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Multilayer CaF 2 epitaxial structures, selectively doped with Eu 2+ and Sm 2+ were grown on Si(1 1 1) by molecular-beam epitaxy. We investigate excitation transfer both within a single codoped layer and between two separated layers doped with Eu 2+ and Sm 2+ , respectively. We use the tripled output of a Q-switched YAG: Nd 3+ laser to selectively excite...
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