Influence of other rare earth ions on the optical refrigeration efficiency in Yb:YLF crystals

We investigated the effect of rare earth impurities on the cooling efficiency of Yb³⁺:LiYF₄ (Yb:YLF). The refrigeration performance of two single crystals, doped with 5%-at. Yb and with identical history but with different amount of contaminations, have been compared by measuring the cooling efficie...

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Published inOptics express Vol. 22; no. 23; pp. 28572 - 28583
Main Authors Di Lieto, Alberto, Sottile, Alberto, Volpi, Azzurra, Zhang, Zhonghan, Seletskiy, Denis V, Tonelli, Mauro
Format Journal Article
LanguageEnglish
Published United States 17.11.2014
Subjects
Crystallization
Energy Transfer
Fluorides - chemistry
Ions
Lithium Compounds - chemistry
Models, Theoretical
Optical Phenomena
Refrigeration
Spectrometry, Fluorescence
Spectroscopy, Near-Infrared
Ytterbium - chemistry
Yttrium - chemistry
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Summary:We investigated the effect of rare earth impurities on the cooling efficiency of Yb³⁺:LiYF₄ (Yb:YLF). The refrigeration performance of two single crystals, doped with 5%-at. Yb and with identical history but with different amount of contaminations, have been compared by measuring the cooling efficiency curves. Spectroscopic and elemental analyses of the samples have been carried out to identify the contaminants, to quantify their concentrations and to understand their effect on the cooling efficiencies. A model of energy transfer processes between Yb and other rare earth ions is suggested, identifying Erbium and Holmium as elements that produce a detrimental effect on the cooling performance.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.028572