WO2005036538A1 - ホログラフィックメモリー再生装置、ホログラフィック記録再生装置、ホログラフィック記録再生方法及びホログラフィック記録媒体 - Google Patents
ホログラフィックメモリー再生装置、ホログラフィック記録再生装置、ホログラフィック記録再生方法及びホログラフィック記録媒体 Download PDFInfo
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- WO2005036538A1 WO2005036538A1 PCT/JP2004/014237 JP2004014237W WO2005036538A1 WO 2005036538 A1 WO2005036538 A1 WO 2005036538A1 JP 2004014237 W JP2004014237 W JP 2004014237W WO 2005036538 A1 WO2005036538 A1 WO 2005036538A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wavelength
- information
- recording
- reproducing
- holographic
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 17
- 239000004065 semiconductor Substances 0.000 claims abstract description 60
- 230000010355 oscillation Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
- G11B7/12—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
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
- G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
-
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
-
- 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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2286—Particular reconstruction light ; Beam properties
-
- 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
- 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
- G03H2001/0208—Individual components other than the hologram
- G03H2001/0212—Light sources or light beam properties
Definitions
- Holographic memory reproducing device holographic recording / reproducing device, holographic recording / reproducing method, and holographic recording medium
- the present invention relates to a holographic recording / reproducing apparatus for holographically recording and reproducing information on a recording medium, a holographic memory reproducing apparatus for reproducing recorded hologram force information, and a holographic recording / reproducing method. And holographic recording media.
- a holographic recording / reproducing method has been proposed as a recording technique which has a large recording capacity and enables high-speed transfer of information.
- a gas laser or a solid-state laser is usually used as a light source to maintain wavelength stability and coherence (uniform coherency). There is a problem that it is large and the manufacturing cost is high.
- the semiconductor laser has wavelength stability and coherency as compared with the gas laser and the solid-state laser. There is a problem that one is inferior.
- a recording layer on which a hologram is formed has a thickness of several tens m or more, preferably 100 m or more, in order to increase the recording density.
- Such a thick hologram has angle selectivity and wavelength selectivity of a reproduction laser beam, and can reproduce information only when a reference beam is incident at an angle and a wavelength under recording conditions.
- multiplexed information is recorded in the same volume by appropriately changing the angle condition of the reference light and the like.
- the reproduction light intensity (diffraction light intensity) is When two-dimensional data is recorded on the hologram, there is a problem that the two-dimensional data is reproduced in a distorted state.
- the decrease or distortion of the reproduction light intensity as described above can be corrected by the design and modulation pattern of an element such as a CCD or a CMOS that captures two-dimensional data. Large and difficult to correct.
- Japanese Patent Application Laid-Open No. 2002-216359 discloses an optical waveguide type wavelength conversion device because an optimal reproduction light wavelength changes due to thermal expansion and contraction of a recording medium during reproduction of holographic recording.
- the wavelength of the reproducing laser beam is changed according to the thermal expansion and contraction of the recording medium by using a wavelength-variable semiconductor laser including the laser as a light source.
- Japanese Patent Application Laid-Open No. 8-202246 proposes a hologram recording apparatus using a temperature control element and a Fabry-Perot etalon in order to maintain the wavelength stability of a semiconductor laser during recording.
- this hologram recording apparatus the temperature of the semiconductor laser and the injection current are stabilized to stabilize the wavelength of the laser beam during recording.
- a tunable semiconductor laser as a tunable coherent light source and an optical waveguide type wavelength conversion device are controlled based on the state of a reproduced signal light. Since the wavelength of the reproduction light is optimized, there is a problem that it takes a long time from the start of the reproduction apparatus until the laser light actually has the optimum wavelength.
- the semiconductor laser in the reproduction apparatus is If the ambient temperature is too high or too low and the oscillation peak wavelength deviates from the wavelength power of the laser beam during recording, it will be difficult to reproduce. There is a title.
- the present invention has been made in view of the above-mentioned conventional problems, and has a structure in which a laser beam having an optimum wavelength is reproduced at a fast speed at the time of reproduction. It is an object of the present invention to provide a holographic recording / reproducing device, a holographic recording / reproducing method, a holographic memory reproducing device, and a holographic recording medium used for these devices.
- the present inventor previously records the wavelength information of the laser beam at the time of recording as a wavelength address hologram in a holographic manner, and controls the temperature of the semiconductor laser during information reproduction based on this recording. This has made it possible to use a reproduction laser beam having an optimum wavelength.
- a holographic recording medium in which wavelength information of a recording laser beam is recorded as a wavelength address hologram is irradiated with a reproducing laser beam from a semiconductor laser to reproduce the information recorded in the holographic head.
- a holographic memory reproducing device for controlling the temperature of the semiconductor laser; and reproducing the information recorded on the holographic recording medium by the reproducing laser beam. Based on the wavelength information reproduced from the wavelength address hologram by the reproduction laser light, the temperature of the reproduction laser light is adjusted via the temperature controller so that the wavelength of the reproduction laser light substantially matches the wavelength of the recording laser light.
- a holographic memory reproducing device comprising: a wavelength controller that controls the wavelength by adjusting the temperature of the semiconductor laser.
- the wavelength control device is configured to adjust the intensity of the diffracted signal light from the wavelength address hologram at the time of irradiation with the reproduction laser light so as to reach a constant value, or to detect the signal light.
- the wavelength control device has information on an oscillation peak wavelength corresponding to the temperature of the semiconductor laser, and controls the semiconductor laser so that the oscillation peak wavelength coincides with the wavelength of the recording laser light.
- a device for reproducing a memory is provided.
- a reproducing apparatus comprising: a semiconductor laser that generates the recording laser light and the reproducing laser light; a temperature control device capable of controlling a temperature of the semiconductor laser; and a recording apparatus that controls a temperature of the holographic recording medium by the recording laser light.
- the wavelength information recording apparatus records the wavelength information of the recording laser light as a wavelength address hologram on the holographic recording medium, and the wavelength information recording apparatus records the wavelength information of the recording laser light on the holographic recording medium using the reproducing laser light.
- a wavelength controller that adjusts the temperature of the semiconductor laser via the temperature controller to control the wavelength such that the wavelength of the reproduction laser light substantially matches the wavelength of the recording laser light.
- a holographic recording / reproducing apparatus comprising:
- the wavelength control device may be configured such that the intensity of the signal light diffracted by the wavelength address hologram at the time of irradiation with the reproduction laser light reaches a constant value, or the signal light is detected.
- the wavelength control device has information on an oscillation peak wavelength corresponding to the temperature of the semiconductor laser, and controls the semiconductor laser so that the oscillation peak wavelength coincides with the wavelength of the recording laser light.
- Holographic recording for recording information on a holographic recording medium using a recording laser beam and reproducing information recorded on the holographic recording medium using a reproducing laser beam.
- a reproducing method wherein, when information is recorded on the holographic recording medium by the recording laser light, the wavelength information of the recording laser light is recorded as a wavelength address hologram on the holographic recording medium. Before reproducing the information recorded on the holographic recording medium by the reproducing laser light, irradiating the wavelength address hologram and diffracting the wavelength from the diffracted signal light.
- the step of reproducing the information and the temperature of the semiconductor laser that emits the laser beam for reproduction are set based on the reproduced wavelength information such that the wavelength of the laser beam for reproduction substantially matches the wavelength according to the wavelength information. Adjusting the holographic recording and reproducing method.
- the intensity of the signal light diffracted from the wavelength address hologram at the time of irradiation with the reproduction laser light is set so as to reach a predetermined value, or the detection position of the signal light is set at a predetermined position.
- Holographic recording characterized in that information is recorded in the data area as a hologram, and the wavelength information of the recording laser beam at the time of information recording is recorded as a wavelength address hologram. Medium.
- an increase in temperature causes a decrease in an energy gap, a change in a refractive index, and an expansion of a resonator length, and the oscillation wavelength shifts to a longer wavelength side.
- the amount of this shift depends on the material and structure of the semiconductor laser, but is 0.05-0.3 nmZ ° C.
- wavelength control of about 7 nm can be performed by adjusting the temperature to 30 ° C.
- FIG. 1 is an optical system diagram showing a holographic memory reproducing device according to a first embodiment of the present invention.
- FIG. 2 is a plan view schematically showing a holo-drama recording medium on which information to be reproduced by the holographic memory reproducing device is recorded.
- FIG. 3 is an optical system diagram showing a holographic recording / reproducing apparatus according to Embodiment 2 of the present invention.
- the wavelength information of the laser beam at the time of recording the hologram is recorded in advance in the holographic recording medium as a wavelength address hologram, and the reproducing semiconductor laser is provided with a temperature controller for controlling the temperature.
- the wavelength address hologram portion is irradiated while changing the oscillation peak wavelength by increasing or decreasing the temperature of the semiconductor laser via the temperature controller by the wavelength controller. Until the signal light (diffraction light) from the wavelength address hologram reaches a predetermined intensity or detection position.
- Example 1 of the present invention will be described in detail with reference to the drawings.
- the holographic memory reproducing device 10 includes a semiconductor laser 12 that oscillates a laser beam for reproduction, and a laser beam for reproduction emitted from the semiconductor laser 12.
- a beam expander 14 for expanding the beam diameter, a lens 18 for guiding the reproduction laser beam whose beam diameter has been expanded by the beam expander 14 to a holographic recording medium 16, and a laser beam 18 are irradiated through the lens 18.
- a spatial imaging element 22 for receiving, via a lens 20, a signal light obtained by diffracting the reproduced laser light by the holographic recording medium 16, and a wavelength control device 24 to which a signal detected by the spatial imaging element 22 is input.
- a temperature control device 26 attached to the semiconductor laser 12 and configured to control the temperature of the semiconductor laser 12 based on a control signal from the wavelength control device 24. It has been done.
- the temperature control device 26 is capable of controlling the temperature of the semiconductor laser 12 within a certain range, for example, by using a Peltier element alone, a combination of a thermocouple and a heater, or a combination of a Peltier element and another element. Being done.
- a wavelength address hologram 28 is recorded at a position where the holographic memory reproducing device 10 first accesses the holographic memory during reproduction.
- a wavelength address hologram 28 is recorded in a lead-in area 16 A of an inner peripheral portion thereof.
- the wavelength information of the reference light when hologram recording is performed on the holographic recording medium 16 is recorded as a two-dimensional signal pattern having a fixed detection position.
- modulation of a specific pattern is produced by a spatial light modulator (not shown), and this specific pattern is irradiated on the lead-in area 16A.
- reference numeral 16B indicates a data area
- 16C indicates a clamping area
- 16D indicates a center hole.
- the wavelength address hologram 28 is sequentially read during reproduction in addition to the lead-in area 16A.
- the wavelength address hologram 28 may be included in a part of the two-dimensional data.
- the wavelength address hologram 28 is a force volume phase hologram that can be recorded on a substrate as a relief hologram having a concavo-convex pattern, and has a form similar to data in the recording layer of the holographic recording medium 16. It can also be recorded with. In this case, the same optical path and detector as the reproduction laser beam at the time of reproduction can be used, which is more preferable.
- the power of irradiating the wavelength address hologram 28 Since the detection position of the signal pattern of the wavelength address hologram 28 is determined in advance, the recorded wavelength address hologram 30 and the semiconductor laser 12 are reproduced. When there is a wavelength shift between the laser beams, the detection position also deviates from a predetermined position force, and the signal intensity obtained by the spatial imaging element 22 decreases. The case where the displacement is too large and the signal strength obtained by the spatial imaging element 22 is zero will be described later.
- the wavelength control device 24 detects a shift of the wavelength of the laser beam for reproduction from the wavelength of the laser beam for recording at the time of hologram recording based on the position shift, and the temperature controller 26 controls the temperature of the semiconductor laser 12. Perform control.
- This temperature control is repeated until the force at which the detection position of the wavelength address hologram 28 becomes a predetermined position or the signal intensity exceeds a certain value, and the laser light for reproduction from the semiconductor laser 12 and the hologram recording
- the temperature controller 26 is controlled so that the wavelengths of the laser beams coincide with each other, and the temperature of the semiconductor laser 12 is maintained at that time.
- the signal position detected by the spatial image sensor 22 is shifted from a predetermined position, and when the amount of this position shift is detected, the laser beam and the laser beam for recording are read from the position shift amount.
- the wavelength shift amount of the single light is calculated, the drive current of the temperature adjusting device 26 is controlled according to the wavelength shift amount, and the temperature of the temperature adjusting device 26 is set by the control signal. space When the signal strength obtained by the image sensor 22 is zero, the drive current is changed in the increasing or decreasing direction until some signal strength is obtained, and the above-described control is performed from there.
- signals recorded at a plurality of recording wavelengths other than those described above can be used.
- a signal pattern corresponding to a recording wavelength, a recording wavelength ⁇ nm ( ⁇ ), and a recording wavelength + ⁇ nm (+) is adopted, and the recording wavelengths of ( ⁇ ) and (+) are used. From the signal intensity difference, the wavelength of the semiconductor laser 12 is detected, and the temperature of the semiconductor laser 12 is controlled by the temperature controller 26 to change the oscillation peak wavelength.
- the above operation is repeated until the signal intensity difference between the recording wavelengths of (1) and (+) disappears or the signal intensity of the recording wavelength exceeds a certain value, and the reproduction laser beam and the laser beam during hologram recording are repeated. What is necessary is just to control the temperature control device 26 so that the wavelengths of the wavelengths are matched and the temperature is maintained.
- the temperature of the semiconductor laser 12 is changed by the temperature adjusting device 26 during reproduction of the wavelength address hologram 28, and the detection position of the wavelength address hologram 28 is changed to a predetermined position.
- the temperature at the time when the signal strength exceeds or when the signal strength exceeds a certain value may be measured, and the temperature controller 26 may be controlled so as to maintain this temperature.
- the temperature control for the wavelength shift amount can be easily performed.
- the light sources of the laser light for recording on the holographic recording medium 16 and the laser light for reproduction can be different.
- a Kr ion laser (wavelength 406.7 nm) is used as a recording laser beam to record information and a wavelength address hologram
- a GaN semiconductor laser (oscillation peak wavelength 405 nm) is used as a reproduction laser beam. It comes out.
- an initial temperature is set to the wavelength control device 26 so that the wavelength of the recording laser light and the wavelength of the reproduction laser light are close to each other. It is preferable to keep it.
- the temperature width of the temperature control is narrowed, and the reproducing operation can be further shortened.
- FIG. 3 Next, a second embodiment of the present invention shown in FIG. 3 will be described.
- the same apparatus records information and a wavelength address hologram on a holographic recording medium and reproduces the recorded information on the holographic recording medium.
- the holographic recording / reproducing apparatus 30 includes the holographic memory / reproducing apparatus 10 in which the laser beam from the semiconductor laser 12 is split by the beam splitter 34 and is converted into the holographic recording medium 16 as object light.
- An object optical system 32 for guiding the object is provided.
- the other configuration is the same as that of the holographic memory reproducing device 10, and therefore, the same configuration is denoted by the same reference numeral as in FIG. 1 and the description is omitted.
- the object optical system 32 includes a mirror 36 for guiding the laser beam branched from the beam splitter 34, a spatial light modulator 38, and a Fourier lens 40.
- the laser light emitted from the semiconductor laser 12 is branched, and one of the laser light is used as reference light to the holographic recording medium 16 via the beam expander 14 and the lens 18.
- the other light is reflected by a mirror 36 as object light, is spatially modulated by a spatial light modulator 38 in accordance with information to be recorded, and is irradiated on a holographic recording medium 16 via a Fourier lens 40.
- the wavelength address hologram 28 is recorded by irradiating the lead-in area 16A or the data area 18B with a specific pattern created by the spatial light modulator 38.
- the present invention utilizes the wavelength information of the recording laser light at the time of recording, which is recorded in advance as a wavelength address hologram, so that the wavelength of the reproducing laser light at the time of reproduction matches the above-mentioned wavelength. It is possible to use a semiconductor laser having a variation in peak wavelength, to start up the reproducing operation quickly, and to use a reproducing laser beam having an optimal wavelength corresponding to each recording medium.
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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
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/573,802 US7446916B2 (en) | 2003-10-08 | 2004-09-29 | Holographic recording and reproduction apparatus, and method with temperature adjustment device for semiconductor laser |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003348969A JP2005116063A (ja) | 2003-10-08 | 2003-10-08 | ホログラフィックメモリー再生装置、ホログラフィック記録再生装置、ホログラフィック記録再生方法及びホログラフィック記録媒体 |
JP2003-348969 | 2003-10-08 |
Publications (1)
Publication Number | Publication Date |
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WO2005036538A1 true WO2005036538A1 (ja) | 2005-04-21 |
Family
ID=34430989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/014237 WO2005036538A1 (ja) | 2003-10-08 | 2004-09-29 | ホログラフィックメモリー再生装置、ホログラフィック記録再生装置、ホログラフィック記録再生方法及びホログラフィック記録媒体 |
Country Status (3)
Country | Link |
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US (1) | US7446916B2 (ja) |
JP (1) | JP2005116063A (ja) |
WO (1) | WO2005036538A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1845523A1 (en) * | 2006-04-13 | 2007-10-17 | Deutsche Thomson-Brandt Gmbh | Method for wavelength mismatch compensation in a holographic storage system |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006349831A (ja) * | 2005-06-14 | 2006-12-28 | Sony Corp | ホログラム記録再生媒体、ホログラム記録装置、ホログラム再生装置、ホログラム記録再生媒体の記録方法およびホログラム記録再生媒体の再生方法 |
JP4461387B2 (ja) | 2005-12-12 | 2010-05-12 | ソニー株式会社 | ホログラフィック記録媒体、ホログラフィック記録システム及びホログラフィック再生システム |
KR101199381B1 (ko) * | 2006-01-24 | 2012-11-09 | 엘지전자 주식회사 | 홀로그래픽 정보 기록/재생 방법 및 장치 |
WO2008001434A1 (fr) * | 2006-06-28 | 2008-01-03 | Fujitsu Limited | Dispositif et procédé d'enregistrement d'hologramme |
JP4919790B2 (ja) | 2006-12-15 | 2012-04-18 | シャープ株式会社 | 波長制御方法、ホログラム情報処理装置およびホログラム記録媒体 |
KR20080078253A (ko) * | 2007-02-22 | 2008-08-27 | 삼성전자주식회사 | 기록 재생 방법 및 장치 |
JP5238209B2 (ja) * | 2007-09-28 | 2013-07-17 | 株式会社日立製作所 | 光情報記録再生装置とその方法および光情報記録媒体 |
Citations (3)
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JPS6189527A (ja) * | 1984-10-08 | 1986-05-07 | Nec Corp | 波長検出装置 |
JPH0493881A (ja) * | 1990-08-06 | 1992-03-26 | Hitachi Maxell Ltd | ホログラムメモリ |
JP2002216359A (ja) * | 2000-11-17 | 2002-08-02 | Matsushita Electric Ind Co Ltd | ホログラフィック光情報記録再生装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2609593B2 (ja) * | 1986-10-24 | 1997-05-14 | 株式会社日立製作所 | ディスク媒体の記録方法及びディスク装置 |
JPH08202246A (ja) | 1995-01-23 | 1996-08-09 | Olympus Optical Co Ltd | ホログラム記録装置 |
US6958967B2 (en) | 2000-11-17 | 2005-10-25 | Matsushita Electric Industrial Co., Ltd. | Holographic optical information recording/reproducing device |
US6825960B2 (en) * | 2002-01-15 | 2004-11-30 | Inphase Technologies, Inc. | System and method for bitwise readout holographic ROM |
-
2003
- 2003-10-08 JP JP2003348969A patent/JP2005116063A/ja active Pending
-
2004
- 2004-09-29 WO PCT/JP2004/014237 patent/WO2005036538A1/ja active Application Filing
- 2004-09-29 US US10/573,802 patent/US7446916B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6189527A (ja) * | 1984-10-08 | 1986-05-07 | Nec Corp | 波長検出装置 |
JPH0493881A (ja) * | 1990-08-06 | 1992-03-26 | Hitachi Maxell Ltd | ホログラムメモリ |
JP2002216359A (ja) * | 2000-11-17 | 2002-08-02 | Matsushita Electric Ind Co Ltd | ホログラフィック光情報記録再生装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1845523A1 (en) * | 2006-04-13 | 2007-10-17 | Deutsche Thomson-Brandt Gmbh | Method for wavelength mismatch compensation in a holographic storage system |
US7876482B2 (en) | 2006-04-13 | 2011-01-25 | Thomson Licensing | Method for wavelength mismatch compensation in a holographic storage system |
Also Published As
Publication number | Publication date |
---|---|
US7446916B2 (en) | 2008-11-04 |
US20060280210A1 (en) | 2006-12-14 |
JP2005116063A (ja) | 2005-04-28 |
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