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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 24 — Aug. 20, 2009
  • pp: 4676–4682

Reversal of degradation of information masks in lithium niobate

Daniel Sando, Esa Jaatinen, and Fabrice Devaux  »View Author Affiliations

Applied Optics, Vol. 48, Issue 24, pp. 4676-4682 (2009)

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We report on the reversal of degradation of information masks stored in self-defocusing lithium niobate. After a long writing time, the image degradation appears as the splitting of refractive-index patterns stored in the medium. The reversal is achieved simply by illuminating the crystal with incoherent light from a halogen lamp. The reversal occurs because the refractive-index changes responsible for the splitting are of a smaller magnitude and are therefore erased first during incoherent illumination. Additionally, we gain insight into the storage, degradation, and erasure dynamics using a time- dependent numerical model of the photorefractive effect in this medium. Since the data can be recovered from a degraded state in which the original data are unrecognizable, this technique could be utilized in such applications as image scrambling or encryption.

© 2009 Optical Society of America

OCIS Codes
(160.3730) Materials : Lithium niobate
(160.5320) Materials : Photorefractive materials
(190.5330) Nonlinear optics : Photorefractive optics
(210.4770) Optical data storage : Optical recording

ToC Category:
Nonlinear Optics

Original Manuscript: April 29, 2009
Revised Manuscript: July 24, 2009
Manuscript Accepted: July 24, 2009
Published: August 11, 2009

Daniel Sando, Esa Jaatinen, and Fabrice Devaux, "Reversal of degradation of information masks in lithium niobate," Appl. Opt. 48, 4676-4682 (2009)

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