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7 March 2007 Single fluoride crystals as materials for laser cooling applications
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We report the successful growth and the laser cooling results of Yb3+-doped single fluoride crystals. By investigating the mechanical and thermal properties of Yb-doped BaY2F8 and LiYF4 crystals and using the spectroscopic data we collected from our samples, the theoretical and experimental cooling efficiency of fluoride crystals are evaluated and compared with respect to those of ZBLAN. Two different methods, a thermal camera and a fluorescence intensity ratio technique, have been used to monitor the temperature change of the samples. The temperature change is clearly exponential, as expected from theory, and the temperature drops are 6.3 K and 4 K for Yb:LiYF4 and Yb:BaY2F8 respectively in single-pass configuration, corresponding to a cooling efficiency of about 2% and 3%. This last value is slightly larger than that observed in Yb-ZBLAN in similar experimental condition.
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Stefano Bigotta, Alberto Di Lieto, Daniela Parisi, Alessandra Toncelli, and Mauro Tonelli "Single fluoride crystals as materials for laser cooling applications", Proc. SPIE 6461, Laser Cooling of Solids, 64610E (7 March 2007);

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