Holographic memory


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Holographic memory

  1. 1. 1/30/2015 1 RENJITH PS Shashwat Shriparv dwivedishashwat@gmail.com InfinitySoft
  2. 2. 21/30/2015  Holographic memory is a technology that can store information at high density inside crystals or photopolymers.  The advantage of this type of data storage is that the volume of the recording media is used instead of just the surface .
  3. 3. 31/30/2015 Technical aspects  Like other media, holographic media is divided into write once and rewritable media .  Rewritable holographic storage can be achieved via the photorefractive effect in crystals
  4. 4. 41/30/2015  Mutually coherent light from two sources creates an interference pattern in the media. These two sources are called the reference beam and the signal beam
  5. 5. 51/30/2015 To record on the hologram, the data in the form of electric signal is converted to optical signals by a page composer  The controller generates the address to access the desired page  This results in the exposure of a small area of the recording medium through an aperture
  6. 6. 61/30/2015  The optical output signal is directed to the exposed area by the deflector  Using this beam deflecting mechanism, the light (which carries the information) and the reference beam are made to interact
  7. 7. 71/30/2015  The interference pattern is thus recorded on the hologram. To record a different page, the aperture is moved and the above process is repeated.
  8. 8. 81/30/2015  To retrieve the information stored in a hologram, shine the reference beam directly onto the hologram. When it reflects off the hologram, it holds the light pattern of the image stored there. Then send this reconstruction beam to a CMOS sensor to recreate the original image.
  9. 9. 91/30/2015
  10. 10. 101/30/2015 ADVANTAGES  HVD offers several advantages over traditional storage technology. HVDs can ultimately store more than 2 terabyte (TB) of information -- that's 400 times more than a single-sided DVD and 40 times more than a current double-sided Blu-ray than a single-sided DVD and 20 times more than a current double-sided Blu-ray DVD
  11. 11. 111/30/2015  HVDs also use a thicker recording layer than DVDs -- an HVD stores information in almost the entire volume of the disc, instead of just a single, thin layer.  HVDs storing holograms in overlapping patterns, while a DVD basically stores bits of information side-by-side
  12. 12. 121/30/2015  The other major boost over conventional memory systems is HVD's transfer rate of up to 1 gigabyte (GB) per second -- that's 40 times faster than DVD. An HVD stores and retrieves an entire page of data, approximately 60,000 bits of information, in one pulse of light, while a DVD stores and retrieves one bit of data in one pulse of light.
  13. 13. 131/30/2015
  14. 14. 141/30/2015
  15. 15. 151/30/2015 Development and marketing  At the National Association of Broadcasters 2005 (NAB) convention in Las Vegas, conducted the first public demonstrations of the world’s first prototype of a commercial storage device at the Maxell Corporation of America booth.
  16. 16. 161/30/2015  The three main companies involved in developing holographic memory, Polaroid spinoff Aprilis, and Optware of Japan ,IBM
  17. 17. 171/30/2015 Shashwat Shriparv dwivedishashwat@gmail.com InfinitySoft