WO2001086659A1 - Procede et dispositif pour lire des informations stockees holographiquement - Google Patents

Procede et dispositif pour lire des informations stockees holographiquement Download PDF

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Publication number
WO2001086659A1
WO2001086659A1 PCT/EP2001/005301 EP0105301W WO0186659A1 WO 2001086659 A1 WO2001086659 A1 WO 2001086659A1 EP 0105301 W EP0105301 W EP 0105301W WO 0186659 A1 WO0186659 A1 WO 0186659A1
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WO
WIPO (PCT)
Prior art keywords
storage medium
information
modulator
reading
fields
Prior art date
Application number
PCT/EP2001/005301
Other languages
German (de)
English (en)
Inventor
Ag Optostor
Theo Woike
Mirco Imlau
Original Assignee
Ag Optostor
Theo Woike
Mirco Imlau
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ag Optostor, Theo Woike, Mirco Imlau filed Critical Ag Optostor
Priority to AU2001256345A priority Critical patent/AU2001256345A1/en
Publication of WO2001086659A1 publication Critical patent/WO2001086659A1/fr

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Classifications

    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/042—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using information stored in the form of interference pattern

Definitions

  • the invention relates to a method for reading out information holographically stored in a storage medium and stored in at least two different spatial areas of the storage medium, in which an information beam containing the holographic information is generated in the storage medium with the aid of a reading beam, and at which the information beam is recorded with the aid of recording means for recording the information.
  • the invention also relates to a device for carrying out the method with a radiation source for generating a reading beam directed at the storage medium from coherent electromagnetic radiation and with recording means for detecting the information beam generated in the storage medium.
  • a liquid crystal display illuminated by a write beam with a resolution of, for example, 1024 * 1024 pixels, that is 10 e bits, is used as the image source.
  • the data bit pattern thus generated is then holographically written into the storage medium in a predetermined spatial area at a predetermined angle using a reference beam which is coherent with the write beam.
  • Holographic data and image memories thus open up completely new possibilities.
  • the storage and reading of data by holographic means takes place in parallel, since a complete image or a complete bit pattern can be stored holographically and then read or recorded as often as desired.
  • Acquisition of the information is understood to mean the recording and processing of the optical information contained in the information beam.
  • the detection can include a conversion of the optical information into electrical signals, for example with the aid of a CCD camera, as well as a purely optical further treatment.
  • An array of optical fibers enables, for example, an optical transmission of the information of the individual points of the bit pattern, which will be used in the future Application of optical computers enables a high parallel processing of the information.
  • Storing and reading out holographic information in the storage medium in at least two different spatial areas is referred to as location multiplexing.
  • the volume of the storage medium if it exceeds a minimum size, is used several times for the storage of holograms.
  • volumes of a few cubic millimeters are sufficient, so that a plurality of different spatial areas in a storage medium can be separately written with holograms.
  • angular multiplexing By rotating the holographic storage medium via a preferably motorized and controllable turntable, information can also be holographically written in and read out from different angles in a spatial region of the storage medium. This is called angular multiplexing.
  • angular multiplexing In particular for reading out, it must be ensured that the angle of incidence of the reading beam exactly meets the Bragg condition of the hologram to be read out.
  • the Bragg condition also defines the angle of reflection of the information beam, so that the optical axes of the reading beam and of the information beam are precisely specified and the angular position of the storage medium can be adjusted for the purpose of angular multiplexing.
  • the same amount of data can be written into the same spatial area of the holographic storage medium, so that angular multiplexing in an angular area of +/- 50 0 approx. 10,000 holograms with a data volume of 10 6 bits each can be written.
  • location multiplexing can be used to use various location positions on the holographic storage medium at which the holograms can be stored.
  • the total capacity of a holographic storage medium can thus be estimated as follows:
  • holographically written data can be used non-destructively with regard to further light irradiation, e.g. during the readout process, as well as being environmentally friendly for a long period of time.
  • any holographic material can also be used as the storage medium.
  • the storage medium can consist of a crystal or of a plurality of partial crystals connected to form a unit.
  • the storage medium can also be made from an organic or inorganic photorefractive medium, i.e. from materials that change their refractive index or their absorption coefficient through light irradiation.
  • the holographic material of the storage medium is suitable for holographically storing information.
  • the readout speed of individual holograms is very high due to the simultaneous acquisition of an entire image or data bit pattern because of the high parallelism of the acquisition.
  • the positioning of the reading beam by mechanical means is very time-consuming.
  • a holographic read-only memory (ROM) must be readable quickly. Therefore, the holographic storage medium should not only be able to be quickly rotated to the required angular position, but in order to read out the information, the reading beam must be able to be positioned as instantly as possible on the various spatial areas of the storage medium.
  • a predetermined angle of incidence on the storage medium must be observed in order to exactly meet the Bragg condition at a given angular position of the storage medium. In the prior art, this can be done with mechanically adjustable optics or with an optoacoustic deflection device cannot be accomplished reliably and sufficiently quickly.
  • the present invention is therefore based on the technical problem of creating a method and a device by means of which various holographically described spatial areas of a holographic storage medium can be quickly and easily detected with a reading beam while maintaining the angle of incidence.
  • the technical problem outlined above is solved by a method according to claim 1 in that the storage medium is detected in a spatially limited manner with the aid of a spatial beam modulator arranged in the beam path.
  • a spatial beam modulator arranged in the beam path.
  • the beam modulator is optionally arranged in front of or behind the storage medium in the beam path.
  • the spatial beam modulator is arranged in the beam path of the reading beam and at least one field of the beam modulator is controlled in such a way that the field directs the part of the reading beam that strikes it onto the storage medium as a partial reading beam.
  • the other fields of the beam modulator are controlled in such a way that they do not direct the reading beam striking them onto the storage medium.
  • the reading beam is either directed in the direction of the storage medium or completely blocked or directed into areas outside the storage medium, depending on the control.
  • the spatial beam modulator can be arranged in the beam path of the information beam, at least one field of the beam modulator being controlled in such a way that the part of the information beam striking the field is directed onto the recording means as a partial information beam.
  • the other fields of the beam modulator are controlled in such a way that the part of the information beam that strikes the other fields is not directed to the recording means.
  • it is not the reading beam but the information beam that contains the information from the entire illuminated area of the storage medium that is hidden. This is selected with the aid of the beam modulator in such a way that only that part of the information beam which contains the information of the desired spatial area of the storage medium is directed onto the recording means.
  • the beam modulator preferably has a plurality of fields, each of which can be controlled electrically, which are arranged in particular in the form of a matrix.
  • the fields can be controlled individually or in groups.
  • the beam modulator can thus also be referred to as a selector which, from the expanded reading beam or information beam, only selects the area which is required for the acquisition of the information.
  • the invention is therefore characterized in that the change in location of the partial read beam or the partial information beam can be carried out very quickly by a purely electrical control of the beam modulator.
  • the beam geometry of the various processed partial rays with respect to the respective Bragg condition of the information written in is retained for all spatial areas of the holographic storage medium.
  • the partial beams or partial information beams that are produced all run parallel to one another and all meet the predetermined Bragg angular condition. Due to the suitable arrangement of the optical elements of the recording means, all information written in different locations of the holographic storage medium can thus be recorded.
  • Mechanical adjustment of optical elements for reading out different spatial areas of the storage medium for the same angular conditions is thus effectively avoided. There is also no need to readjust the partial rays with respect to the specified angular relationship.
  • electrically controllable beam modulators are characterized by low wear in long-term use.
  • the technical problem outlined above is solved by a device for reading out information holographically stored in a storage medium in accordance with claim 5 in that a spatial beam modulator is arranged in the beam path.
  • the beam modulator partially suppresses the incident beam, where can be read out separately by specifically different spatial areas within the storage medium.
  • the beam modulator is optionally arranged in the beam path of the reading beam in front of the storage medium or in the beam path of the information beam behind the storage medium. This affects either the reading beam or the information beam.
  • the beam modulator preferably has a surface which essentially corresponds to the size of the surface of the storage medium. This ensures that the expanded reading beam, which essentially completely illuminates the beam modulator, can reach the entire volume of the storage medium in the form of masked partial beams. Since the widened reading beam essentially represents a bundle of rays running in parallel, the activation of the individual fields of the beam modulator makes it possible to illuminate separate spatial areas of the storage medium without requiring additional optics. The partial beam blended out by the beam modulator therefore strikes the storage medium as a parallel beam at the preset angle. It also applies that the surface of the beam modulator covers the entire cross-sectional area of the information beam, so that individual sections or beam bundles can be masked out from its entire cross-section.
  • the size of the surface of the beam modulator can deviate from that of the storage medium, in particular be made smaller.
  • the surface of the beam modulator can then be optically imaged onto the storage medium using suitable optics.
  • the optics used preferably have two converging lenses which are arranged in such a way that their focal points coincide.
  • the parallel beam of rays incident from the beam modulator is thus imaged in a parallel beam of different dimensions, which is then directed, for example, at the storage medium.
  • the beam modulator is designed to be reflective, for example in the form of a digital mirror device.
  • a digital mirror device This consists of a matrix of mirrors with small dimensions, which are arranged essentially in one plane and can be individually adjusted in their angular position by electrical control.
  • piezoelectric elements are provided for the electrical adjustment, which separately adjust each individual mirror of the digital mirror device.
  • one or more mirrors of the mirror matrix can be set so that only the part of the reading or information beam that is irradiated onto them is directed at the storage medium or the recording means, while the other mirrors have a different spatial direction and the electromagnetic radiation impinging on them reflect into a space outside the storage medium or the recording means.
  • each mirror of the digital mirror device corresponds to one of the electrically controllable fields described above.
  • the beam modulator is designed to be transmitting, for example in the form of a liquid crystal display (LCD).
  • LCD liquid crystal display
  • each of the picture elements of the liquid crystal display these can either be transmissive or block the reading or information beam.
  • Each picture element or group of picture elements of the liquid crystal display thus corresponds to an electrically controllable field of the type generally described above.
  • the electrically controllable fields can be controlled individually or in groups, so that, depending on the spatial area of the storage medium to be read out, any partial beam from the expanded reading beam striking the beam modulator or any partial information beam from the incident information beam are masked out can.
  • FIG. 1 shows a first exemplary embodiment of a device according to the invention for reading out holographically stored information in a schematic illustration
  • Fig. 2 shows the embodiment shown in Fig. 1 in a schematic perspective view.
  • 3 shows a second exemplary embodiment of a device according to the invention in a schematic illustration,
  • Fig. 4 shows the embodiment shown in Fig. 3 in a schematic perspective view
  • Fig. 5 shows a third embodiment of a device according to the invention in a schematic representation.
  • a laser 1 generates a laser beam which passes through a polarizer 2 and a beam expander 3 with spatial frequency filtering by means of an aperture arranged in the focus of a first converging lens.
  • the widened laser beam is reflected as a reading beam 5 on the spatial beam modulator 6, which works in reflection and is designed as a digital mirror device.
  • the expanded reading beam 5 is selected on the surface of the beam modulator 6 according to size and location, and the partial reading beam 7 generated in this way falls on the holographic storage medium 8 in order to read out certain holograms.
  • the different holograms are stored in the holographic storage medium 8 in different spatial areas and at different angles relative to the incident partial beam 7.
  • the partial beam 7 is divided into an information beam 10 containing the information, diffracted under the Bragg angle, and a transmitted partial beam 11.
  • the information beam 10 diffracted from the hologram is expanded by means of an optical system 12, the expanded beam 13 essentially completely illuminating a CCD camera 14.
  • the CCD camera converts the projected hologram into electrical signals, which are then available for further processing.
  • the optics 12 are designed such that the deflected information beam 10 is imaged onto the CCD camera 14 from all spatial areas of the storage medium 8.
  • the holographic storage medium 8 is also rotatably arranged on a turntable 9, so that the angular multiplexing can be carried out for a selected area.
  • the turntable 9 is equipped with the rotary encoder and can be controlled.
  • the reflection of the expanded laser beam 5 on the reflecting beam modulator 6 is shown in perspective.
  • the expanded reading beam 5 illuminates the beam modulator 6 essentially completely and preferably with a substantially homogeneous intensity.
  • the beam modulator 6 reflects only a partial beam 7, the position of the partial beam 7 with respect to the storage medium 8 and the diameter of the partial beam 7 being set as a function of the space 18 in the storage medium 8 which is occupied by the holographic information written in.
  • one or more fields 21 of the beam modulator 6 can be switched in order to reflect the partial beam 7 in the direction of the storage medium 8.
  • This is exemplarily shown as a reflecting window, which consists of a total of four fields 21, as shown by dashed lines in Fig. 2.
  • the cross-sectional area of the partial beam 7 is adapted to the area of the storage medium 8 to be irradiated.
  • the other reflecting fields 20 are controlled in such a way that they reflect the reading beam 7 in a direction other than in the direction of the storage medium. For the sake of clarity, this is not shown in FIG. 2.
  • the partial read beam 7 strikes the holographic storage medium 8 and reads out the hologram stored in the spatial region 18 at the set angle between the partial read beam 7 and the storage medium 8.
  • the diffracted information beam 10 and the transmitted partial beam 11 result, which - as shown in FIG. 1 for the rest - is expanded into the beam 13 via the optics 12 and imaged in the CCD camera 14.
  • the data of the CCD camera 14 are taken over by a computer and further processed there.
  • Fig. 3 shows a second embodiment of the present invention, wherein the same reference numerals designate the same elements as in the first embodiment.
  • a laser 1 generates a laser beam, which passes through a polarizer 2 and a beam expander 3 with spatial frequency filtering, is reflected as a reading beam 5 on a mirror 4 and then transmits a beam modulator 15.
  • the spatial beam modulator 15 is designed as a liquid crystal display (LCD).
  • the expanded reading beam 5 is selected according to size and location and falls as partial beam 7 onto the high lographic storage medium 8 in order to read out a hologram stored there in a predetermined spatial area.
  • the partial beam 7 is divided into a refracted information beam 10 containing the information and a transmitted partial beam 11.
  • the information beam 10 diffracted from the hologram is expanded by means of an optical system 12, the expanded beam 13 essentially completely illuminating the CCD camera 14.
  • the optics 12 are designed such that the deflected beam 10 is imaged onto the CCD camera 14 from all locations of the storage medium 8.
  • the passage of the expanded reading beam 5 through the transmitting beam modulator 15 is shown in perspective in FIG. 4.
  • the widened reading beam 5 illuminates the beam modulator 15 completely and preferably with an essentially homogeneous intensity. Due to the electrical peeling, only a partial beam 7 transmits the beam modulator 15, the position of the partial beam 7 in relation to the holographic storage medium 8 and the diameter of the partial beam 7 being set as a function of the space in the storage medium 8 occupied by the holographic information written in.
  • one or more fields 17 of the beam modulator 15 can be switched to allow the partial beam 7 to pass.
  • the exemplary opened window which consists of a total of four fields 17, as shown with broken lines in FIG. 4, allows the partial beam 7 to pass.
  • the partial read beam 7 strikes the holographic storage medium 8 and reads out the hologram stored in the spatial region 18 at the set angle between the partial read beam 7 and the storage medium 8.
  • the diffracted information beam 10 and the transmitted partial beam 11 result.
  • the information beam 10 is expanded into the beam 13 via the optics 12 and imaged in the CCD camera 14.
  • the data of the CCD camera 14 are taken over by a computer and further processed there.
  • the space requirement in the first exemplary embodiment is less than in the second exemplary embodiment, since the beam modulator 6 of the first exemplary embodiment takes on the function of the mirror 2 in the second exemplary embodiment. Therefore, no further optical element is required in the beam path between the reflecting beam modulator 6 and the storage medium 8, so that the two assemblies can be arranged closer to one another.
  • a reflective beam modulator has the advantage that the intensity of the partial beam 7 is considerably greater in comparison with the intensity attenuated by the absorption within the liquid crystal display 15 in the second exemplary embodiment.
  • FIG. 5 shows a third exemplary embodiment of the present invention, with the same reference numerals identifying the same elements as in the previously described exemplary embodiments.
  • a laser 1 generates a reading beam, which passes through a polarizer 2 and a beam expander 3 with spatial frequency filtering, is reflected as a reading beam 5 on a mirror 4 and strikes the holographic storage medium 8. There, the information contained in all spatial areas of the storage medium 8 is read out at the predetermined angle.
  • the reading beam 5 is divided into a refracted information beam 10 containing the information and a transmitted partial beam 11.
  • the information beam 10 diffracted from the hologram transmits a beam modulator 15 which, as in the second exemplary embodiment, is designed as a liquid crystal display (LCD).
  • the information beam 10 is selected in terms of size and location for a transmitted partial information beam 19, so that the holographic information is only acquired from a specific spatial area of the storage medium and is evaluated.
  • the selected partial information beam 19 is expanded by means of an optical system 12, the expanded beam 13 essentially completely illuminating the CCD camera 14.
  • the optics 12 is designed such that the partial information beam 19 is imaged onto the CCD camera 14 from all spatial areas of the storage medium 8 or from all location positions of the beam modulator 15.
  • the beam modulator can also be designed to be reflective. As a result, the beam path is folded again within the device, which further reduces the space requirement of the device.

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Abstract

L'invention concerne un procédé pour lire des informations stockées holographiquement dans au moins deux zones spatiales différentes d'un support d'informations (8). Selon ledit procédé, un faisceau d'informations (10, 19) contenant les informations holographiques est généré à l'aide d'un faisceau de lecture (5, 7) constitué d'un rayonnement électromagnétique cohérent, dans le support d'informations (8). Le faisceau d'informations (10, 19) est capté à l'aide de moyens de captage (12, 14) pour la détection des informations. Le problème technique posé par la création d'un dispositif au moyen duquel les différentes zones spatiales décrites holographiquement, dans le temps le plus court, d'un support d'informations holographiques, peuvent être détectées à l'aide d'un faisceau de lecture est résolu par le fait qu'à l'aide d'un modulateur de faisceau (6, 15) spatial disposé dans le chemin des rayons, le support d'informations (8) peut être exploré de façon spatialement limitée. Le modulateur de faisceau peut, au choix, être placé devant ou derrière le support d'informations. Ce problème technique est également résolu grâce à la création d'un dispositif permettant la mise en oeuvre dudit procédé.
PCT/EP2001/005301 2000-05-11 2001-05-10 Procede et dispositif pour lire des informations stockees holographiquement WO2001086659A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001256345A AU2001256345A1 (en) 2000-05-11 2001-05-10 Method and device for reading out holographically stored information

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000122955 DE10022955A1 (de) 2000-05-11 2000-05-11 Verfahren und Vorrichtung zum Auslesen von holographisch gespeicherten Informationen
DE10022955.7 2000-05-11

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WO2001086659A1 true WO2001086659A1 (fr) 2001-11-15

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JPH1116373A (ja) * 1997-06-26 1999-01-22 Toshiba Corp ホログラムメモリ装置
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US5959747A (en) * 1996-09-11 1999-09-28 California Institute Of Technology Compact architecture for holographic systems
US5859808A (en) * 1997-06-24 1999-01-12 Lucent Technologies Inc. System and method for steering fresnel region data to access data locations in a holographic memory
JPH1116373A (ja) * 1997-06-26 1999-01-22 Toshiba Corp ホログラムメモリ装置
DE19812803A1 (de) * 1998-03-16 1999-10-07 Gf Mestechnik Gmbh Verfahren zur Herstellung eines Raumfilter-Arrays und Raumfilter-Array
US6055174A (en) * 1999-06-07 2000-04-25 Holoplex Inc. Solid state holographic memory

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PATENT ABSTRACTS OF JAPAN vol. 1999, no. 04 30 April 1999 (1999-04-30) *
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AU2001256345A1 (en) 2001-11-20

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