Development of Long Lifetime Photorefractive Crystals for Holographic Data Storage

Abstract

The lifetime of thermally fixed photorefractive holograms in iron doped lithium niobate was investigated. A prescription for material preparation and fixing technique was developed that enables a thermally fixed hologram to be recorded in Fe-doped LiNbO3 with high diffraction efficiency and long lifetime. In particular, a hologram with a fixed photorefractive index modulation of ^10(exp -3) and a 100 year lifetime at room temperature is predicted. A lithium niobate crystal was processed according to the prescription and a thermally fixed hologram was recorded at high temperature. The projected lifetime of the hologram at 25 deg C was shown to be ^110 years.

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Document Details

Document Type
Technical Report
Publication Date
Apr 30, 1998
Accession Number
ADA358233

Entities

People

  • Anthony S. Kewitsch
  • George A. Rakuljic

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Charge Carriers
  • Conductivity
  • Data Storage Systems
  • Diffraction
  • Efficiency
  • Heat Of Activation
  • High Temperature
  • Holograms
  • Lithium
  • Lithium Niobates
  • Materials
  • Modulation
  • Photorefractive Materials
  • Piezoceramics
  • Relaxation Time
  • Space Charge

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Thermal Physics or Thermal Science.