An Approach To Integrated Waveguide-Hologram Memory

Toshiaki Suhara; Hiroshi Nishihara; Jiro Koyama

doi:10.1117/12.957218

26 July 1979 An Approach To Integrated Waveguide-Hologram Memory

Toshiaki Suhara, Hiroshi Nishihara, Jiro Koyama

Proceedings Volume 0176, Guided Wave Optical Systems and Devices II; (1979) https://doi.org/10.1117/12.957218
Event: Technical Symposium East, 1979, Washington, D.C., United States

Abstract

An approach toward constructing an integrated waveguide-hologram memory is presented. The fundamental unit of the device, which is cascadable for integration, is a combination of a small waveguide hologram and an optical switch of deflection type which enables the selective read-out of the hologram. The waveguide hologram was recorded by using an Arion laser in an amorphous As2S3 (recording layer) / Ti-diffused LiNbO3 (slab waveguide) structure, which was designed for deriving high diffraction efficiency. The stored pictorial information was successfully read out by the it light of a He-Ne laser satisfying the propagation constant matching condition for the aberration-free imaging. The optical switch must be compact and capable of controlling a guided wave having a large width required for reconstructing a two-dimentional image with sufficient resolution. The design considerations are described of an electrooptic TIR switch in which an effective-index gap is formed by high-index cladding to obtain a large separation angle. It was found and experimentally confirmed that the switch has an appropriate performance, although the component size and the switching ratio must be traded off. The detailed imaging and switching characteristics are presented and the feasibility of the memory is discussed.

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Toshiaki Suhara, Hiroshi Nishihara, and Jiro Koyama "An Approach To Integrated Waveguide-Hologram Memory", Proc. SPIE 0176, Guided Wave Optical Systems and Devices II, (26 July 1979); https://doi.org/10.1117/12.957218

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KEYWORDS

Waveguides

Holograms

Switches

3D image reconstruction

Switching

Electro optics

Optical switching

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