E 115 hw 5

E 115 hw 5 - Ryan Owings E115 071 15 October 2007 Hardware...

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Ryan Owings E115 071 15 October 2007 Hardware Topics Holographic data storage Holographic data storage uses laser beams to shine on photorefractive material to capture data. Two coherent beams split from one to create holograms. One beam being the reference beam and the other is the signal beam. When these two beams interfere with each other a pattern is made in which both amplitude and phase information is encoded inside. When the interference is meet with the photorefractive material, the patterns are engraved inside the material. The hologram causes the light to be redirected the same way the initial beam is rebuilt when the reference beam enlightens the material. The two laser beams go through a complicated process in which a chemical reaction occurs, but is begun when the data is recorded into the signal beam, using a spatial light modulator device, a hologram is formed. This allows the data to be arranged in an order similar to a checkerboard of one million bits. The hologram is then recorded in a storage medium when
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E 115 hw 5 - Ryan Owings E115 071 15 October 2007 Hardware...

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