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# INTRODUCTION TO HOLOGRAPHY

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hieee guyes this slide give you basic info. about holography..

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• Nice Presentation! Would have been better if mathematical model were in the slides. Mathematical Model gives the better understanding of how we record complex amplitude of light (amplitude and phase) using interference of two mutually coherent light beams

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• 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.
• ### INTRODUCTION TO HOLOGRAPHY

1. 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. 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. 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. 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. 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. 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
7. 7. Recording data processRecording data process