This document provides an introduction to holography and holographic data storage. Holography was developed in 1947 by Dennis Gabor and involves recording interference patterns of light to reproduce a 3D object. Holographic data storage uses a reference beam and information beam to record data as an interference pattern in a storage medium, allowing the data to be read quickly using only the reference beam. Holographic data storage offers significantly higher storage capacity than technologies like CDs and DVDs, with the potential to store 3.9 terabytes in a single disk.
1. A
Seminar on
INTRODUCTION TO HOLOGRAPHYINTRODUCTION TO HOLOGRAPHY
Presented By
SWAPNIL G. THAWARE
20100764
MOB NO 7588057887
Dr. Babasaheb Ambedkar Technological University,
Department Of Information technology Engineering
LONERE-402 103
2011-2012
2. Hologram HistoryHologram History
Hologram is from theHologram is from the
Greek word holosGreek word holos
Theory Developed in 1947 by British scientistTheory Developed in 1947 by British scientist
Dr.Dennis Gabor(Nobel prize winner )Dr.Dennis Gabor(Nobel prize winner )
Developed because he was trying to improveDeveloped because he was trying to improve
the resolution of electron microscopesthe resolution of electron microscopes
3. HolographyHolography Holography is a methodHolography is a method
of recording patterns ofof recording patterns of lightlight to produceto produce
a three-dimensional object.a three-dimensional object.
HologramHologram :: The recorded patterns ofThe recorded patterns of
light are called a hologramlight are called a hologram
The process is accomplished by usingThe process is accomplished by using
two laser beams, instead of one, totwo laser beams, instead of one, to
4. Coherent LightCoherent Light
Development in this field was stifledDevelopment in this field was stifled
during the 1950’s because light sourcesduring the 1950’s because light sources
were not coherent.were not coherent.
Coherent light is light that isCoherent light is light that is
monochromatic and of a singlemonochromatic and of a single
wavelength.wavelength.
5. Types of Holograms
Transmission Holograms
Use 2 beam for create interference
Intensity is around 3:1 or 4:1(power per unit
area)
More setup and equipment
Reflection Holograms
Place the film between light source and
object
6. SLM
(spatial light modulator)
Lens
Cover Lay
Storage media
How Does Holographic DataHow Does Holographic Data
Storage Work?Storage Work?
Red beam
(information beam)
Reference
beam (addresing)
Recorded Hologram from interference pattern
12. DisadvantagesDisadvantages
Manufacture cost is highManufacture cost is high
Hard to establish controlsHard to establish controls
Won’t be able to locate problemWon’t be able to locate problem
Lack of materials needed to produceLack of materials needed to produce
Very powerfulVery powerful laserlaser needed forneeded for
projecting large hologramsprojecting large holograms
13. Applications of HolographyApplications of Holography
Credit cards carryCredit cards carry
monetary valuemonetary value
SupermarketSupermarket
scannersscanners
Optical ComputersOptical Computers
Used in aircraftUsed in aircraft
means improvemeans improve
design of aircraftdesign of aircraft
wings and turbinewings and turbine
bladesblades
ArtArt
Data miningData mining
14. Holography in the FutureHolography in the Future
Medical PurposesMedical Purposes
Gaming SystemsGaming Systems
Personal viewPersonal view
ComputersComputers
ArtworkArtwork
Future storage devicesFuture storage devices
used in next generationused in next generation
supercomputerssupercomputers
15. Interesting factsInteresting facts
Many different shapes and sizesMany different shapes and sizes
1 TB=one cube of sugar in future1 TB=one cube of sugar in future
Longer storage lifeLonger storage life
Only because of LASEROnly because of LASER
16. ConclusionConclusion
HVD will soon replace previousHVD will soon replace previous
DVDs.DVDs.
In today’s world, digital media isIn today’s world, digital media is
becoming more and more commonbecoming more and more common
and is requiring more storageand is requiring more storage
2200 DVD’s can fit on one 1 TB00 DVD’s can fit on one 1 TB
holographic disk wholographic disk with a fith a futureuture
capacity of 6 terabytescapacity of 6 terabytes..
17. ReferencesReferences
Wikipedia – Holographic Data Storage,Wikipedia – Holographic Data Storage,
http://en.wikipedia.org/wiki/Holographic_data_sthttp://en.wikipedia.org/wiki/Holographic_data_st
The Economist, Holographic dataThe Economist, Holographic data
storage, Jul 31, 2003,storage, Jul 31, 2003,
http://www.economist.com/node/1956881http://www.economist.com/node/1956881
Editor's Notes
The first papers on holographic storage were published in 1963 Holographic storage is using the entire medium instead of a few layers. You use 2 laser beams instead of one with one carrying the data and the other being a reference beam.
One bit at a time vs. entire page (60,000 bits) at a time. Flashes of light compared to actually burning the medium.