Study of the Twophoton Photorefractive Effect in Lithium Niobate,

Abstract

The dynamics and wavelength dependence of recording and optical erasure of thick phase gratings produced photorefractively were studied in undoped and in iron-doped lithium niobate. Properties of gratings formed at high incident power densities via two-photon absorption were compared with those of gratings formed at shorter wavelengths by the usual one-photon mechanism. Gratings formed by the two-photon mechanism in undoped crystals exhibit a distinctive two-exponential time dependence of optical erasure not observed in other circumstances. This shows that the nature of final trap states, as well as absorption and charge transfer characteristics, is important in controlling photorefractive sensitivity. A method was discovered for producing high diffraction efficiency gratings at infrared frequencies in titanium-diffused optical waveguides on lithium niobate. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Oct 26, 1981
Accession Number
ADA107493

Entities

People

  • Carl M. Verber
  • Nile F. Hartman
  • Rand C. Sherman
  • Van E. Wood

Organizations

  • Battelle Memorial Institute

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Charge Transfer
  • Data Processing
  • Holograms
  • Lithium
  • Lithium Niobates
  • Long Wavelengths
  • Materials
  • Military Research
  • Niobates
  • Optical Absorption
  • Optical Modulators
  • Optical Properties
  • Optical Waveguides
  • Piezoceramics
  • Two Photon Absorption
  • Waveguides

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Optical Physics and Photonics.