19 February 2014 Preparation of high-purity LiF, YF3, and YbF3 for laser refrigeration
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Proceedings Volume 9000, Laser Refrigeration of Solids VII; 900004 (2014) https://doi.org/10.1117/12.2039547
Event: SPIE OPTO, 2014, San Francisco, California, United States
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.
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Markus P. Hehlen, Markus P. Hehlen, William L. Boncher, William L. Boncher, Seth D. Melgaard, Seth D. Melgaard, Michael W. Blair, Michael W. Blair, Robert A. Jackson, Robert A. Jackson, Thomas E. Littleford, Thomas E. Littleford, Steven P. Love, Steven P. Love, "Preparation of high-purity LiF, YF3, and YbF3 for laser refrigeration", Proc. SPIE 9000, Laser Refrigeration of Solids VII, 900004 (19 February 2014); doi: 10.1117/12.2039547; https://doi.org/10.1117/12.2039547

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