Special Section on Optical Refrigeration and Radiation-Balanced Lasers

Development of Yb3+-doped oxyfluoride glass-ceramics with low OH content containing CaF2 nanocrystals for optical refrigeration

[+] Author Affiliations
Kummara Venkata Krishnaiah, Elton Soares de Lima Filho

Polytechnique de Montréal, Department of Engineering Physics, P.O. Box 6079, Station Centre-ville, Montréal, Québec H3C 3A7, Canada

Université Laval, Centre d’Optique, Photonique et Laser, 2375 Rue de la Terrasse, Québec G1V 0A6, Canada

Yannick Ledemi, Younes Messaddeq

Université Laval, Centre d’Optique, Photonique et Laser, 2375 Rue de la Terrasse, Québec G1V 0A6, Canada

Galina Nemova

Polytechnique de Montréal, Department of Engineering Physics, P.O. Box 6079, Station Centre-ville, Montréal, Québec H3C 3A7, Canada

Raman Kashyap

Polytechnique de Montréal, Department of Engineering Physics, P.O. Box 6079, Station Centre-ville, Montréal, Québec H3C 3A7, Canada

Polytechnique de Montréal, Department of Electrical Engineering, P.O. Box 6079, Station Centre-ville, Montréal, Québec H3C 3A7, Canada

Opt. Eng. 56(1), 011103 (Aug 31, 2016). doi:10.1117/1.OE.56.1.011103
History: Received May 15, 2016; Accepted August 1, 2016
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Abstract.  Oxyfluoride glasses and glass-ceramics (GCs) have some niche advantages over other oxide and fluoride glasses, as they possess combined properties. This paper reports the structural, thermal, and photoluminescence (PL) properties of Yb3+-doped SiO2Al2O3CaOCaF2 oxyfluoride glasses and transparent GCs containing CaF2 nanocrystals. Special efforts were undertaken to minimize the hydroxyl (OH) content in the prepared samples to improve their optical features. Differential scanning calorimetry analyses were performed to determine the characteristic temperatures of the base glasses. X-ray diffractometry studies have confirmed the fluorite CaF2 nanocrystals to be 10 nm in size. Reduced transparency in the ultraviolet (UV)–visible to the near-infrared (NIR) regions was observed for the GCs compared to the base glass with increasing thermal treatment temperature. A higher PL intensity upon 920-nm excitation was obtained in the GCs compared to that of the base glass. The absolute photoluminescence quantum yield upon 920-nm laser excitation was evaluated using an integrating sphere and an optical spectrum analyzer. It was observed that the lifetime of the F5/22 level of the Yb3+ ions decreases with increasing ceramization temperature. The potential advantages of using such oxyfluoride GCs over commonly studied single crystals for laser cooling applications are discussed.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Kummara Venkata Krishnaiah ; Yannick Ledemi ; Elton Soares de Lima Filho ; Galina Nemova ; Younes Messaddeq, et al.
"Development of Yb3+-doped oxyfluoride glass-ceramics with low OH content containing CaF2 nanocrystals for optical refrigeration", Opt. Eng. 56(1), 011103 (Aug 31, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011103


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