulator 4 through beam expander 3 collimations, the light change graph text information of desire storage machine as calculated exports on the spatial light modulator 4, light beam is after spatial modulation, by an optical imaging system 5 with the spatial modulation image projection to beam splitting element 6, beam splitting element 6 is beamed into two bundle light with laser beam, by optical imaging system 7 two-beam is converged on the recording materials 8 again, two-beam is interfered mutually, form meticulous interference fringe, beam splitting element 6 is placed on the precise rotating platform 9, the rotation of turntable 9 will change the orientation of interference fringe on recording materials 8, by computer software control recording materials platform 10, spatial light modulator 4 and turntable 9 and optoelectronic switch 2, thus the optics that forms the high density light variation image on recording materials 8 stores.
Being higher than under 30 times the optical microscope, can read canned data, certainly, and the raising of microscopical enlargement ratio, the reading that helps to store picture and text is referring to Fig. 5.
Light becomes the method for picture and text optics storage, is a kind of graphical design and manufacture method of effective high information quantity, for example, and at 10 * 10mm
2Within, use this method, only in the single channel image, just can store literal up to the 4000-16000 byte.To by mould pressing technology canned data be made in by on the anti-counterfeiting object by the various features of anti-counterfeiting object and the storage of related content record, can play good anti-fake effect.Thereby the method that this light becomes the optics storage of picture and text is the important method and the technological means of high-level optical anti-counterfeiting, for example at ID card, passport, banknote, credit card and various authentication text.See Fig. 6-8.
Compare with the common language microphotography, the optics memory method of light change picture and text not only has the miniature characteristics of common language microphotography, has more the optical signature of self:
The picture and text of optics storage contain the grating micro-structure, and fineness reaches the 0.5-2 micron.
It spatially is optically-variable that the light of optics storage becomes picture and text, and the picture and text of observing on the different viewing angles can be different.
On same position, can store several picture and text by optics, and under different viewing angles, observe.Like this, this method can support the optics of large information capacity to store.
The optics storage that light becomes picture and text is that pointwise (unit) stores, and is not area (volume storage), and picture and text have good signal to noise ratio (S/N ratio).
The stroke of the literal of storage is continuous.Rather than dot matrix.
Embodiment two: the light variation image storage that obtains as the method for embodiment one, each unit spot that storage type light is become picture and text is arranged by certain rule, simultaneously, interference fringe orientation, unit spot picture structure or shape are made up, storage type light becomes picture and text and has had encoding function and information encryption function, sees accompanying drawing 7-8.The technology (as DatMatix, PDF417, MAXCode etc.) that is used for the 2D coding all can be applied in light and become in the storage, will encode to combine with light change storage.Here, the memory encoding that light becomes picture and text has more coding parameter (position, x, y, grating orientation and grating clause interval), therefore, has encoding process ability more flexibly.
The inserted light of embodiment four become picture and text and are stored in application on gold stamping, the wrappage
For laser image on gold stamping, usually, gold stamping area is less, if on gold stamping image literal is arranged, so, the size of literal is more than 0.5mm.This method utilizes inserted light to become the big characteristics of information capacity that picture and text store, and the meticulous light of storage becomes picture and text on the local location of laser image, such as the size of literal less than 0.16mm.See Figure 10.Thereby, in very little area, (, can check as the important information of storing commodity of 2mm * 2mm).
Equally, the storage-type light variation image is a kind of anti-counterfeiting packing material of extraordinary detection type.In the part of wrappage, store the information of relevant product, can be used for concealed-enciphering, be convenient to detect and examination.The striking features that this storage-type anti-counterfeit package is used is, because the area of storage is little, the design of storage does not influence the global design of original packing, simultaneously, big information capacity, write down commodity and manufacturing information and technical information effectively, be convenient to checking, whole laser production processes gold stamping or wrappage do not need to change.
The positive and negative embedding technique of embodiment five light variation images
As shown in Figure 11, have high alignment precision because light becomes the storage of picture and text, can store the positive and negative literal of inlaying on same position, the grating space of positive negative image is different, also is different thereby inlay the color of literal under light.Even can store different images in same position.It can be positive (bright background, dark word) or negative film (bright word, dark background) that this light becomes picture and text, also can be that light change picture and text are positive and negative alternate.
Embodiment six multi-channel informations are encrypted and are carried
Deposit multiplexing memory technology (angular multiplexed and wavelength multiplexing promptly changes the orientation of grating and the clause interval of grating) if utilize multichannel light to become picture and text, can increase substantially the information memory capacity on unit area.Information density can reach 1 * 10
7Bit/cm
2, the corner of change divided beam system is stored accordingly, and the storage density in the storage area is multiplied.Such as, memory image on main perspective, other literal or image of storage on other angles, thereby, on than small size, can store a large amount of information, simultaneously, canned data under the non-main perspective is difficult for being observed under common viewing angle, and the encryption that can be used for big information is carried.See shown in Figure 11.If adopt the body storage medium, canned data density also will increase.
Claims (10)
1. an optical storage method that utilizes light variation image is characterized in that, comprises the following steps:
(1) coded system that the canned data utilization is set generates figure, literal or data sequence;
(2) according to the characteristic of light variation image, become light to become picture and text the picture and text series arrangement that generates in the step (1), wherein, described light variation image is made of the raster unit array, each raster unit is to be made of meticulous figure, literal or data bit, and the yardstick of raster unit is not more than 160 microns;
(3) light that obtains in the step (2) being become picture and text utilizes the light variation image photo-composing system to store on the recording materials.
2. optical storage method as claimed in claim 1, it is characterized in that: described light variation image photo-composing system comprises laser instrument [1], optoelectronic switch [2], beam expander [3], spatial light modulator [4] and beam splitting element [6], the laser beam that laser instrument [1] produces is by behind the optoelectronic switch [2], project on the spatial light modulator [4] through beam expander [3] collimation, the light change graph text information of desire storage machine as calculated exports on the spatial light modulator [4], light beam is after spatial modulation, by an optical imaging system [5] with the spatial modulation image projection to beam splitting element [6], beam splitting element [6] is beamed into two bundle light with laser beam, by optical imaging system [7] two-beam is converged on the recording materials [8] again, two-beam is interfered mutually, form meticulous interference fringe, beam splitting element [6] is placed on the precise rotating platform [9], the rotation of turntable [9] will change the orientation of interference fringe on recording materials [8], by computer software control recording materials platform [10], spatial light modulator [4] and turntable [9] and optoelectronic switch [2] store thereby go up the optics that forms the high density light variation image at recording materials [8].
3. optical storage method as claimed in claim 1 is characterized in that: described picture and text sequence is the figure sequence with the particular arrangement expressing information of a plurality of figures, and its graphic element comprises circle, square, cruciform etc.
4. optical storage method as claimed in claim 1 is characterized in that: described picture and text sequence is a word sequence, can store one or more literal in each raster unit.
5. optical storage method as claimed in claim 1 is characterized in that: described picture and text sequence is that each data bit is represented with light and shade in raster unit, contains continuous a plurality of data bit in each raster unit by 0 and 1 data bit sequence of forming.
6. optical storage method as claimed in claim 1 is characterized in that: described light becomes picture and text and is made of positive and negative film, by changing the grating space of unit grating, obtains the positive and negative light variation image of inlaying on same recording materials.
7. optical storage method as claimed in claim 1 is characterized in that: use multiplexing memory technology, promptly when storage light becomes picture and text, at the unit grating, change the orientation of grating and the fringe spacing of grating, obtain the light variation image of various visual angles.
8. optical storage method as claimed in claim 1 or 2 is characterized in that: described recording materials are amplitude type photosensitive materials.
9. optical storage method as claimed in claim 1 or 2 is characterized in that: described recording materials are relief type position phase photosensitive materials, can utilize the light variation image of stamping technique duplicated record.
10. optical storage method as claimed in claim 1 or 2 is characterized in that: described recording materials are plastics or metal material, and described laser beam is a high-power laser beam, utilize the light variation image of the etching acquisition record of laser beam.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842606A (en) * | 2017-04-06 | 2017-06-13 | 苏州苏大维格光电科技股份有限公司 | A kind of optical diffraction device and preparation method thereof and three-dimensional display apparatus |
| CN109230744A (en) * | 2017-07-10 | 2019-01-18 | 深圳市力群印务有限公司 | The method that the useless film of thermoprint carries out secondary thermoprint |
| CN111427248A (en) * | 2020-04-01 | 2020-07-17 | 南京大学 | Multichannel orbital angular momentum multiplexing nonlinear holographic device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842606A (en) * | 2017-04-06 | 2017-06-13 | 苏州苏大维格光电科技股份有限公司 | A kind of optical diffraction device and preparation method thereof and three-dimensional display apparatus |
| WO2018184375A1 (en) * | 2017-04-06 | 2018-10-11 | 苏州苏大维格光电科技股份有限公司 | Light diffraction device, preparation method therefor, and 3d display apparatus |
| CN106842606B (en) * | 2017-04-06 | 2019-04-05 | 苏州苏大维格光电科技股份有限公司 | A kind of optical diffraction device and preparation method thereof and three-dimensional display apparatus |
| CN109230744A (en) * | 2017-07-10 | 2019-01-18 | 深圳市力群印务有限公司 | The method that the useless film of thermoprint carries out secondary thermoprint |
| CN111427248A (en) * | 2020-04-01 | 2020-07-17 | 南京大学 | Multichannel orbital angular momentum multiplexing nonlinear holographic device |
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