JP4496328B2 - ホログラム記録媒体およびホログラム記録再生装置 - Google Patents
ホログラム記録媒体およびホログラム記録再生装置 Download PDFInfo
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- JP4496328B2 JP4496328B2 JP2003312287A JP2003312287A JP4496328B2 JP 4496328 B2 JP4496328 B2 JP 4496328B2 JP 2003312287 A JP2003312287 A JP 2003312287A JP 2003312287 A JP2003312287 A JP 2003312287A JP 4496328 B2 JP4496328 B2 JP 4496328B2
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- 239000013078 crystal Substances 0.000 claims description 54
- 239000000969 carrier Substances 0.000 claims description 35
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 32
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 28
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 23
- 230000001678 irradiating effect Effects 0.000 claims description 11
- 230000006870 function Effects 0.000 claims description 5
- 239000011572 manganese Substances 0.000 description 38
- 230000035945 sensitivity Effects 0.000 description 29
- 238000010521 absorption reaction Methods 0.000 description 19
- 230000031700 light absorption Effects 0.000 description 18
- 230000009467 reduction Effects 0.000 description 16
- 230000003287 optical effect Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 14
- 230000015654 memory Effects 0.000 description 12
- 230000005684 electric field Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000008832 photodamage Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229910000980 Aluminium gallium arsenide Inorganic materials 0.000 description 1
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 229910003327 LiNbO3 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000005697 Pockels effect Effects 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Images
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
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
-
- 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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0486—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations
- G03H2001/0491—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations by monitoring the hologram formation, e.g. via a feed-back loop
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2260/00—Recording materials or recording processes
- G03H2260/50—Reactivity or recording processes
- G03H2260/54—Photorefractive reactivity wherein light induces photo-generation, redistribution and trapping of charges then a modification of refractive index, e.g. photorefractive polymer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holo Graphy (AREA)
Description
H. Guenther, G. Wittmann, and R. M. Macfarlene(IBM), R. R. Neurgaonkar(Rockwell) 「Intensity dependence and white−light gating of two−color photorefractive gratings in LiNbO3」,Opt. Lett. Vol.22, pp.1305−1307(1997) L. Hesselink, S. S. Orlov, A. Liu, A. Akella, D. Lande, and R. R. Neurgaonkar「Photorefractive Materials for Nonvolatile Volume Holographic Data Storage」, Science Vol.282(Nov6), pp.1089−1094(1998)
はじめに、本発明による、Mnを1重量ppm〜100重量ppmだけ添加した実質的に定比組成のニオブ酸リチウム単結晶(以下、Mn―SLNと称する)からなるホログラム記録媒体の記録および再生のメカニズムを説明する。
nB=K・αg・e-αg・x ………… (2)
ここで、ΔαIRは光誘起吸収係数であり、ゲート光の照射によって記録光の波長に誘起する光吸収変化である。nBは、図1における第1のエネルギー準位Aから第2のエネルギー準位Bに励起されるキャリア密度である。Kは、任意の定数である。xは、ゲート光がホログラム記録媒体に入射する表面からの距離である。上式(1)より、記録感度Sは、光誘起吸収に比例し、かつ、エネルギー準位Bのキャリア密度に比例することが分かる。上式(2)より、ホログラム記録媒体の表面から所定の距離(すなわち、x=一定の場合)におけるキャリア密度nBは、ゲート光吸収係数αgに密接に関係することが分かる。つまり、2色ホログラム方式におけるホログラム記録媒体の記録感度を高めるためには、ゲート光吸収係数αgは適正な値である必要がある。
図7は、本発明によるホログラム記録再生装置700の模式図である。ホログラム記録再生装置700は、実施の形態1で説明した本発明によるホログラム記録媒体701に情報を記録し、そのホログラム記録媒体701に記録された情報を再生する。
700 ホログラム記録再生装置
701 ホログラム記録媒体
702 第1の光源部
703 第2の光源部
704 再生部
705 再生/参照光源
706 ビームスプリッタ
707 エンコーダ
708 空間光変調器(SLM)
709 第1のレンズ
710 第2のレンズ
711 光検出器
712 デコーダ
Claims (3)
- ニオブ酸リチウム単結晶またはタンタル酸リチウム単結晶からなる2色ホログラム記録媒体であって、
前記ニオブ酸リチウム単結晶のモル分率[Li 2 O]/([Li 2 O]+[Nb 2 O 5 ])が、0.495以上0.50未満であり、
前記タンタル酸リチウム単結晶のモル分率[Li 2 O]/([Li 2 O]+[Ta 2 O 5 ])が、0.495以上0.50未満であり、
Mnのみが1重量ppm〜100重量ppm添加され、
前記Mnは、ゲート光の照射によってフォトリフラクティブ効果に関与するキャリアを生成するよう機能することを特徴とする2色ホログラム記録媒体。 - 前記ニオブ酸リチウム単結晶またはタンタル酸リチウム単結晶のエネルギー帯は、価電子帯と伝導帯との間に第1エネルギー準位、第2エネルギー準位および第3エネルギー準位を含み、
前記第1エネルギー準位は前記伝導帯を基準として前記第2エネルギー準位よりも深く、
前記第3エネルギー準位は前記伝導帯を基準として前記第2エネルギー準位よりも深く、
410nm以下の波長を有する前記ゲート光を前記ニオブ酸リチウム単結晶またはタンタル酸リチウム単結晶に照射することにより、前記第1エネルギー準位から前記第2エネルギー準位に前記キャリアが励起され、
前記ゲート光の波長よりも長い波長を有する記録光および参照光が前記ニオブ酸リチウム単結晶またはタンタル酸リチウム単結晶に照射されることにより、前記第2エネルギー準位に励起された前記キャリアが前記第3エネルギー準位に捕獲されることによって前記記録光に担持されている情報が記録されることを特徴とする、請求項1記載の2色ホログラム記録媒体。 - ホログラム記録媒体に情報を記録し、前記ホログラム記録媒体に記録された前記情報を再生する2色ホログラム記録再生装置であって、
前記ホログラム記録媒体へ410nmよりも短波長のゲート光を照射する第1照射手段と、
前記情報を担持する信号光と参照光とを前記ホログラム記録媒体へ照射する第2照射手段と、を含み、
前記信号光と前記参照光はそれぞれ前記ゲート光よりも長波長の光であり、
前記ホログラム記録媒体は、Mnのみが1重量ppmから100重量ppm添加された、モル分率[Li 2 O]/([Li 2 O]+[Nb 2 O 5 ])が0.495以上0.50未満であるニオブ酸リチウム単結晶またはモル分率[Li 2 O]/([Li 2 O]+[Ta 2 O 5 ])が0.495以上0.50未満であるタンタル酸リチウム単結晶であり、前記Mnは、前記ゲート光の照射によってフォトリフラクティブ効果に関与するキャリアを生成するよう機能することを特徴とする2色ホログラム記録再生装置。
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JP2003312287A JP4496328B2 (ja) | 2002-09-10 | 2003-09-04 | ホログラム記録媒体およびホログラム記録再生装置 |
US10/656,879 US6856433B2 (en) | 2002-09-10 | 2003-09-08 | Holographic recording medium and holographic recording/reproducing apparatus using the same |
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JP2002263809 | 2002-09-10 | ||
JP2003312287A JP4496328B2 (ja) | 2002-09-10 | 2003-09-04 | ホログラム記録媒体およびホログラム記録再生装置 |
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US6856433B2 (en) | 2005-02-15 |
US20040120020A1 (en) | 2004-06-24 |
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