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WO2006118036A1 - Procede et dispositif pour enregistrer/reproduire un hologramme - Google Patents

Procede et dispositif pour enregistrer/reproduire un hologramme Download PDF

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Publication number
WO2006118036A1
WO2006118036A1 PCT/JP2006/308261 JP2006308261W WO2006118036A1 WO 2006118036 A1 WO2006118036 A1 WO 2006118036A1 JP 2006308261 W JP2006308261 W JP 2006308261W WO 2006118036 A1 WO2006118036 A1 WO 2006118036A1
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WO
WIPO (PCT)
Prior art keywords
light
hologram recording
hologram
region
reference light
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2006/308261
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English (en)
Japanese (ja)
Inventor
Makoto Sato
Yoshihisa Itoh
Yoshihisa Kubota
Masakazu Ogasawara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Corp
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 Pioneer Corp filed Critical Pioneer Corp
Priority to JP2007514634A priority Critical patent/JPWO2006118036A1/ja
Publication of WO2006118036A1 publication Critical patent/WO2006118036A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0465—Particular recording light; Beam shape or geometry
    • 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
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/42—Reflective layer
    • 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

Definitions

  • the present invention relates to a recording medium on which optical information recording or information reproduction is performed, such as an optical disk or a light field, and more particularly to hologram recording / reproduction of a recording medium having a hologram recording layer capable of recording or reproducing information by irradiation with a light beam.
  • the present invention relates to a method and an apparatus. Background art
  • Holograms that can record two-dimensional data at high density are attracting attention for high-density information recording.
  • the feature of this hologram is that the wavefront of light carrying recorded information is recorded as a change in refractive index in volume on a recording medium made of a photosensitive material such as a photorefractive material.
  • a recording medium is known in which a substrate, a hologram recording layer, and a reflection layer are formed in this order.
  • the information light is converged and irradiated so as to have the smallest diameter on the boundary surface between the hologram layer and the protective layer of the recording medium and reflected by the reflective layer.
  • the recording reference light is reflected by the hologram layer and the protective layer. Recording on the hologram recording medium by converging so that it has the smallest diameter on the front side of the boundary surface and irradiating as divergent light and causing interference
  • the information light is converged on the reflective layer, and the recording reference
  • the recording reference There is also a technology for irradiating the recording reference light so that the light is defocused on the reflective layer and the conjugate focal point of the recording reference light is located on the substrate side of the boundary surface between the substrate and the hologram recording layer.
  • an object lens configuration of an aspect in which recording / reproduction is performed from one side of a hologram recording layer of a recording medium in Japanese Patent Application Laid-Open Nos. 1-11 3 1 1 9 3 8 and 2 0 4 -1 7 1 6 1 1 Examples are shown in Figs. 1 and 2, respectively.
  • the reference light and the signal light are coaxially guided to the objective lens OB so that they overlap each other.
  • the light always interferes on the optical axis.
  • a reflective layer is placed at the focal point P of the signal light and the recording medium is placed between the objective lens and the reflective layer, the reference light and the signal light pass back and forth through the recording medium to perform hologram recording. Is called.
  • the reference light passes back and forth through the recording medium, and the reflected reference light returns to the objective lens OB together with the reproduction light.
  • the holograms specifically recorded in the recording medium are holograms A (recording interference between reflected reference light and reflected signal light), holograms, B (recording of interference between incident reference light and reflected signal light), hologram C (recording interference between reflected reference light and incident signal light), hologram D (incident There are four types of recordings where the interference between the reference beam and the incident signal beam is recorded.
  • the reproduction light obtained from the recording medium during the reproduction process is also reproduced light from the hologram A (read out by the reflected reference light), holo Reproduction light from Gram B (read out with incident reference light), reproduction light from hologram (read out with reflected reference light), reproduction light from hologram D (read out with incident reference light) 4 It is a kind.
  • an example of the problem to be solved by the present invention is to provide a hologram recording / reproducing method and a hologram apparatus that enable stable recording or reproduction.
  • a recording medium having a hologram recording layer that stores therein optical interference fringes by coherent signal light and reference light as a diffraction grating is provided on a light irradiation surface of the hologram recording layer. Wear so that the reflective layer is located on the opposite side A support part for holding freely;
  • a signal light generation unit including a spatial light modulator that is arranged on the optical axis and generates the signal light by modulating the reference light according to recording information;
  • a hologram recording apparatus comprising: an interference unit configured to irradiate the hologram recording layer with the signal light and the reference light to form a diffraction grating by optical interference fringes inside the hologram recording layer;
  • An anti-reflective mask disposed in the optical path of the reference light and partially blocking the reference light; an objective lens disposed coaxially with the anti-reflective mask and condensing the reference light that has passed through the reflective layer; It is characterized by including these.
  • the hologram reproducing device is a hologram reproducing device for reproducing information from a recording medium having a hologram recording layer in which optical interference fringes by reference light and signal light are stored as diffraction gratings.
  • a support unit that holds the recording medium so that the reflective layer is positioned on the opposite side of the light irradiation surface of the hologram recording layer;
  • An anti-reflection mask comprising a light-shielding region and a light-transmitting region which are anti-symmetric about the optical axis of the reference light, which is disposed in the optical path of the reference light and partially blocks the reference light;
  • the reference light is condensed on the reflection layer so as to pass through the anti-reflection mask and the diffraction grating of the hologram recording layer to generate reproduction light from the diffraction grating, and the reproduction light is received.
  • An objective lens ;
  • the hologram recording method according to claim 22 is a hologram recording method for recording information on a recording medium having a hologram recording layer in which optical interference fringes by reference light and signal light are stored as diffraction gratings.
  • an anti-reflection mask consisting of a light-shielding region and a light-transmitting region that are anti-symmetric about the optical axis of the reference light, which partially shields the reference light, in the optical path of the reference light;
  • a reflective layer on the opposite side of the light irradiation surface; and reflecting the reference light so as to pass through the hologram recording layer while passing through the light-transmitting region of the anti-reflection mask and converging by the objective lens. Irradiating the layer and reflecting on the reflective layer, and
  • signal light obtained by modulating the reference light according to recording information is caused to interfere with the reference light in the hologram recording layer to form a diffraction grating.
  • the hologram reproducing method according to claim 23 is a hologram reproducing method for reproducing information from a recording medium having a hologram recording layer in which optical interference fringes by reference light and signal light are stored as diffraction gratings.
  • an anti-reflection mask consisting of a light-shielding region and a light-transmitting region that are anti-symmetric about the optical axis of the reference light, which partially shields the reference light, in the optical path of the reference light;
  • 1 and 2 are schematic partial cross-sectional views showing an optical system and a recording medium for explaining conventional hologram recording.
  • FIG. 3 is a schematic partial sectional view showing a recording medium for explaining conventional hologram recording.
  • FIG. 4 is a schematic configuration diagram showing an optical system and a recording medium for explaining the recording / reproducing apparatus of the embodiment according to the present invention.
  • FIG. 5 is a schematic configuration diagram showing an optical system and a recording medium for explaining a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 6 is a schematic partial sectional view showing a recording medium according to another embodiment of the present invention.
  • 7A to 7D are front views showing a reversal mask in the recording / reproducing apparatus according to the embodiment of the present invention.
  • FIG. 13 is a schematic partial sectional view for explaining hologram recording / reproduction according to the embodiment of the present invention.
  • FIG. 14 is a schematic partial cross-sectional view showing a recording medium for explaining hologram recording of an embodiment according to the present invention.
  • FIG. 15 is a schematic partial sectional view showing an optical system for explaining hologram recording / reproduction according to an embodiment of the present invention.
  • FIGS. 16A and 16B are front views showing a reversal mask in a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 17 is a schematic configuration diagram showing an optical system and a recording medium for explaining a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 18 is a front view showing a spatial light modulator in a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 19 is a schematic configuration diagram showing an optical system and a recording medium for explaining a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 20 is a front view showing a spatial light modulator in a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 21 is a schematic configuration diagram showing an optical system and a recording medium for explaining a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 22 is a front view showing a spatial light modulator in a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 23 is a schematic configuration diagram showing an optical system and a recording medium for explaining a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 24 is a front view showing a spatial light modulator in a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 25 is a partial sectional view showing a liquid crystal element in a recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 26 is a front view as seen from the optical axis of the spatial light modulator in the recording / reproducing apparatus according to another embodiment of the present invention.
  • FIG. 27 is a schematic configuration diagram showing an optical system and a recording medium for explaining a recording / reproducing apparatus according to another embodiment of the present invention.
  • 28A to 28C are front views showing a spatial light modulator in a recording / reproducing apparatus according to another embodiment of the present invention. Detailed Description of the Invention
  • FIG. 4 shows a configuration example of the optical system of the hologram recording / reproducing apparatus in the present embodiment.
  • the hologram recording / reproducing apparatus uses a recording medium 2 having a hologram recording layer 7 that stores optical interference fringes as a diffraction grating inside the coherent signal light SB and reference light RB, as opposed to the light irradiation surface of the hologram recording layer 7.
  • a support portion (not shown) that is detachably held is provided so that the reflective layer 5 is positioned on the side.
  • the hologram recording / reproducing apparatus is roughly composed of a hologram recording and reproducing optical system. These systems share the objective lens 0B and include an objective lens drive system and a servo error detection system (not shown). It is out.
  • the hologram recording / reproducing optical system consists of a laser light source LD that generates coherent light for hologram recording and reproduction, a collimator lens CL, first and second half mirrors HM 1 and HM 2, and transmissive spatial light modulation.
  • SLM laser light source
  • anti-reverse mask RIM anti-reverse mask
  • objective lens 0B imaging lens
  • imaging lens ML CCD (Charge Coupled Device)
  • CMOS Complementary Metal Oxide Semiconductor Device
  • the anti-reverse mask RIM belonging to the reference light generation unit is composed of a light-shielding region SR and a light-transmitting region TR that are anti-symmetric about the optical axis of the reference light RB that partially blocks the reference light RB. I can arrange it.
  • the spatial light modulator SLM belonging to the signal light generation unit is arranged on the optical axis and modulates the reference light RB according to the recording information to generate the signal light SB.
  • the transmissive spatial light modulator SLM is a function of electrically shielding a part of incident light for each pixel by a liquid crystal panel having a plurality of pixel electrodes divided in a matrix, or is not transmitted and transmitted. It has a function to make a modulation state.
  • This spatial light modulator SLM is connected to a spatial light modulator driving circuit (not shown), and has a distribution based on the page data to be recorded (information pattern of two-dimensional data such as bright and dark dot patterns on a plane).
  • the signal beam SB is generated by modulating and transmitting the light flux as if it has.
  • the objective lens OB of the interference unit condenses the reference light R B that is disposed coaxially with the anti-reflection mask R I M and passes through the reflection layer 5.
  • the objective lens OB is set so that the reference light RB forms a spot without aberration on the reflection layer 5 of the recording medium.
  • the signal light S B is subjected to the action of the spatial light modulator S L M, it forms a spot that is wider than the reference light R B.
  • a hologram (diffraction grating) is formed inside the hologram recording layer 7 by the interference fringes of these lights.
  • the laser light from the light source D is divided into the optical paths of the signal light SB and the reference light RB by the first half mirror HM 1 and the second light passes through the anti-reflection mask RIM and the spatial light modulator SLM, respectively.
  • the beams are merged by the half mirror HM 2 and irradiated coaxially in the hologram recording layer 7 so as to overlap with the reference beam RB.
  • the hologram recording / reproducing apparatus omits the second half mirror HM 2 and the optical path of the reference light RB so that the signal light SB overlaps the reference light RB in the hologram recording layer 7 as shown in FIG. It can be configured to be illuminated from the outside. If the optical path of the signal light SB and the reference light RB are completely separated, any of the optical paths of the reference light RB An anti-rotation mask R IM can be placed at some place.
  • FIG. 6 shows an example of the recording medium 2.
  • the recording medium 2 includes a reflective layer 5, a separation layer 6, a hologram recording layer 7, and a protective layer 8 stacked on the substrate 3 in the film thickness direction. Note that the reflective layer 5 may be separated from the hologram recording layer 7 and configured as a separate body.
  • a light-transmitting photosensitive material capable of storing optical interference fringes such as a photopolymer, a light anisotropic material, a photorefractive material, a hole burning material, and a photochromic material is used.
  • the substrate 3 supporting each of the above films is made of, for example, glass, polycarbonate, amorphous polyolefin, polyimide, PET, PEN, PES or other plastics, UV curable acrylic resin, or the like.
  • the separation layer 6 and the protective layer 8 are made of a light transmissive material, and play a role of flattening the laminated structure and protecting the hologram recording layer and the like.
  • Anti-rotation mask R I M is a light-dark pattern that is anti-rotation in the optical path of the effective diameter of reference beam RB.
  • the anti-rotation mask RIM having strict anti-rotation symmetry means that the light shielding region SR and the light transmitting region TR are arranged around the optical axis of the reference light RB.
  • the light shielding area When a rotation operation rotating by (2m-1) is performed, the light shielding area has a pattern that overlaps the light transmitting area, and the light transmitting area overlaps the light shielding area.
  • m is an integer such as 1, 2, 3, 4, 5, 6.
  • the light-shielding pattern becomes finer, and the effect of diffraction effects at the boundary of the light-shielding Z light-transmitting region occurs.
  • the light source LD generates the reference light RB
  • the antireflection mask RIM is partially blocked by the antireflection mask RIM arranged in the optical path of the reference light RB.
  • the reflection layer 5 is irradiated so as to pass through the hologram recording layer 7 through the light transmission region TR, converged by the objective lens OB.
  • the signal light SB modulated according to the recording information and the reference light RB are caused to interfere with each other in the hologram recording layer 7 to form a diffraction grating.
  • the divergent coherent light emitted from the laser light source LD is converted into a parallel light beam by the collimator lens CL, and is condensed as the reference light RB on the recording medium 2 by the objective lens OB via the half mirror HM. Is done. Reproduced light is generated from the diffraction grating of the hologram recording layer and is reflected by the third half mirror HM 3 through the objective lens OB. Reproduced light is imaged on the image sensor IS by the imaging lens ML.
  • the generation of the reference beam RB to the irradiation of the reflective layer 5 is the same as that in the photogram recording method, and the reproduction beam is generated from the diffraction grating by the irradiation, and the reproduction beam is transmitted through the objective lens B.
  • the image sensor IS to reproduce information by photoelectric conversion.
  • normal playback is performed if playback is performed with the same anti-reverse mask R I M as during recording.
  • the objective is selected by placing the anti-reverse mask RIM in the reference beam path.
  • the light from the objective lens B to the reflective layer 5 (bound light) or the light from the reflective layer 5 to the objective lens OB (return light) Only one of them will exist.
  • the anti-rotation mask RIM having a strict anti-rotation symmetry is used, either light is always present in the irradiated portion of the recording medium 2, and there is no place where the light is not irradiated. As shown in Fig.
  • the anti-reflection mask RIM is placed in the same way during reproduction, the same reference light RB as that when the hologram is recorded is irradiated, so that only normal reproduction light appears, and phase-shared reproduction light does not appear.
  • the light shielding region SR and the light transmitting region TR of the anti-rotation mask RIM shown in FIG. 4 are provided with inversion means INV that inverts or rotates 180 degrees around the optical axis, so Phase conjugation reproduction can be achieved by reversing the light-blocking region SR and the light-transmitting region TR) of the anti-mask RIM or by rotating it 180 degrees around the optical axis.
  • inversion means INV that inverts or rotates 180 degrees around the optical axis
  • the anti-rotation mask RIM can be composed of a fixed plate-like body, but this is composed of a transmissive liquid crystal element, and at the time of writing, the liquid crystal element shows a light shielding region SR and a light transmissive region TR. It can also be controlled to be in a state.
  • the objective lens OB is an ideal lens (for example, a Fourier transform lens)
  • a light beam emitted from a point on the page data of the spatial light modulator forms an image on a point on the image plane of the image sensor IS.
  • an actual objective lens is affected by lens aberration and MTF characteristics, resulting in image blurring. This is even more conspicuous when the numerical aperture NA of the objective lens OB is large or when the image height (distance from the optical axis of the dot on the page) is large.
  • the pattern of the spatial light modulator SLM corresponds to page data.
  • a hologram is formed by interfering with the reference light RB between the objective lens OB and the reflecting layer 5. Since the reproduced light appears as if there is a page dew in the original location, the optical path of the reproduced light is the same as that of the actual objective lens during recording, and the influence of the aberration of the objective lens B and the MTF is affected. The received image is blurred on the image sensor IS.
  • phase conjugate reproduction the reproduced light appears so as to return back to the optical path of the original signal light SB. Therefore, the original page regardless of the performance of the objective lens ⁇ B The same image as the data can be formed. Therefore, if the NA of the objective lens OB to be used is large, or if there is a part where the spatial light modulator SLM has a large pattern and a large image height, the performance of the objective lens 0B can be improved by using phase conjugate reproduction. Good reproduction images can be obtained without any restrictions. However, since the phase conjugate reproduction light is inferior to the normal reproduction light in the SN ratio, it is preferable to use only the normal reproduction light if reproduction with a good SN ratio is desired. You can choose between normal playback and phase-conjugate playback depending on whether you want the SN ratio or imaging performance.
  • the shape of the anti-rotation mask RIM is not strictly anti-rotation-symmetric, and the shading area SR illustrated in FIG. 16A has a slightly smaller area than the translucent area TR. Even if the shape conforms to anti-rotation symmetry (quasi-anti-anti-symmetry), it is possible to greatly reduce the area where “bound reference light” and “return reference light” exist simultaneously in the medium. The effect of the present invention to reduce the influence of a simple hologram can be obtained.
  • the light-shielding region SR illustrated in Fig. 16B has a slightly larger area than the light-transmitting region TR, a region where no reference light exists in the medium is generated.
  • the areas of the light-shielding region SR and the light-transmitting region TR are strictly equal, and these areas can be increased or decreased if the optical paths of incident light and reflected light in the medium are limited. Can do.
  • the spatial light modulator SLM is arranged around the transmission central region TCR arranged on the optical axis that allows the reference light RB to pass through without modulation, and around the transmission central region TCR.
  • a spatial light modulation annular region SLMRR composed of a transmissive matrix liquid crystal device that modulates the reference light RB according to information and generates the signal light SB spatially separated from the reference light RB.
  • the anti-reflection mask RIM that acts only on the inner periphery may be disposed at any location so as not to affect the signal light s. .
  • the anti-reflection mask RIM is arranged so as to partially block only the reference light RB passing through the transmission central region TCR without blocking the signal light SB.
  • the transmission central region TCR can be formed of a through opening or a transparent material.
  • the transmissive central region TCR is composed of a transmissive liquid crystal element, and is controlled so that the liquid crystal element is in a translucent state during recording. On the other hand, as shown in FIG.
  • the spatial light modulator SLM and the anti-rotation mask RIM may be integrally formed, and the other configuration may be the same as the example of FIG.
  • the spatial light modulator SLM is arranged around the central mask region CMR as the anti-rotation mask RIM and the central mask region CMR and modulates the reference light RB according to the recording information.
  • a spatial light modulation annular region SLMRR composed of a transmissive matrix liquid crystal device that generates signal light SB spatially separated from the reference light RB.
  • the central mask area CMR can be composed of a fixed plate, but the central mask area CMR is composed of a transmissive liquid crystal element, and the liquid crystal element displays the light shielding area SR and the translucent area TR during recording. It can also be controlled as is.
  • the inner peripheral portion is the signal light SB and the outer peripheral portion is the reference light RB
  • the laser beam from the light source LD Only the inner peripheral part of the signal can be modulated so that the inner peripheral part is the signal light SB and the outer peripheral part is the unmodulated reference light RB.
  • the spatial light modulator SLM is a transmissive matrix liquid crystal device arranged on the optical axis that modulates the reference light RB in accordance with the recording information and generates the signal light SB.
  • Spatial light modulation central region SLM CR consisting of and a transmission annular region TRR arranged around the spatial light modulation central region S LMC R and spatially separated from the signal light SB through the reference light RB without modulation. Consists of.
  • the anti-rotation mask RIM is arranged so as to partially block only the reference light RB passing through the transmission annular region TRR without blocking the signal light SB.
  • the transmissive annular region TRR consists of a through-opening or a transparent material. Further, the transmissive annular region TRR can be constituted by a transmissive liquid crystal element and can be controlled so that the liquid crystal element is in a light-transmitting state during recording. Further, as shown in FIG.
  • the spatial light modulator SLM and the anti-rotation mask RIM may be integrally formed, and the other configuration may be the same as the example of FIG.
  • the spatial light modulator SLM modulates the reference light RB in accordance with the recording information and passes it to generate a transmission light matrix liquid crystal disposed on the optical axis. It consists of a spatial light modulation central region SLMCR consisting of a device and an annular mask region RMR as a reversal mask RIM arranged around the spatial light modulation central region SLMCR.
  • the annular mask area RMR is composed of a transmissive liquid crystal element, and the liquid crystal element is in a state where the annular mask area RM R displays the light shielding area SR and the light transmitting area TR during recording.
  • the liquid crystal device portion of the spatial light modulator SLM or anti-rotation mask RIM—body-type spatial light modulator SLM is composed of a transmissive liquid crystal element, which consists of a pair of opposing polarizing plates 80 liquid crystal layer 83 (crystal molecules) sandwiched between transparent electrodes 81 a and 81 b and alignment films 82 a and 82 b sequentially formed on the inner surfaces of a and 80 b. Layer).
  • the transparent electrodes 8 1 a and 8 1 b have one or more pairs of electrode shapes according to the shape of the anti-rotation mask RIM. As shown in FIG.
  • the spatial light modulator SLM as a whole is a transmissive matrix liquid crystal device, and its control circuit 26 displays a predetermined pattern, for example, an inner central region A and an outer peripheral region B on its outer periphery. Each can also be configured to display an anti-reflection mask area and a page data area.
  • the anti-rotation mask RIM is rotated 180 degrees around the optical axis. If a liquid crystal element is used, the same effect can be obtained only by electrical switching.
  • Liquid crystal molecules have the property of rotating the polarization plane of light (rotation) only at the part where voltage is applied.
  • the amount of rotation of the polarization plane varies depending on the thickness of the liquid crystal layer and the magnitude of the applied voltage. It is assumed that the polarization of the portion where voltage is applied between the transparent electrodes 8 1 a and 8 1 b is set to rotate 90 degrees. It is assumed that the polarization state of the light passing through the polarizing plate 80 a is linearly polarized light (referred to as A-polarized light) parallel to the paper surface.
  • the polarizing plate 80 a is a polarizing plate that allows only the A polarized light to pass therethrough, and the polarizing plate 80 b is the same.
  • a voltage is applied to the liquid crystal layer 83 only by a certain electrode pair, and the polarization plane is rotated by 90 degrees only for the light passing through this portion, and linearly polarized light perpendicular to the paper surface (referred to as B-polarized light). It becomes.
  • the polarizing plate 80 b facing thereafter passes only the A-polarized light, only the light from the other electrode pair passes, and the other light is blocked.
  • the liquid crystal element as a whole acts as an anti-rotation mask RIM that shields light only from a portion to which a voltage is applied.
  • RIM anti-rotation mask
  • the electrode pattern is made to correspond to the white and shaded portions, and voltage is applied only to the shaded portions.
  • the shaded area is the light shielding region SR.
  • the embodiment shown in FIGS. 17 to 24 (the signal light SB and the reference light RB are propagated separately along the optical axis at the inner and outer circumferences of the effective diameter of the laser beam from the light source LD.
  • the embodiment shown in FIGS. 17 to 24 it is possible to use a QSLM with an anti-reverse mask integrated spatial light modulator that divides the luminous flux into the first to fourth quadrants as viewed from the optical axis.
  • signal light SB is generated in a state in which a page data pattern for modulating the reference light RB is displayed in the first and third quadrants Ql and Q3 according to the recording information.
  • the fourth quadrant Q2 and Q4 are used as the reference beam RB (however, the second quadrant Q2 is shielded). At this time, the second and fourth quadrants Q2 and Q4 corresponding to the reference beam RB become antisymmetric.
  • the first to third quadrants Q1 to Q3 are shielded, and the reference light is in the same light transmission state (fourth quadrant Q4) as during recording.
  • phase conjugate reproduction is possible by reversing the brightness and darkness during recording (fourth quadrant Q4 is light-shielded and second quadrant is translucent). Become.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

Selon la présente invention, un dispositif d’hologramme est équipé d’une partie de support qui tient de manière montable un support d’enregistrement, qui comporte une couche d’enregistrement d’hologramme dans laquelle une frange d’interférence optique due à un faisceau de signal cohérent et un faisceau de référence est conservée sous forme de réseau de diffraction, de sorte qu’une couche de réflexion est positionnée sur un côté opposé au plan irradié par le faisceau de la couche d’enregistrement d’hologramme ; une source lumineuse destinée à générer le faisceau de référence cohérent ; une partie de génération du faisceau de signal qui comprend un modulateur lumineux spatial disposé sur un axe optique et génère le faisceau de signal en modulant le faisceau de référence correspondant à de l’information sur l’enregistrement ; et une partie d’interférence qui irradie la couche d’enregistrement de l’hologramme avec le faisceau de signal et le faisceau de référence et forme le réseau de diffraction par une frange d’interférence optique à l’intérieur de la couche d’enregistrement d’hologramme. Le dispositif d’hologramme comprend un masque d’inversion de rotation qui est agencé dans un trajet optique du faisceau de référence et bloque partiellement le faisceau de référence ; et une lentille d’objectif disposée de manière coaxiale avec ledit masque pour récupérer le faisceau de référence traversé sur la couche de réflexion.
PCT/JP2006/308261 2005-04-28 2006-04-13 Procede et dispositif pour enregistrer/reproduire un hologramme Ceased WO2006118036A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008126301A1 (fr) * 2007-03-30 2008-10-23 Pioneer Corporation Enregistreur/lecteur d'hologramme
JPWO2009025024A1 (ja) * 2007-08-20 2010-11-18 富士通株式会社 ホログラム記録装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000338846A (ja) * 1999-05-25 2000-12-08 Sony Corp ホログラム記録再生装置
WO2004102542A1 (fr) * 2003-05-13 2004-11-25 Optware Corporation Dispositif et procede optiques d'enregistrement/reproduction d'informations
JP2004361928A (ja) * 2003-05-13 2004-12-24 Optware:Kk 光情報記録方法、光情報記録装置および光情報記録再生装置
JP2005031212A (ja) * 2003-07-08 2005-02-03 Optware:Kk 光情報再生装置および光情報記憶再生装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000338846A (ja) * 1999-05-25 2000-12-08 Sony Corp ホログラム記録再生装置
WO2004102542A1 (fr) * 2003-05-13 2004-11-25 Optware Corporation Dispositif et procede optiques d'enregistrement/reproduction d'informations
JP2004361928A (ja) * 2003-05-13 2004-12-24 Optware:Kk 光情報記録方法、光情報記録装置および光情報記録再生装置
JP2005031212A (ja) * 2003-07-08 2005-02-03 Optware:Kk 光情報再生装置および光情報記憶再生装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008126301A1 (fr) * 2007-03-30 2008-10-23 Pioneer Corporation Enregistreur/lecteur d'hologramme
JPWO2008126301A1 (ja) * 2007-03-30 2010-07-22 パイオニア株式会社 ホログラム記録再生装置
JPWO2009025024A1 (ja) * 2007-08-20 2010-11-18 富士通株式会社 ホログラム記録装置

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