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Development of ytterbium-doped oxyfluoride glasses for laser cooling applications

Kummara Venkata Krishnaiah, Elton Soares de Lima Filho, Yannick Ledemi, Galina Nemova, Younes Messaddeq and Raman Kashyap

Article (2016)

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Cite this document: Krishnaiah, K. V., Soares de Lima Filho, E., Ledemi, Y., Nemova, G., Messaddeq, Y. & Kashyap, R. (2016). Development of ytterbium-doped oxyfluoride glasses for laser cooling applications. Scientific Reports, 6, p. 1-12. doi:10.1038/srep21905
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Abstract

Oxyfluoride glasses doped with 2, 5, 8, 12, 16 and 20 mol% of ytterbium (Yb3+) ions have been prepared by the conventional melt-quenching technique. Their optical, thermal and thermo-mechanical properties were characterized. Luminescence intensity at 1020 nm under laser excitation at 920 nm decreases with increasing Yb3+ concentration, suggesting a decrease in the photoluminescence quantum yield (PLQY). The PLQY of the samples was measured with an integrating sphere using an absolute method. The highest PLQY was found to be 0.99(11) for the 2 mol% Yb3+: glass and decreases with increasing Yb3+ concentration. The mean fluorescence wavelength and background absorption of the samples were also evaluated. Upconversion luminescence under 975 nm laser excitation was observed and attributed to the presence of Tm3+ and Er3+ ions which exist as impurity traces with YbF3 starting powder. Decay curves for the Yb3+: F-2(5/2)-> F-2(7/2) transition exhibit single exponential behavior for all the samples, although lifetime decrease was observed for the excited level of Yb3+ with increasing Yb3+ concentration. Also observed are an increase in the PLQY and a slight decrease in lifetime with increasing the pump power. Finally, the potential of these oxyfluoride glasses with high PLQY and low background absorption for laser cooling applications is discussed.

Open Access document in PolyPublie
Subjects: 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
3100 Physique > 3100 Physique
3100 Physique > 3111 Laser
3100 Physique > 3112 Photonique
Department: Département de génie électrique
Département de génie physique
Research Center: Non applicable
Funders: CRSNG/NSERC, Canadian Excellence Research Chair program (CERC) on Enabling Photonic Innovations for Information and Communication, Council for the Art's Killam Research Fellowships program, Government of Canada's Canada Research Chairs program, Fonds de recherche du Québec--Nature et technologies, Canada Foundation for Innovation
Date Deposited: 06 Dec 2018 12:51
Last Modified: 07 Dec 2018 01:20
PolyPublie URL: https://publications.polymtl.ca/3520/
Document issued by the official publisher
Journal Title: Scientific Reports (vol. 6)
Publisher: Nature Research
Official URL: https://doi.org/10.1038/srep21905

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