München 2004 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 24: Photonik in komplexen und periodischen Strukturen
Q 24.4: Vortrag
Dienstag, 23. März 2004, 17:15–17:30, HS 204
Y2O3 and (Lu/Sc)2O3 thin films grown by thermal evaporation on α-Al2O3 — •Lutz Rabisch, Sebastian Bär, and Günter Huber — Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
α-Al2O3 is an approved material in optical technology. Efficient laser operation in rare-earth doped Y2O3 has been demonstrated. Layer systems of both materials combine the crystal properties and enable the fabrication of crystalline coatings and active and passive waveguides.
We report on the growth of Eu:Y2O3- and Eu:(Lu/Sc)2O3 thin films (2-500 nm) on α-AL2O3 by electron beam evaporation. The crystal structure of the films was analysed by XRD and Surface XRD. The measurements reveal polycrystalline growth of the Y2O3 films on an initially amorphous interfacial layer. In contrast the (Lu/Sc)2O3 films show polycrystalline growth with an obvious epitaxial texture.
Emission spectra reveal that the local symmetry of the Eu centers within the (Lu/Sc)2O3 films is identical to the bulk material whereas the Y2O3 films have slightly modified spectra. All films thinner then roughly 10 nm show broadened emission lines. In contrast the fluorescence of a 3 nm Eu:Y2O3 film buried under an Al2O3 coating layer is identical to the bulk spectrum.