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19 February 2014 Effect of impurities on cooling efficiency in fluoride crystals
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Proceedings Volume 9000, Laser Refrigeration of Solids VII; 900003 (2014)
Event: SPIE OPTO, 2014, San Francisco, California, United States
We present a characterization of the optical refrigeration properties of two 5% Ytterbium-doped YLF crystals. Measurements showed different cooling efficiencies for the samples, despite the same concentration of dopant. We carried out a spectroscopic study on the crystals devoted to the identification of foreign contaminants inside them. These searches determined the presence of Erbium and Holmium impurities in both the cooling samples. We attributed the reduction of the cooling efficiency in one of the crystals to an increased amount of these contaminants.
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Alberto Di Lieto, Alberto Sottile, Azzurra Volpi, Zhonghan Zhang, and Mauro Tonelli "Effect of impurities on cooling efficiency in fluoride crystals", Proc. SPIE 9000, Laser Refrigeration of Solids VII, 900003 (19 February 2014);

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