High-speed holographic read-only memory replication systems with two-wave and four-wave photorefractive amplifier

Terumasa Ito; Atsushi Okamoto; Nobuhiro Takahashi; Takayuki Sano

doi:10.1117/12.738945

11 July 2007 High-speed holographic read-only memory replication systems with two-wave and four-wave photorefractive amplifier

Terumasa Ito, Atsushi Okamoto, Nobuhiro Takahashi, Takayuki Sano

Author Affiliations +

Proceedings Volume 6620, Optical Data Storage 2007; 66201B (2007) https://doi.org/10.1117/12.738945
Event: Optical Data Storage 2007, 2007, Portland, OR, United States

Abstract

Copying speed is an important characteristic for optical read-only memory (ROM) replication systems. The copying speed of holographic ROM replication is, however, limited by small energy efficiency of the optical system due to the small diffraction efficiency of multiplexed holograms. In this paper we propose new holographic ROM replication systems with a photorefractive amplifier, and analyze the speed gain performance. We improve energy efficiency significantly and speed up replication by amplifying weak diffraction signal beams using photorefractive wave mixing. Our new theory and numerical calculations revealed that achievable speed gain can be evaluated from only a single dimensionless parameter that is the product of the three as follows: (i) the pump beam intensity ratio in the amplifier, (ii) the ratio of the photopolymer and photorefractive sensitivities, and (iii) the dynamic range per hologram of the copy medium. In current holographic recording systems, a practical copying speed gain of more than 10 is achievable with currently available photorefractive materials.

Citation Download Citation

Terumasa Ito, Atsushi Okamoto, Nobuhiro Takahashi, and Takayuki Sano "High-speed holographic read-only memory replication systems with two-wave and four-wave photorefractive amplifier", Proc. SPIE 6620, Optical Data Storage 2007, 66201B (11 July 2007); https://doi.org/10.1117/12.738945

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KEYWORDS

Holography

Holograms

Multiplexing

Diffraction

Optical amplifiers

Energy efficiency

Signal processing

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