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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.
Ho-Pui Ho,Wing-Wai Wong,Shu-Yuen Wu, andEdwin Y. B. Pun
"Multilayer optical storage disk based on the frequency up-conversion effect from rare-Earth ions", Proc. SPIE 4645, Rare-Earth-Doped Materials and Devices VI, (5 April 2002); https://doi.org/10.1117/12.461651
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Ho-Pui Ho, Wing-Wai Wong, Shu-Yuen Wu, Edwin Y. B. Pun, "Multilayer optical storage disk based on the frequency up-conversion effect from rare-Earth ions," Proc. SPIE 4645, Rare-Earth-Doped Materials and Devices VI, (5 April 2002); https://doi.org/10.1117/12.461651