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Photorefractive materials for nonvolatile volume holographic data storage

Hesselink1, Orlov, Liu

  • 1L. Hesselink, A. Liu, A. Akella, D. Lande, Stanford University, Stanford, CA 94305, USA. S. S. Orlov, Optitek, 1330 West Middlefield Road, Mountain View, CA 94043, USA. R. N. Neurgaonkar, Rockwell International Science Center, 1049 Camino dos.

Science (New York, N.Y.)
|November 6, 1998
PubMed
Summary

Researchers demonstrated optically gated recording for digital holographic data storage using near-stoichiometric lithium niobate. Doping enhanced sensitivity and storage stability, identifying bipolarons and small polarons as key photorefractive species.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Data Storage Technologies

Background:

  • Digital volume holographic data storage offers high density.
  • Stoichiometric lithium niobate is a promising material for holographic storage.
  • Improving sensitivity and storage stability are key challenges.

Purpose of the Study:

  • To demonstrate optically gated recording and nonvolatile readout in a digital volume holographic data storage system.
  • To enhance the sensitivity and dark storage time of holographic storage media.
  • To investigate the underlying physical mechanisms of gated recording.

Main Methods:

  • Utilizing a digital volume holographic data storage system with a pair of mutually incoherent light sources for recording and one for readout.

Related Experiment Videos

  • Employing post-growth processing of stoichiometric lithium niobate.
  • Introducing iron and manganese dopants into near-stoichiometric lithium niobate.

    • Main Results:

    • Achieved optically gated recording and nonvolatile readout.
    • Demonstrated at least a two-orders-of-magnitude improvement in sensitivity compared to previous materials.
    • Increased dark storage time and gating efficiency through iron and manganese doping.
    • Identified bipolarons and small polarons as the responsible photorefractive species.

    Conclusions:

    • Near-stoichiometric lithium niobate, with optimized doping and processing, significantly enhances holographic data storage performance.
    • The developed gating technique improves sensitivity and storage stability.
    • Understanding the role of bipolarons and small polarons is crucial for further advancements in holographic data storage.