Oxides doped with rare-earth ions as a recording medium with multiple rewriting

Vladislav I. Zimenko; Viacheslav V. Petrov; Vasyliy G. Kravets; Vasily V. Motuz; Alexander V. Prygun; N. E. Yanchuk

doi:10.1117/12.267731

28 February 1997 Oxides doped with rare-earth ions as a recording medium with multiple rewriting

Vladislav I. Zimenko, Viacheslav V. Petrov, Vasyliy G. Kravets, Vasily V. Motuz, Alexander V. Prygun, N. E. Yanchuk

Proceedings Volume 3055, International Conference on Optical Storage, Imaging, and Transmission of Information; (1997) https://doi.org/10.1117/12.267731
Event: International Conference on Optical Storage, 1996, Kiev, Ukraine

Abstract

The optical memory on materials having the properties of electron trapping is a new direction at development of information storage and rewrite. Currently are pursued investigations directed on creation of a new type recording medium with the opportunity of information rewrite by optical methods as well as a medium for heteroassociative memory in optical neural systems. Primarily as such medium are used alkaline-earth metal sulphides activated by two rare-earth elements. When creating the memory on materials with electron trapping on the basis of alkaline-earth sulphides there arises a number of difficulties: (1) these materials are chemically unstable, especially they are subject to the action of water vapors; (2) films prepared by electron-beam evaporation technique have a polycrystalline structure with grain sizes in the order of 20 nm what has an essential influence on the signal-to-noise ratio at information reading. The main objective which is pursued by us consists in investigating the optical properties of new synthesized materials having the electron trapping properties which are characterized by chemical stability and are easy manufacture at preparation of amorphous structures. We have also recommended to use CaO (MgO) doped with Eu, Sm. It has known, that the optical stimulated luminescence (OSL) obtains in CaO. But OSL appears in the special prepared structures with defects. For this aim there are some methods: thermochemical reduction or radiation processing by electron beam. Besides that the OSL obtains only by nitrogen temperature (77 K).

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Vladislav I. Zimenko, Viacheslav V. Petrov, Vasyliy G. Kravets, Vasily V. Motuz, Alexander V. Prygun, and N. E. Yanchuk "Oxides doped with rare-earth ions as a recording medium with multiple rewriting", Proc. SPIE 3055, International Conference on Optical Storage, Imaging, and Transmission of Information, (28 February 1997); https://doi.org/10.1117/12.267731

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