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Proceedings Paper

Preparation of high-purity LiF, YF3, and YbF3 for laser refrigeration
Author(s): Markus P. Hehlen; William L. Boncher; Seth D. Melgaard; Michael W. Blair; Robert A. Jackson; Thomas E. Littleford; Steven P. Love
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Paper Abstract

The role of transition-metal impurities in Yb3+-doped YLiF4 (YLF) laser-cooling crystals is studied. Divalent 3d transition-metal ions, in particular Fe2+, are found to have strong absorptions at the laser cooling pump wavelength and degrade the cooling efficiency by introducing background absorption. A set of eight substitutional and chargecompensated defects that form upon introduction of 1+, 2+, and 3+ transition-metal ions into the YLF crystal lattice is proposed. A calculation of solution energies for each defect type and for a range of 3d ions is carried out. It indicates that divalent 3d ions preferentially substitute for Y3+ accompanied by a fluoride vacancy for charge compensation. An electron paramagnetic resonance (EPR) study of a YLF crystal identifies Fe2+ in the crystal lattice, in agreement with the elemental analysis and the computational results. A strategy for purifying the YF3, LiF, and YbF3 starting materials for the YLF:Yb crystal growth is discussed. Chelate-assisted solvent extraction purification with pyrrolidine dithiocarbamate (APDC) for Y, Li, and Yb as well as ethylenediaminetetraacetic acid (EDTA) for Li was carried out.

Paper Details

Date Published: 19 February 2014
PDF: 11 pages
Proc. SPIE 9000, Laser Refrigeration of Solids VII, 900004 (19 February 2014); doi: 10.1117/12.2039547
Show Author Affiliations
Markus P. Hehlen, Los Alamos National Lab. (United States)
William L. Boncher, Los Alamos National Lab. (United States)
Seth D. Melgaard, Air Force Research Lab. (United States)
Michael W. Blair, Los Alamos National Lab. (United States)
Robert A. Jackson, Keele Univ. (United Kingdom)
Thomas E. Littleford, Keele Univ. (United Kingdom)
Steven P. Love, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 9000:
Laser Refrigeration of Solids VII
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)

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