NDLI: Optical storage of digital information

Content Provider	IEEE Xplore Digital Library
Author	Spitz, E. D'Auria, L. Huignard, J.
Copyright Year	1965
Abstract	Optical data storage provides a solution for the requirements of large read-write mass memories (capacity greater than 10⁸bits) with small random access time (typically several μs) with high speed data transfer rates (0.1-1 Gbit/s). The well-known properties characteristic of holographic storage, including lensless stigmatic imaging capabilities and redundancy, make the holographic storage technique attractive. When using a two-dimensional storage medium, theoretical studies indicate that an information density on the order of 2 × 10⁶bit/cm²are obtainable, or a wavelength of 0.5 μm. Even if one used optical components (lenses, etc.) having transverse dimensions as large as 80 cm, such a system would be limited to a capacity of about 10¹⁰bits. To obtain larger capacities it will be necessary to use a 3-dimensional storage medium allowing superposition of the stored information. This could be obtained by varying the angle of the holographic reference beam. A practical system for realizing such a memory is presented here. The organization of the memory is compatible with the use of a reversible storage material. The read-write functions are realized using an acoustooptic deflector, which eliminates any mechanically moving parts. The organization permits the use of a second deflector to vary the reference angle and allows superposition of holograms [1]. Possible recording materials which could be used in such memories are ferroelectric crystals or ceramics. Experiments in our laboratory have demonstrated the possibility of electrically controlling the fixation and erasure of holograms in these materials [2].
Sponsorship	IEEE Magnetics Society
Starting Page	425
Ending Page	425
Page Count	1
File Size	161606
File Format	PDF
ISSN	00189464
Volume Number	8
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1972-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Holography Image storage Ferroelectric materials Crystalline materials High speed optical techniques Holographic optical components Material storage Read-write memory Optical imaging Optical devices
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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