Multi-layer optical storage disc based on the frequency up-conversion effect from rare-earth ions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)156-164
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2002


TitleRare-Earth-Doped Materials and Devices VI
PlaceUnited States
CitySan Jose, CA
Period23 - 24 January 2002


The application of frequency up-conversion in rare earth (Ho3+ and Yb3+) co-doped glasses for optical storage has been investigated. Optical discs with the storage layer made from rare-earth doped tellurite glasses have been studied in terms of minimum bit-size and up-conversion efficiency. The possibility of multi-layered architecture has also been investigated. The choice of using tellurite glasses is based on previous experimental results indicating this type of materials gives extremely high up-conversion efficiency. Since the up-conversion effect is dependent on the square of the intensity of the pump beam, it is possible that the 'effective' spot size of the signal region can be a significantly smaller than that limited by diffraction, hence leading to super-resolution in the storage layer and increased storage density.

Research Area(s)

  • Frequency up-conversion, Holmium, Multi-layered optical storage, Rare-earth ions, Tellurite glass, Ytterbium

Citation Format(s)