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Proceedings Paper

Ultrapure ZBLAN glass for optical refrigerators
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Paper Abstract

A quantitative description of optical refrigeration in Yb3+-doped ZBLAN glass in the presence of transition-metal and OH impurities is presented. The model includes the competition of radiative processes with energy migration, energy transfer to transition-metal ions, and multiphonon relaxation. The cooling efficiency is sensitive to the presence of both 3d metal ions with absorption in the near infrared and high-frequency vibrational impurities such as OH. The calculation establishes maximum impurity concentrations for different operating temperatures and finds Cu2+, Fe2+, Co2+, Ni2+, and OH to be the most problematic species. Cu2+ in particular has to be reduced to <2 ppb, and Fe2+, Co2+, Ni2+, and OH have to be reduced to 10-100 ppb for a practical ZBLAN:Yb3+ optical cryocooler to operate at 100-150 K.

Paper Details

Date Published: 7 March 2007
PDF: 6 pages
Proc. SPIE 6461, Laser Cooling of Solids, 646103 (7 March 2007); doi: 10.1117/12.708304
Show Author Affiliations
Markus P. Hehlen, Los Alamos National Lab. (United States)
Richard I. Epstein, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 6461:
Laser Cooling of Solids
Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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