First demonstration of optical refrigeration efficiency greater than 4% at room temperature

In this work, we present the cooling efficiency of a LiYF (lithium yttrium fluoride,YLF) sample co-doped with 10at.% ytterbium (Yb ) and 0.0040at.% thulium (Tm ). For the first time at room temperature, the cooling efficiency of a sample overcomes the 4%-barrier, and it must be compared with the bes...

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Published inOptics express Vol. 28; no. 10; pp. 14476 - 14489
Main Authors Cittadino, Giovanni, Damiano, Eugenio, Di Lieto, Alberto, Tonelli, Mauro
Format Journal Article
LanguageEnglish
Published United States 11.05.2020
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Summary:In this work, we present the cooling efficiency of a LiYF (lithium yttrium fluoride,YLF) sample co-doped with 10at.% ytterbium (Yb ) and 0.0040at.% thulium (Tm ). For the first time at room temperature, the cooling efficiency of a sample overcomes the 4%-barrier, and it must be compared with the best values reported in literature, about 3%, obtained with a YLF:10at.%Yb sample. We also investigated the frequency behaviour of energy transfer mechanisms between Yb and Tm ions in order to have a better understanding of the contribution of phonons to the cooling cycle. These mechanisms can explain the cooling efficiency enhancement in the co-doped system.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.390283