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Proceedings Paper

Synthesis and evaluation of ultra-pure rare-earth-doped glass for laser refrigeration
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Paper Abstract

Significant progress has been made in synthesizing and characterizing ultra-pure, rare-earth-doped ZIBLAN (ZrF4-InF3- BaF2-LaF3-AlF3-NaF) glass capable of laser refrigeration. Yb3+-doped ZIBLAN glass was produced from fluoride precursors which were individually purified by solvent extraction and subsequently treated with hydrofluoric gas at elevated temperatures to remove oxygen impurities. We have developed two-band differential luminescence thermometry (TBDLT) as a new non-invasive, spectroscopic technique to evaluate the intrinsic quality of Yb3+ doped laser-cooling samples. TBDLT measures changes in the local temperature upon laser excitation via the small changes in the 2F5/22F7/2 fluorescence spectrum. Two commercial band pass filters in combination with a balanced dual InGaAs photodetector are used to select and integrate regions of interest in the fluorescence spectrum with sub-millisecond resolution. The TBDLT technique successfully finds the zero-crossing temperature (ZCT), which is the minimum temperature to which a Yb3+ doped sample can cool, independent of surface heating. ZCT is a useful measure for the presence of impurities and the overall quality of the laser-cooling material. Favorable laser cooling results were obtained for several 1% Yb3+-doped glasses with varying degrees of purity.

Paper Details

Date Published: 12 February 2009
PDF: 10 pages
Proc. SPIE 7228, Laser Refrigeration of Solids II, 72280C (12 February 2009); doi: 10.1117/12.811914
Show Author Affiliations
Wendy M. Patterson, The Univ. of New Mexico (United States)
Markus P. Hehlen, Los Alamos National Lab. (United States)
Mansoor Sheik-Bahae, The Univ. of New Mexico (United States)
Richard I. Epstein, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 7228:
Laser Refrigeration of Solids II
Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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