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Polychromatic reconstruction for volume holographic memory.

Ryushi Fujimura1, Tsutomu Shimura, Kazuo Kuroda

  • 1Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. fujimura@iis.u-tokyo.ac.jp

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|July 3, 2007
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Summary

We developed a new method to reconstruct images from volume holograms using different wavelengths. Using broadband light allows for a full image reconstruction, unlike single-wavelength methods.

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Area of Science:

  • Optics and Photonics
  • Holography
  • Image Reconstruction

Background:

  • Volume holograms store information in 3D.
  • Reconstructing holograms typically requires the same wavelength used for recording.

Purpose of the Study:

  • To propose and demonstrate a method for reconstructing images from volume holograms using a different wavelength than the recording one.
  • To investigate the use of spectrally broad light for hologram reconstruction.

Main Methods:

  • Utilizing spectrally broad, spatially coherent light as a probe beam.
  • Exploiting Bragg matching of angular spectral components at specific wavelengths within the broadband spectrum.

Main Results:

  • Successful reconstruction of a whole image using polychromatic light.
  • Partial image reconstruction observed when using single-mode laser light.
  • Demonstrated the feasibility of wavelength-mismatched holographic image reconstruction.

Conclusions:

  • Polychromatic light enables complete image reconstruction from volume holograms at different wavelengths.
  • The bandwidth of the probe beam is critical for successful reconstruction.
  • Further analysis is needed on image deformation in wavelength-mismatched reconstruction.