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Secondary grating formation by readout at Bragg-null incidence.

A Adibi1, J Mumbru, K Wagner

  • 1Department of Electrical Engineering, Pasadena, California 91125, USA.

Applied Optics
|March 8, 2008
PubMed
Summary

Reading dynamic holograms at Bragg nulls creates secondary gratings, altering selectivity. This unintended recording can cause significant cross talk in multiplexed holograms, especially with high diffraction efficiencies.

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Area of Science:

  • Holography
  • Optical data storage
  • Photorefractive materials

Background:

  • Holographic data storage relies on recording and retrieving information using holograms.
  • Multiplexing techniques increase data capacity but can introduce cross talk.
  • Dynamic holograms and Bragg selectivity are key concepts in holographic storage.

Purpose of the Study:

  • To investigate the impact of reading dynamic holograms at Bragg nulls on grating recording.
  • To analyze the formation of secondary gratings and their effect on selectivity curves.
  • To evaluate the resulting cross talk in multiplexed holographic systems.

Main Methods:

  • Recording dynamic holograms in a suitable medium.
  • Illuminating the recorded hologram at the Bragg null angles.
  • Analyzing the diffracted beams and the formation of secondary gratings.
  • Experimentally verifying the predicted effects on selectivity and cross talk.

Main Results:

  • Illumination at Bragg nulls leads to the recording of two secondary gratings.
  • These secondary gratings modify the selectivity curve of the original hologram.
  • The effect causes significant cross talk, potentially exceeding interpage cross talk in specific multiplexing scenarios.

Conclusions:

  • Dynamic hologram readout at Bragg nulls introduces an artifactual grating recording.
  • This artifact can degrade the performance of multiplexed holographic storage systems.
  • Careful consideration of readout conditions is necessary to minimize unwanted cross talk.