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Holographic%20 Data%20 Storage

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  • 1. By: Angel Carrasquillo Michael Huynh Holographic Data Storage

2. Outline

  • Introduction
  • What is Holographic Data Storage?
  • How does it work?
  • The System
  • The Storage Medium
  • Recording a Hologram
  • Uses of the System
  • Pros and Cons
  • Experimental Results
  • Conclusion

3.

  • A hologram is a 3D image reproduced form a pattern of interference.
  • The Holography technique was invented in 1948 by the Hungarian Dennis Gabor
  • This technique have been evolving in the last few years.
  • It promises to be the data storing system of the future.

Introduction 4.

  • Storage system in which two beams from the same laser source are used to record data into a recording medium.
  • Stores information in the entire volume of the recording medium.
  • System that can store up to 1 terabyte of data into a 1 cm 3recording medium.

What is Holographic Data Storage? 5. How does it work?

  • Two beams come to the crystal and meet at a specific angle.
  • The beams create an interference pattern inside the crystal.
  • The pattern is recorded inside the crystal.

6. How does it work?

  • For read-out only the reference beam and the crystal areneeded.
  • Reference beamshould be at thesame angle it waswhen recorded.
  • Reference meetswith the interference patterninside the crystal and the signal beam is recreated.

7. The System

  • Basic components of the System:
    • Laser
    • Recording Medium
    • Mirrors
    • Spatial light modulator
    • Beam splitter
    • Shutters
    • Iris
    • Lenses
    • Half-wave plate

8. The System

  • Every single component had to be perfectly aligned.

9. Recording a Hologram

  • Laser beam alignment
  • Plane wave obtained through spatial filter and lens.
  • Beam splitter.
  • Signal beam to SLM
  • Reference beam remains a plane wave.
  • CCD used for detection of reconstructed hologram.

10. The Recording Medium

  • Photorefractive and Photopolymer Crystals.
  • Media parameters:
    • Diffraction efficiency
    • Holographic fidelity
    • Sensitivity
    • Dynamic range
    • Volatility.

11. The Recording Medium

  • Photorefractive Crystal: Lithium Niobate (LiNbO 3 ). Usually doped with elements such as: iron, manganese, or chromium.
  • When the crystal is doped, levels are created where electrons reside.
  • Interference pattern excites electrons to the Conduction Band.
  • Electro-optic effect.
  • Refractive index changes.

12.

  • Can be used to store any kind of information from documents to videos.
  • Will be useful for:
    • Governments
    • Libraries
    • Businesses
    • People

Uses of the System 13. Pros and Cons

  • Pros:
    • Storage capacity
      • High Density
      • Small Volume
    • Effective
      • Rapid Data Rate
      • Fast Access Times
    • Swift searching
  • Cons:
    • Sensitive
    • Material Limitations
    • Noise
    • Cost

14.

  • Our setup consisted of:
  • -Laser-Iris
  • -Half-waveplate -Beam splitter
  • -Spatial light modulator -Reflecting mirror
  • -Focal lens 90 mm -Power detector

The Setup SF Crystal (LiNbO3: Fe ) FL90 Iris 2 BS 2 Laser DET 15. Experimental Results 16. Noise

    • Caused by:
    • Temperature
    • Loud Sounds
    • Movement
    • Light

17. Experimental Results 18.

  • Holographic Data Storage is a convenient and effective way of data storage.

Conclusion 19. Questions ?

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