KR980003932A - 홀로그라피 저장 방법 및 장치 - Google Patents
홀로그라피 저장 방법 및 장치 Download PDFInfo
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- KR980003932A KR980003932A KR1019970014914A KR19970014914A KR980003932A KR 980003932 A KR980003932 A KR 980003932A KR 1019970014914 A KR1019970014914 A KR 1019970014914A KR 19970014914 A KR19970014914 A KR 19970014914A KR 980003932 A KR980003932 A KR 980003932A
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- South Korea
- Prior art keywords
- ions
- holographic
- dopant
- recording
- excitation
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract 12
- 239000002019 doping agent Substances 0.000 claims abstract 17
- -1 rare earth ions Chemical class 0.000 claims abstract 17
- 230000005284 excitation Effects 0.000 claims abstract 8
- 239000000463 material Substances 0.000 claims abstract 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract 7
- 230000003287 optical effect Effects 0.000 claims abstract 6
- 229910001428 transition metal ion Inorganic materials 0.000 claims abstract 5
- 150000002500 ions Chemical class 0.000 claims 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 6
- 230000005855 radiation Effects 0.000 claims 6
- 230000001427 coherent effect Effects 0.000 claims 5
- 229910052691 Erbium Inorganic materials 0.000 claims 4
- 229910052689 Holmium Inorganic materials 0.000 claims 4
- 229910052777 Praseodymium Inorganic materials 0.000 claims 4
- 239000002800 charge carrier Substances 0.000 claims 4
- 238000001093 holography Methods 0.000 claims 4
- 229910052742 iron Inorganic materials 0.000 claims 4
- 239000010936 titanium Substances 0.000 claims 4
- 229910052719 titanium Inorganic materials 0.000 claims 4
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims 2
- 229910052775 Thulium Inorganic materials 0.000 claims 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 2
- WOIHABYNKOEWFG-UHFFFAOYSA-N [Sr].[Ba] Chemical compound [Sr].[Ba] WOIHABYNKOEWFG-UHFFFAOYSA-N 0.000 claims 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims 2
- 229910002113 barium titanate Inorganic materials 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 229910052804 chromium Inorganic materials 0.000 claims 2
- 239000011651 chromium Substances 0.000 claims 2
- 229910017052 cobalt Inorganic materials 0.000 claims 2
- 239000010941 cobalt Substances 0.000 claims 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 2
- 229910001429 cobalt ion Inorganic materials 0.000 claims 2
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims 2
- 229910052802 copper Inorganic materials 0.000 claims 2
- 239000010949 copper Substances 0.000 claims 2
- 229910001431 copper ion Inorganic materials 0.000 claims 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims 2
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims 2
- 230000005670 electromagnetic radiation Effects 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- 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
- 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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24044—Recording layers for storing optical interference patterns, e.g. holograms; for storing data in three dimensions, e.g. volume storage
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
-
- 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
- G03H2001/026—Recording materials or recording processes
-
- 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
- G03H2001/026—Recording materials or recording processes
- G03H2001/0268—Inorganic recording material, e.g. photorefractive crystal [PRC]
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Holo Graphy (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
본 발명은 회토류 이온들로부터 선택된 여기 도펀트와 전이 금속 이온들 또는 회토류 이온들로부터 선택된 이온화 도펀트로 도핑된 광학 굴절 물질을 포함하는 홀로그라피 기록 매질에 기록하는 2-광자 프로세스에 관한 것이다.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
Claims (13)
- 회토류 이온들 (rare earth ions)로부터 선택된 여기 도펀트(excitation dopant)와 전이 금속 이온들(transition metal ions) 또는 회토류 이온들로부터 선택된 이온화 도펀트(ionization dopant)로 도핑된 광학 굴절 물질(photorefractive material)을 포함하는 홀로그라피 기록 매질(holographic recording medium)에 기록하는 방법에 있어서, (ⅰ) 제1파장의 제1간섭성 방사 비임(coherent radiation beam)을 참조 비임(reference beam)과 공간 변조된 물제 비임(spatially modulated object beam)으로 분리(separate)하는 단계, (ⅱ) 상기 참조 비임과 상기 공간 변조된 물체 비임을 상기 홀로그라피 기록 매질의 기록 영역에서 교차(intersect)시키는 단계, 및 (ⅲ) 상기 제1파장과 다른 제2파장의 제2방사 비임을 상기 기록 영역으로 향하도록(direct)하여 상기 제1 및 제2파장의 광자들이 이온화 도펀트(ionixation dopant)에 에너지를 전달하는 여기 도펀트(excitation dopant)에 의해 흡수되도록 함으로써 전하 캐리어(charge carrier)를 발생시켜 홀로그라피 기록 매질에 전하 격자(charge grating)를 기록하는 단계를 포함하는 홀로그라피 기록 방법.
- 제1항에 있어서, 상기 광학 굴절 물질은 강유전체(ferroelectric)인 홀로그라피 기록 방법.
- 제2항에 있어서, 상기 이온화 도펀트는 전이 금속 이온(transition metal ion)인 홀로그라피 기록 방법.
- 제2항에 있어서, 상기 광학 굴절 물질은 리튬 니오브산염(lithium niobate), 리튬 탄탈산염(lithium tantalate), 바륨 티탄산염(barium titanate) 및 스트론튬 바륨 니오브산염(strontium barium niobate)로부터 선택되는 홀로그라피 기록 방법.
- 제4항에 있어서, 상기 여기 도펀트는 에르븀 이온, 프라세오디뮴 이온, 홀뮴 이온 및 튤륨 이온(ions of erbium, praseodymium, holmium and thulium)으로부터 선택되는 홀로그라피 기록 방법.
- 제4항에 있어서, 상기 이온화 도펀트는 철 이온, 구리 이온, 코발트 이온, 티타늄 이온 및 크롬 이온(ions of iron, copper, cobalt, titanium and chromium)으로부터 선택되는 홀로그라피 기록 방법.
- a) 회토류 이온들 (rare earth ions)로부터 선택된 여기 도펀트(excitation dopant)와 전이 금속 이온들(transition metal ions) 또는 회토류 이온들로부터 선택된 이온화 도펀트(ionization dopant)로 도핑된 광학 굴절 물질(photorefractive material)을 포함하는 홀로그라피 기록 매질(holographic recording medium) b)레이저 비임을 형성하는 레이저, c) 상기 레이저 비임을 2개의 간섭성 전자기 방사 비임(two beams of coherent electromagnetic ratioation)으로 분할하는 비임 스플리터(beam spiltter), d) 상기 간섭성 방사 비임 중 하나에 공간 정보를 싣는(impress) 변조기, e) 상기 2개의 간섭성 방사 비임이 상기 기록 매질에서 서로 교차하도록 하는 거울(mirror), 및 f) 제3전자기 방사 비임이 상기 기록 매질로 향하도록 하는 전자기 방사원(electromagnetic ratiation source)을 구비한 홀로그라피 저장 장치(holographic storage device).
- 제7항에 있어서, 상기 광학 굴절 물질은 강유전체인 홀로그라피 저장 장치.
- 제8항에 있어서, 상기 이온화 도펀트는 전이 금속 이온(transition metal ion)인 홀로그라피 저장 장치.
- 제9항에 있어서, 상기 광학 굴절 물질은 리튬 니오브산염(lithium niobate), 리튬 탄탈산염(lithium tantalate), 바륨 티탄산염(barium titanate) 및 스트론튬 바륨 니오브산염(strontium barium niobate)로부터 선택되는 홀로그라피 기록 방법.
- 제10항에 있어서, 상기 여기 도펀트는 에르븀 이온, 프라세오디뮴 이온, 홀뮴 이온 및 튤륨 이온(ions of erbium, praseodymium, holmium and thulium)으로부터 선택되는 홀로그라피 기록 방법.
- 제11항에 있어서, 상기 이온화 도펀트는 철 이온, 구리 이온, 코발트 이온, 티타늄 이온 및 크롬 이온(ions of iron, copper, cobalt, titanium and chromium)으로부터 선택되는 홀로그라피 기록 방법.
- 폴리머(polymer), 비선형 광학 발색단(non linear optical chromophore), 전하 전달 매개체(charge transport agent), 감광체(sensitizer) 및 회토류 이온들로부터 선택된 여기 도펀트를 포함하는 홀로그라피 광학 굴절 기록 매질(holographic photorefractive recording medium)에 기록하는 방법에 있어서, (ⅰ) 제1파장의 제1간섭성 방사 비임(coherent radiation beam)을 참조 비임(reference beam)과 공간 변조된 물제 비임(spatially modulated object beam)으로 분리(separate)하는 단계, (ⅱ) 상기 참조 비임과 상기 공간 변조된 물체 비임을 상기 홀로그라피 기록 매질의 기록 영역에서 교차(intersect)시키는 단계, 및 (ⅲ) 상기 제1파장과 다른 제2파장의 제2방사 비임을 상기 기록 영역으로 향하도록(direct)하여 상기 제1 및 제2파장의 광자들이 상기 감광제에 에너지를 전달하는 여기 도펀트(excitation dopant)에 의해 흡수되도록 함으로써 전하 캐리어(charge carrier)를 발생시켜 홀로그라피 기록 매질에 전하 격자(charge grating)를 기록하는 단계를 포함하는 홀로그라피 기록 방법.※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/665,258 US5739929A (en) | 1996-06-17 | 1996-06-17 | Method and device for holographic storage |
| US8/665,258 | 1996-06-17 | ||
| US08/665,258 | 1996-06-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR980003932A true KR980003932A (ko) | 1998-03-30 |
| KR100246160B1 KR100246160B1 (ko) | 2000-03-15 |
Family
ID=24669373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019970014914A KR100246160B1 (ko) | 1996-06-17 | 1997-04-22 | 홀로그라피 저장 방법 및 장치 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5739929A (ko) |
| JP (1) | JP3963333B2 (ko) |
| KR (1) | KR100246160B1 (ko) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5847851A (en) * | 1997-03-06 | 1998-12-08 | Hughes Electronics Corporation | Double-doped BaTiO3 crystal for holographic storage |
| US6157470A (en) * | 1998-02-26 | 2000-12-05 | California Institute Of Technology | Non-volatile holographic storage in doubly-doped photorefractive material |
| KR20010112273A (ko) | 1999-02-17 | 2001-12-20 | 추후 | 광굴절 고분자를 이용한 삭제/재기록 가능한 광 데이터 저장 |
| US6468699B2 (en) * | 1999-05-14 | 2002-10-22 | Adil Lahrichi | Reversible hologram fixation in photorefractive materials using incoherent ultraviolet light |
| JP2001216649A (ja) * | 2000-01-31 | 2001-08-10 | Central Glass Co Ltd | 三次元光メモリー媒体及びその記録方法 |
| AUPQ542400A0 (en) * | 2000-02-03 | 2000-02-24 | University Of Sydney, The | Method of inducing changes in a photosensitive material |
| US6624915B1 (en) * | 2000-03-16 | 2003-09-23 | Science Applications International Corporation | Holographic recording and micro/nanofabrication via ultrafast holographic two-photon induced photopolymerization (H-TPIP) |
| JP4124417B2 (ja) * | 2002-02-13 | 2008-07-23 | 独立行政法人科学技術振興機構 | ピコ秒レーザーによるホログラムの製造方法 |
| TWI241322B (en) * | 2002-12-31 | 2005-10-11 | Ind Tech Res Inst | Recording medium dye, high density blue ray recording medium and manufacturing method thereof |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3915549A (en) * | 1971-11-08 | 1975-10-28 | Rca Corp | Crystals for recording phase holograms |
| US3773400A (en) * | 1972-10-10 | 1973-11-20 | Rca Corp | Process for fixing holographic patterns in electro-optic crystals and the crystals produced thereby |
| US3933504A (en) * | 1973-03-27 | 1976-01-20 | Rca Corporation | Photochromic lithium niobate and method for preparing same |
| US3799642A (en) * | 1973-03-27 | 1974-03-26 | Rca Corp | Holographic recording on photochromic lithium niobate |
| US3922061A (en) * | 1974-06-10 | 1975-11-25 | Bell Telephone Labor Inc | Optical storage apparatus and process |
| JPS51112357A (en) * | 1975-01-27 | 1976-10-04 | Hitachi Ltd | Element for light damage |
| US4052119A (en) * | 1976-03-29 | 1977-10-04 | Rca Corporation | Crystals for recording phase holograms |
| US4101976A (en) * | 1977-02-14 | 1978-07-18 | International Business Machines Corporation | Frequency selective optical data storage system |
| US4339513A (en) * | 1980-07-21 | 1982-07-13 | International Business Machines Corporation | Process and recording media for continuous wave four-level, two-photon holography |
| FR2509485A1 (fr) * | 1981-07-07 | 1983-01-14 | Thomson Csf | Procede holographique d'enregistrement-lecture et dispositif mettant en oeuvre ce procede |
| US4811289A (en) * | 1985-07-08 | 1989-03-07 | Harry Sadjian | Optical recording device enploying doped crystal for optically storing information |
| US4728165A (en) * | 1986-11-05 | 1988-03-01 | Research Corporation | Superimposed fast transient and permanent holographic gratings |
| US5440669A (en) * | 1991-07-26 | 1995-08-08 | Accuwave Corporation | Photorefractive systems and methods |
| US5361148A (en) * | 1993-01-21 | 1994-11-01 | International Business Machines Corporation | Apparatus for photorefractive two beam coupling |
| US5665493A (en) * | 1995-10-03 | 1997-09-09 | Sri International | Gated recording of holograms using rare-earth doped ferroelectric materials |
-
1996
- 1996-06-17 US US08/665,258 patent/US5739929A/en not_active Expired - Fee Related
-
1997
- 1997-04-22 KR KR1019970014914A patent/KR100246160B1/ko not_active IP Right Cessation
- 1997-06-03 JP JP14497397A patent/JP3963333B2/ja not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5739929A (en) | 1998-04-14 |
| JP3963333B2 (ja) | 2007-08-22 |
| KR100246160B1 (ko) | 2000-03-15 |
| JPH10105029A (ja) | 1998-04-24 |
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