Improvement to holographic digital data-storage systems with random and pseudorandom phase masks

Qiang Gao, Raymond Kostuk

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Various effects associated with using a random phase mask in holographic data storage are analyzed. It is shown that the nonlinear nature of recording a phase hologram coupled with the highly nonuniform profile of the object beam is the major source of interpixel cross talk. It is also shown that, although the nonlinear effects are reduced by an increase in the reference-to-object beam ratio, the scattering noise is increased. Thus an optimal beam ratio must be used to maximize the signal-to-noise ratio. It is demonstrated as well that the interpixel interference noise can be suppressed effectively by use of a multilevel pseudorandom phase mask, which also significantly reduces the nonlinear noise. These findings are supported by experimental results that show the signal-to-noise ratio and efficiency are improved significantly by use of a six-level pseudorandom phase mask.

Original languageEnglish (US)
Pages (from-to)4853-4861
Number of pages9
JournalApplied optics
Volume36
Issue number20
DOIs
StatePublished - Jul 10 1997

Keywords

  • Holographic data storage
  • Pseudorandom phase mask
  • Random phase mask

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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