CN101529509A - Setup and methods for storing data in and reading out data from a holographic storage arrangement - Google Patents
Setup and methods for storing data in and reading out data from a holographic storage arrangement Download PDFInfo
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H1/0252—Laminate comprising a hologram layer
- G03H1/0256—Laminate comprising a hologram layer having specific functional layer
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
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- G—PHYSICS
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H2001/2625—Nature of the sub-holograms
- G03H2001/264—One hologram being a HOE
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- G—PHYSICS
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2223/00—Optical components
- G03H2223/20—Birefringent optical element, e.g. wave plate
Abstract
A setup for storing data in and reading out data from a holographic storage medium comprises a light source (12) for emitting light (14) having a wavelength lambda, a modulator (16) for modulating the light emitted by the light source, projection means (18) for forming a signal beam (20) from the modulated light and for focusing the signal beam into the holographic storage medium (26) and a light source (12) for emitting a reference beam (22, 32) into the holographic storage medium, the reference beam having a wavelength lambda. The setup comprises a grating (28) and lambda/4-layer (30) arranged such that the incident reference beam (22, 32) is diffracted by the grating, upon which the diffracted beam (34) again travels through the lambda/4-layer.
Description
Technical field
The present invention relates to be used for data storage to hologram memory medium and from hologram memory medium the equipment (setup) and the method for sense data.
Background technology
In holographic data storage, two dimensional spatial light modulator (SLM) pattern that will comprise numerical information (" 0 " and " 1 ") projects on the hologram memory medium.Modal configuration is so-called 4f Fourier configuration, and wherein the distance between the SLM and first lens is a focal distance f of these lens
1, the distance from these lens to medium is f
1, the distance from medium to second lens is a focal distance f of these second lens
2, and the distance from these second lens to detector array is f once more at last
2Typically, f
1=f
2
Provided a diagram of this equipment among Fig. 4.Light by LASER Light Source (not shown, by Reference numeral 112 expressions) emission is split into two light beams.First light beam 114 is directed to reflective spatial light modulator 116 by means of polarization beam apparatus 136, for example the LCoS device.Second light beam is as reference beam 122.The 2-D data page or leaf that is produced by reflective spatial light modulator 116 (R-SLM) is reflected towards imaging len 118, and described imaging len 118 focuses the light in the hologram memory medium 126.The light that focuses on the hologram memory medium 126 from lens 118 is called signal beams 120.Hologram memory medium 126 is the part of holographic memory device (arrangement) 110, this holographic memory device shown in simple scenario under comprise two protective seams 138,140, hologram memory medium 126 is clipped between these two protective seams.In order to carry out record, signal beams 120 interferes with reference beam 122, and this causes the modulation of the refractive index in the hologram memory medium 126.The data of this modulation representative storage.Between reading duration, only with the described medium of reference beam 122 irradiation, originally this cause the reconstruction of the data page wavefront that carried by signal beams 120 by means of the scattering in the hologram memory medium 126.Utilize lens 144 that the light beam 142 of scattering is imaged onto on the detector array 124, described detector array is CMOS or ccd array for example.From the distance of R-SLM 116 to first lens 118 corresponding to the focal length of these lens 118 and equal from lens 118 to hologram memory medium 126 distance.In addition, the distance that equals to mention at first from the distance and the distance of hologram memory medium 126 to second lens 144 from second lens 114 to detector array 124; The 4f that hence obtains one's name configuration.
A shortage that known problem is a compactedness that disposes shown in Fig. 4, the big optical device because on the both sides of hologram memory medium 126, there be loose (bulky).Known improvement of the prior art be the excute phase conjugation read (referring to for example Ken Anderson et al., High speedholographic data storage at 100Gbit/in
2, Tech.Digest ISOM/ODS 2005).By using phase conjugation, utilize the phase conjugation of the reference beam that uses during the record to finish described reading, i.e. reference beam during the reference beam backpropagation data storage between reading duration.
Provided the diagram of this equipment among Fig. 5.Although the record stage has been used reference beam 122 with described similar with reference to Fig. 4, the stage of reading is different.When reading, utilize the reference beam 132 irradiation holographic medias of backpropagation.The light beam of the scattering that obtains advances to and scioptics 118.Polarization beam apparatus 136 projects detector array 124 with the light beam of this scattering, be that this detector array 124 and spatial light modulator 116, polarization beam apparatus 136, condenser lens 118 and light source 112 place the same side of holographic memory device 110 with being provided with of Fig. 4 forms contrast.Yet, although the total system according to Fig. 5 is compacter more than the system according to Fig. 4 really, but some optical device still need to be in " opposite side " of holographic memory device, because the reference beam that need when the opposite side projection of holographic memory device is read, use, and for example for plane (in-plain) is angular multiplexed, need handle it.
Therefore, be desirable to provide a kind of compact more system.
Summary of the invention
According to one aspect of the present invention, provide be used for data storage to hologram memory medium and from hologram memory medium the equipment of sense data, described equipment comprises
Light source, it is used to launch the light with wavelength X,
Modulator, it is used to modulate light by described light emitted so that form signal beams,
Projection mechanism (means), it is used for signal beams is focused on hologram memory medium,
Light source, it is used for reference beam is transmitted into hologram memory medium, and this reference beam has wavelength X,
Wherein said equipment comprises grating and λ/4 layer, and it is configured such that the incident reference beam by optical grating diffraction, in case diffraction takes place, the light beam of this diffraction passes described λ/4 layer once more.
By adopting suitable grating, can use the index modulation that interferes and produce by the reference beam of this optical grating diffraction so that with signal beams in the hologram memory medium, perhaps read the data of before having stored owing to the interference of incident reference beam and signal beams.Because grating, whole optical device places the same side of hologram memory medium, and this is being useful especially aspect compactedness of described equipment.
According to an embodiment, grating constant is λ/2sin θ, and θ is the nominal incident angle of incident reference beam.Under the situation of reference beam, utilize this grating, this reference beam of single order diffraction light backpropagation with angle θ incident.
According to another embodiment, the incident angle θ ' of reference beam is variable with respect to the nominal incident angle θ of reference beam.On this basis, make the angular multiplexed possibility that becomes, this permission is stored more information in the equal volume of hologram memory medium into.
Realize that multiplexing a kind of possibility is, for the different incidence angles θ ' of the reference beam of memory period, grating constant is λ/2sin θ, and the reference beam of the diffraction during the incident reference beam between reading duration and the record is aimed at.Therefore, even utilize the grating of the phase conjugation be designed to produce all reference beams that given reference beam rather than memory period use, the present invention can by make need backpropagation on meaning of the present invention beam alignment realize.
According to another embodiment, for the different incidence angles θ ' of the reference beam of memory period, grating constant is λ/2sin θ, and the incident reference beam during the reference beam of the diffraction between reading duration and the record is aimed at.
According to another embodiment, described grating be suitable between reading duration be diffraction and writing down during be substantial transparent.At memory period, because not existing of grating do not produce the reference beam of diffraction, and between reading duration, the reference beam of diffraction can be used for from holographic media storer reading of data.As what explained in detailed description, this allows to improve the packing density in the described holographic media.
In this, described grating can have photochromic characteristic.
In addition, possible is, the element that selectivity is transparent is arranged between projection mechanism and the grating, and described equipment comprises makes the transparent element of this selectivity opaque basically mechanism in substantial transparent between reading duration and during writing down.
One aspect of the present invention also relates to the light that is used for according to having a wavelength X and stores the holographic memory device of data, and this holographic memory device comprises λ/4 layer between hologram memory medium, grating and hologram memory medium and the grating.
Especially, described holographic memory device can form the single unit system that comprises described hologram memory medium, grating and λ/4 layer.
According to an embodiment, described holographic memory device can use with the reference beam that is produced by certain equipment, this equipment be used for data storage to holographic memory device and from holographic memory device sense data, described reference beam has nominal incident angle θ, and described grating has grating constant λ/2sin θ.
One aspect of the present invention also relates to the method for data storage in the holographic memory device, and described method comprises step:
The light that emission has wavelength X,
Modulate this light so that form signal beams,
Holographic memory device is provided, and this holographic memory device comprises λ/4 layer between hologram memory medium, grating and hologram memory medium and the grating,
Signal beams is focused in the holographic memory device,
Reference beam is transmitted in the holographic memory device, and this reference beam has wavelength X,
Wherein by optical grating diffraction, in case diffraction takes place, the light beam of this diffraction passes λ/4 layer and passes hologram memory medium the incident reference beam once more after passing hologram memory medium and passing λ/4 layer, and
Wherein the interference of light beam by described diffraction and described signal beams with data storage in hologram memory medium.
On this basis, can provide the method for sense data from holographic memory device, wherein the method comprising the steps of:
Reference beam is transmitted in the holographic memory device, and this reference beam has wavelength X,
Hologram memory medium is left in this reference beam scattering, and
Detect the reference beam of this scattering,
The reference beam that wherein uses between reading duration is aimed at the reference beam of the diffraction that memory period uses.
Therefore, during the record stage, used the backpropagation character of the light beam of diffraction, and during the stage of reading, only carried out conventional reading according to the incident reference beam.
According to another embodiment, the present invention relates to the method for data storage in the holographic memory device, described method comprises step:
The light that emission has wavelength X,
Modulate this light so that form signal beams,
Holographic memory device is provided, and this holographic memory device comprises λ/4 layer between hologram memory medium, grating and hologram memory medium and the grating,
Signal beams is focused in the holographic memory device,
Reference beam is transmitted in the holographic memory device, and this reference beam has wavelength X,
Wherein the interference by this incident reference beam and described signal beams with data storage in hologram memory medium.
In this, proposed the method for sense data from holographic memory device, wherein the method comprising the steps of:
Reference beam is transmitted in the holographic memory device, and this reference beam has wavelength X,
Wherein by optical grating diffraction, in case diffraction takes place, the light beam of this diffraction passes λ/4 layer and passes hologram memory medium the incident reference beam once more after passing hologram memory medium and passing λ/4 layer,
Hologram memory medium is left in the reference beam scattering of this diffraction, and
Detect the reference beam of this scattering,
The incident reference beam that uses during the reference beam of the diffraction that wherein uses between reading duration and the record is aimed at.
Therefore, although described record is that the interference by incident reference beam and signal beams realizes on the basis of routine, described reading based on the incident reference beam that uses during the reference beam of diffraction and the record aimed at.
About last-mentioned embodiment, described grating can between reading duration be diffraction and writing down during be substantial transparent.
In addition, possible is, the element that selectivity is transparent is arranged between holographic recording medium and the grating, and the transparent element of this selectivity is in substantial transparent between reading duration and opaque basically during writing down.
These and other aspects of the present invention will be well-known according to embodiment described below, and set forth with reference to these embodiment.
Description of drawings
Fig. 1 show according to one embodiment of the invention be used for data storage to hologram memory medium and from hologram memory medium the equipment of sense data.
Fig. 2 shows the holographic memory device according to one embodiment of the invention.
Fig. 3 shows and is used for the multiplexing holographic memory device of graphic extension Plane Angle.
Fig. 4 show according to prior art be used for data storage to holographic memory device and from holographic memory device the equipment of sense data.
Fig. 5 show according to prior art be used for data storage to holographic memory device and from holographic memory device the another kind of equipment of sense data.
Embodiment
Fig. 1 show according to of the present invention be used for data storage to hologram memory medium and from hologram memory medium the equipment of sense data.The situation of record has been shown in the part of Fig. 1 (a).Polarized light 14 projects in the polarization beam apparatus 36 from light source (not shown, still by Reference numeral 12 expressions).Relevant polarisation of light direction is shown little arrow or is fixed on the circle at the starting point place of bigger arrow, and it indicates direction of light.Light reflexes to spatial light modulator 16 by polarization beam apparatus 36.Spatial light modulator 16 reflects light to opposite direction.This light can comprise two different polarizations, and its representative " 0 " and " 1 " promptly will be sent to the data of hologram memory medium 26.This light is propagated by λ/2 layers 48 and lens 18, so that rotatory polarization and project in the holographic memory device 10 with the form of signal beams 20.Except spatial light modulator 16, detector array 24 is arranged perpendicular to spatial light modulator 16, and it will be used between reading duration.
In the embodiment in figure 1, holographic memory device 10 comprise hologram memory medium 26, grating 28 and be clipped in hologram memory medium 26 and grating 28 between λ/4 layers 30.Hologram memory medium 26 is covered by protective seam 50.Should be pointed out that hologram memory medium 26 can separate with grating 28 and λ/4 layers 30.In other words, holographic media 26 can be inserted in the equipment that comprises grating 28 and λ/4 layers 30 by the user.For this purpose, this equipment also will comprise the mechanism that is used to hold described holographic media 26.This holding mechanism can have and is applicable to described holographic media is arranged on Any shape between lens 18 and λ/4 layers 30, for example pallet that (for example in the CD Player) used in the Chang Gui optical memory.
Except signal beams 20, reference beam 22 is projected in the holographic memory device 10.This reference beam 22 has wavelength X and can be produced by the light source identical with signal beams 20 12, is perhaps produced by different light sources.Therefore, the light source that is used to produce the light source of signal beams 20 and is used to produce reference beam 22 can be same light source.Because the suitable selection of grating constant, reference beam 22 is diffracted into certain angle, the feasible reference beam 34 backpropagation incident reference beams 22 of diffraction in the embodiment shown in fig. 1 of this angle.By the interference of incoming signal light beam 20, in hologram memory medium 26, form hologram pattern, for example the space index modulation with the reference beam 34 of diffraction.In fact, because λ/4 layers 30, the reference beam 34 of diffraction has the polarization identical with signal beams 20, and thereby can interfere with signal beams 20.
In the part of Fig. 1 (b) situation of reading has been shown.Between reading duration, only reference beam 32 is projected in the holographic memory device 10.In this embodiment, reference beam 32 is phase conjugations of the reference beam 34 of the diffraction that uses during the record.Therefore, hologram (hologram) is left in reference beam 32 scatterings, scioptics 18, λ/2 layers 48, beam splitter 36 and arrive detector array 24.
Fig. 2 shows the holographic memory device according to one embodiment of the invention.The backpropagation of the reference beam 34 of incident reference beam 22 and diffraction here, has been described in detail in detail.The situation of this backpropagation can realize that this moment, θ was the nominal incident angle of holographic media internal reference light beam 22 by grating constant being chosen as λ/2sin θ.So, the light beam 34 backpropagation incident reference beams 22 of single order diffraction.
Fig. 3 shows and is used for the multiplexing holographic memory device of graphic extension Plane Angle.In holographic data storage, realize multiplexing so that more information is stored in the identical volume.This is sequentially to write multipage by the incident angle that changes reference beam to finish the most commonly.Step-length according to for example 0.1 degree increases incident angle, so that write down different data pages.For example, can change incident angle around certain nominal incident angle, described nominal incident angle is the mean value of possible incident angle.For example, can change incident angle between 40 degree and 60 degree, the nominal incident angle is 50 degree in this case.Yet if grating is designed to have grating constant λ/2sin θ and θ is the nominal incident angle, so only for this nominal incident angle, grating just can be definitely with the direction of optical diffraction to backpropagation.For other angle, as shown in Figure 3, the light of diffraction will be with different angle outgoing.The part of Fig. 3 (a) shows wherein incident angle less than the situation of nominal incident angle θ, and the part of Fig. 3 (b) shows the incident angle greater than nominal incident angle θ.Yet, according to embodiments of the invention, correct record and read and remain possible.This can be by writing down and read out realization under the different angles of reference beam.In record shown in Figure 1 and the situation that reads, for specific page or leaf, the incident direction of reading the reference beam in the stage is mated with the direction of light of the diffraction of record in the stage.For the incident angle of the reference beam that uses during the record, wherein this incident angle is different with the angle of the definite backpropagation of the light beam that at it grating is designed to obtain diffraction, and the incident direction of reading the reference beam in the stage is different with the direction of the incident reference beam of record in the stage.In this way, all pages or leaves all are read out, and do not lose fidelity.Typically, grating will be designed to have the spacing (pitch) with Nominal angle θ coupling, and described angle is the angle of the centre of the angular range that reaches of reference beam.
In situation described above, grating all exists between record and reading duration.This may have following shortcoming: during writing down, the reference beam of incident and diffraction is all propagated by photosensitive holographic media, and has only one to be used to store data and reading of data subsequently in these two light beams.Under situation shown in Figure 1, the information of having only the incident beam 34 by diffraction to write between reading duration is read by incident reference beam 32.Therefore, the dynamic range of photo-polymeric holographic material may be by the existence consumption of two light beams, thereby cause lower memory capacity.In order to address this problem, considered another embodiment.According to this another embodiment, be not that the reference beam of diffraction is used for data recording, but incident reference beam and signal beams are interfered so that write data in the hologram memory medium.So the incident reference beam that the reference beam backpropagation of sense data by diffraction is used to write down is realized.According to this another embodiment, can avoid reduction owing to the memory capacity that the existence of two reference beams causes in the holographic media 26 during the record.Can promptly only exist and not exist so that but grating is a switch in the record stage in the stage of reading.Only when reading, open grating, and the incident reference beam at first diffraction leave this grating, volume hologram is left in scattering subsequently, so that construct signal on detecting device.This for example can realize by the grating with photochromic characteristic.Under a wavelength, the optical reflection of photochromatic layer and absorption can be controlled by the amount of bump light thereon under another wavelength.Also can use grating with electrochromic property.
In first embodiment, under " closing " state, grating be substantial transparent and do not have diffraction to take place.During the stage of reading, by wavelength is coupled to and encourages this grating (" opening " state) on the grating with being used to read the data on the hologram and writing data into the different light source of wavelength on the hologram.This is the non-contact method that is used for switchable holographic figure between " writing " and " reading " state.
Replacedly, in a second embodiment, but but non-switch grating be hidden in after switch mirror or the absorber.This for example can be photochromic or EC mirror.In such an embodiment, can with the characteristic of switch efficient of optimization grating irrespectively, allow to realize the bigger optical contrast between " opening " and " closing " state.
Without departing from the scope of the invention, there are not the equivalent and the modification of description above can adopting yet, described scope limits in appended claims.Any Reference numeral in following claims should not be regarded as the restriction to claim.Should be clearly, verb " comprises " and the use of variant is not got rid of and had other any elements that do not limit in any claim.Word " one " or " one 's " use is not got rid of and is had a plurality of such elements before the element.
Claims (17)
- One kind be used for data storage to hologram memory medium (26) and from hologram memory medium (26) equipment of sense data, described equipment comprisesLight source (12), it is used to launch the light (14) with wavelength X,Modulator (16), it is used to modulate light by described light emitted so that form signal beams,Projection mechanism (18), it is used for this signal beams is focused on hologram memory medium (26),Light source (12), it is used for reference beam (22,32) is transmitted in the described hologram memory medium, and this reference beam has wavelength X,Wherein said equipment comprises grating (28) and λ/4 layer (30), and it is configured such that incident reference beam (22,32) by described optical grating diffraction, in case diffraction takes place, the light beam of this diffraction (34) passes described λ/4 layer once more.
- 2. according to the equipment of claim 1, wherein said grating has grating constant λ/2sin θ, and θ is the nominal incident angle of described incident reference beam.
- 3. according to the equipment of claim 2, the incident angle θ ' of wherein said reference beam is variable with respect to the nominal incident angle θ of this reference beam.
- 4. according to the equipment of claim 3, wherein for the different incidence angles θ ' of the reference beam (22) of memory period, grating constant is λ/2sin θ, and described equipment is configured such that the reference beam of diffraction during incident reference beam and the record between reading duration aims at.
- 5. according to the equipment of claim 3, wherein for the different incidence angles θ ' of the reference beam (22) of memory period, grating constant is λ/2sin θ, and the incident reference beam during the described equipment reference beam that is configured such that the diffraction between reading duration and the record is aimed at.
- 6. according to the equipment of claim 1, wherein said grating (28) be suitable between reading duration be diffraction and writing down during be substantial transparent.
- 7. according to the equipment of claim 6, wherein said grating (28) has photochromic characteristic.
- 8. according to the equipment of claim 1, wherein also that selectivity is transparent element is arranged between described projection mechanism and the described grating, and described equipment comprises makes the transparent element of this selectivity opaque basically mechanism in substantial transparent between reading duration and during writing down.
- 9. one kind is used for storing the holographic memory device (10) of data according to the light with wavelength X, and this holographic memory device comprises λ/4 layer (30) between hologram memory medium (26), grating (28) and described hologram memory medium and the described grating.
- 10. according to the holographic memory device (10) of claim 9, wherein said holographic memory device forms the single unit system that comprises described hologram memory medium (26), grating (28) and λ/4 layer (30).
- 11. holographic memory device (10) according to claim 9, wherein said holographic memory device (10) can use with the reference beam that is produced by certain equipment, this equipment be used for data storage to holographic memory device and from holographic memory device sense data, described reference beam has nominal incident angle θ, and described grating has grating constant λ/2sin θ.
- 12. one kind with the method for data storage in the holographic memory device, described method comprises step:The light (14) that emission has wavelength X,Modulate this light so that form signal beams,Holographic memory device (10) is provided, and this holographic memory device comprises λ/4 layer (30) between hologram memory medium (26), grating (28) and described hologram memory medium and the described grating,Described signal beams is focused in the described holographic memory device,Reference beam (22) is transmitted in the described holographic memory device, and this reference beam has wavelength X,Wherein said incident reference beam after passing described hologram memory medium and passing described λ/4 layer by described optical grating diffraction, in case generation diffraction, the reference beam of this diffraction (34) passes described λ/4 layer once more and passes described hologram memory medium, andWherein the interference of the reference beam (34) by described diffraction and described signal beams (20) with data storage in described hologram memory medium.
- 13. the method for a sense data from holographic memory device, described data are recorded by the method according to claim 12, and described method comprises step:Reference beam is transmitted in the described holographic memory device, and this reference beam has wavelength X and the reference beam (34) of the diffraction that uses with memory period is aimed at,Described hologram memory medium is left in this reference beam (32) scattering, andDetect the reference beam of this scattering.
- 14. one kind with the method for data storage in the holographic memory device, described method comprises step:The light that emission has wavelength X,Modulate this light so that form signal beams,Holographic memory device is provided, and this holographic memory device comprises λ/4 layer between hologram memory medium, grating and described hologram memory medium and the grating,Described signal beams is focused in the described holographic memory device,Reference beam is transmitted in the described holographic memory device, and this reference beam has wavelength X,Wherein the interference by this incident reference beam and described signal beams with data storage in described hologram memory medium.
- 15. the method for a sense data from holographic memory device, described data are recorded by the method according to claim 14, and described method comprises step:Reference beam is transmitted in the described holographic memory device, and this reference beam has wavelength X,Wherein said incident reference beam after passing described hologram memory medium and passing described λ/4 layer by described optical grating diffraction, in case generation diffraction, the light beam of this diffraction passes described λ/4 layer once more and passes described hologram memory medium, the incident reference beam that uses during the reference beam of this diffraction and the record is aimed atDescribed hologram memory medium is left in the reference beam scattering of this diffraction, andDetect the reference beam of this scattering.
- 16. according to the method for claim 14 and 15, wherein said grating between reading duration be diffraction and writing down during be substantial transparent.
- 17. according to the method for claim 14 and 15, wherein that selectivity is transparent element is arranged between described holographic recording medium and the described grating, the transparent element of this selectivity is in substantial transparent between reading duration and opaque basically during writing down.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06301052.4 | 2006-10-16 | ||
| EP06301052 | 2006-10-16 |
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| CN101529509A true CN101529509A (en) | 2009-09-09 |
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| CNA2007800385407A Pending CN101529509A (en) | 2006-10-16 | 2007-10-12 | Setup and methods for storing data in and reading out data from a holographic storage arrangement |
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| EP (1) | EP2074616A2 (en) |
| JP (1) | JP2010507183A (en) |
| KR (1) | KR20090082214A (en) |
| CN (1) | CN101529509A (en) |
| TW (1) | TW200837518A (en) |
| WO (1) | WO2008047282A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346424A (en) * | 2010-07-30 | 2012-02-08 | 张树森 | Dynamic reproduction method for grating encrypted message |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5222524B2 (en) * | 2007-10-19 | 2013-06-26 | 株式会社日立製作所 | Optical information recording medium, optical information recording / reproducing apparatus, and optical information recording / reproducing method |
| EP2286408A2 (en) * | 2008-05-14 | 2011-02-23 | Dublin Institute of Technology | A holographic recording method, a holographic recording medium and use of such medium |
| DE102010064383B4 (en) * | 2010-12-22 | 2015-10-29 | Seereal Technologies S.A. | Light modulator device |
| RU2456684C1 (en) * | 2011-02-24 | 2012-07-20 | Евгений Петрович Гребенников | Method to read recorded optical information from multi-layer carrier with photosensitive medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6909684B2 (en) * | 2001-03-22 | 2005-06-21 | Fuji Xerox Co., Ltd. | Optical recording medium, holographic recording and/or retrieval method and holographic recording and/or retrieval apparatus |
| US6721076B2 (en) | 2001-08-03 | 2004-04-13 | Inphase Technologies, Inc. | System and method for reflective holographic storage with associated multiplexing techniques |
| EP1708044B1 (en) * | 2003-12-10 | 2010-12-08 | Nippon Telegraph And Telephone Corporation | Production method of a laminated holographic medium and an authentication sheet production method. |
| JP4631439B2 (en) * | 2005-01-06 | 2011-02-16 | ソニー株式会社 | Hologram recording / reproducing apparatus and hologram recording / reproducing method |
-
2007
- 2007-10-12 WO PCT/IB2007/054157 patent/WO2008047282A2/en active Application Filing
- 2007-10-12 TW TW096138410A patent/TW200837518A/en unknown
- 2007-10-12 CN CNA2007800385407A patent/CN101529509A/en active Pending
- 2007-10-12 JP JP2009532931A patent/JP2010507183A/en active Pending
- 2007-10-12 EP EP07826722A patent/EP2074616A2/en not_active Withdrawn
- 2007-10-12 KR KR1020097009769A patent/KR20090082214A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346424A (en) * | 2010-07-30 | 2012-02-08 | 张树森 | Dynamic reproduction method for grating encrypted message |
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| Publication number | Publication date |
|---|---|
| WO2008047282A3 (en) | 2008-07-24 |
| TW200837518A (en) | 2008-09-16 |
| EP2074616A2 (en) | 2009-07-01 |
| WO2008047282A2 (en) | 2008-04-24 |
| KR20090082214A (en) | 2009-07-29 |
| JP2010507183A (en) | 2010-03-04 |
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