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

Qiang Gao, Raymond K Kostuk

Research output: Contribution to journalArticle

33 Citations (Scopus)

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
StatePublished - Jul 10 1997

Fingerprint

Digital storage
digital data
data storage
Masks
masks
Signal to noise ratio
signal to noise ratios
Holograms
recording
Scattering
interference
Data storage equipment
profiles
scattering

Keywords

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

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Improvement to holographic digital data-storage systems with random and pseudorandom phase masks. / Gao, Qiang; Kostuk, Raymond K.

In: Applied Optics, Vol. 36, No. 20, 10.07.1997, p. 4853-4861.

Research output: Contribution to journalArticle

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