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 1032011-2012

Hologram HistoryHologram History

Hologram is from theHologram is from the

Greek word holosGreek word holos

Theory Developed in 1947 by British scientist Theory Developed in 1947 by British scientist Dr.Dennis Gabor(Nobel prize winner )Dr.Dennis Gabor(Nobel prize winner )

Developed because he was trying to improve Developed because he was trying to improve the resolution of electron microscopesthe resolution of electron microscopes

HolographyHolography Holography is a method Holography is a method of recording patterns of of recording patterns of lightlight to to produce a three-dimensional object.produce a three-dimensional object.

Hologram Hologram : : The recorded patterns of The recorded patterns of light are called a hologramlight are called a hologram

The process is accomplished by using The process is accomplished by using two laser beams, instead of one, to two laser beams, instead of one, to read and write data to the disk.read and write data to the disk.

Coherent LightCoherent Light

Development in this field was Development in this field was stifled during the 1950’s because stifled during the 1950’s because light sources were not coherent.light sources were not coherent.

Coherent light is light that is Coherent light is light that is monochromatic and of a single monochromatic and of a single wavelength.wavelength.

Types of HologramsTransmission 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

SLM(spatial light modulator)

Lens

Cover Lay

Storage media

How Does Holographic Data How Does Holographic Data Storage Work?Storage Work?

Red beam(information beam)

Referencebeam (addresing)

Recorded Hologram from interference pattern

Recording data processRecording data process

Reading dataReading data

Why Is It So Fast?Why Is It So Fast?

COMPARISIONCOMPARISION

Hard coating no yes yes

AdvantagesAdvantages

3-D recording3-D recording Increase storage capacityIncrease storage capacity Increase read/write speed Increase read/write speed Faster recording & reading Faster recording & reading

than a CD/DVDthan a CD/DVD Stores 3.9 TBStores 3.9 TB Can’t lose dataCan’t lose data securitysecurity

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 powerful Very powerful laserlaser needed for needed forprojecting large holograms projecting large holograms

Applications of HolographyApplications of Holography

Credit cards carry Credit cards carry monetary valuemonetary value

Supermarket Supermarket scannersscanners

Optical Computers Optical Computers

Used in aircraft Used in aircraft means improve means improve design of aircraft design of aircraft wings and turbine wings and turbine bladesblades

ArtArt

Data miningData mining

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 generation used in next generation

supercomputerssupercomputers

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

ConclusionConclusion HVD will soon replace previous HVD will soon replace previous

DVDs.DVDs. In today’s world, digital media is In today’s world, digital media is

becoming more and more common becoming more and more common and is requiring more storageand is requiring more storage

2200 DVD’s can fit on one 1 TB 00 DVD’s can fit on one 1 TB holographic disk wholographic disk with a fith a future uture capacity of 6 terabytescapacity of 6 terabytes..

ReferencesReferences Wikipedia – Holographic Data Wikipedia – Holographic Data Storage, Storage, http://en.wikipedia.org/wiki/Holographic_data_storageThe Economist, Holographic data The Economist, Holographic data storage, Jul 31, 2003, storage, Jul 31, 2003, http://www.economist.com/node/1956881