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- Title
Development of Yb<sup>3+</sup>-doped oxyfluoride glass-ceramics with low OH<sup>-</sup> content containing CaF<sub>2</sub> nanocrystals for optical refrigeration.
- Authors
Krishnaiah, Kummara Venkata; Ledemi, Yannick; de Lima Filho, Elton Soares; Nemova, Galina; Messaddeq, Younes; Kashyap, Raman
- 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 SiO2 - Al2O3 - CaO - CaF2 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 2F5/2 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.
- Subjects
YTTERBIUM ions; GLASS-ceramics; LASER cooling
- Publication
Optical Engineering, 2017, Vol 56, Issue 1, p1
- ISSN
0091-3286
- Publication type
Article
- DOI
10.1117/1.OE.56.1.011103