Holographic%20 Data%20 Storage
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Holographic%20 Data%20 Storage






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Holographic%20 Data%20 Storage Holographic%20 Data%20 Storage Presentation Transcript

  • By: Angel Carrasquillo Michael Huynh Holographic Data Storage
  • 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
    • 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.
    • 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 3 recording medium.
    What is Holographic Data Storage?
  • 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.
  • How does it work?
    • For read-out only the reference beam and the crystal are needed.
    • Reference beam should be at the same angle it was when recorded.
    • Reference meets with the interference pattern inside the crystal and the signal beam is recreated.
  • The System
    • Basic components of the System:
      • Laser
      • Recording Medium
      • Mirrors
      • Spatial light modulator
      • Beam splitter
      • Shutters
      • Iris
      • Lenses
      • Half-wave plate
  • The System
    • Every single component had to be perfectly aligned.
  • 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.
  • The Recording Medium
    • Photorefractive and Photopolymer Crystals.
    • Media parameters:
      • Diffraction efficiency
      • Holographic fidelity
      • Sensitivity
      • Dynamic range
      • Volatility.
  • 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.
    • 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
  • 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
    • 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 λ 2 BS λ 2 Laser DET
  • Experimental Results
  • Noise
      • Caused by:
      • Temperature
      • Loud Sounds
      • Movement
      • Light
  • Experimental Results
    • Holographic Data Storage is a convenient and effective way of data storage.
  • Questions ?