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Measuring photorefractive trap density without the electro-optic effect.

R M Pierce1, R S Cudney, G D Bacher

  • 1Department of Physics, University of Southern California, University Park, Los Angeles, California 90089-0484, USA.

Optics Letters
|September 22, 2009
PubMed
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Optical beam coupling in photorefractive crystals occurs via modulated absorption, not the electro-optic effect. This study quantifies trap density in barium titanate using these charge-rearrangement gratings.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Photorefractive crystals are key optical materials.
  • Beam coupling typically relies on the electro-optic effect.

Purpose of the Study:

  • Investigate a novel beam coupling mechanism in photorefractive crystals.
  • Determine the effective photorefractive trap density of barium titanate.

Main Methods:

  • Utilized spatially modulated absorption for beam coupling.
  • Employed charge rearrangement gratings for analysis.
  • Measured trap density in barium titanate crystals.

Main Results:

  • Demonstrated optical beam coupling without electro-optic modulation.
  • Established a method to characterize photorefractive properties.

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Optical Trapping of Nanoparticles
13:39

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Published on: January 15, 2013

  • Quantified effective trap density in barium titanate.

    • Conclusions:

    • Spatially modulated absorption provides an alternative mechanism for photorefractive beam coupling.
    • The method accurately determines effective photorefractive trap density.
    • Barium titanate crystals exhibit specific trap density characteristics.