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

Venkata Krishnaiah Kummara; Yannick Ledemi; Elton Soares de Lima Filho; Galina Nemova; Younès Messaddeq; Raman Kashyap

doi:10.1117/1.OE.56.1.011103

31 August 2016 Development of Yb³⁺-doped oxyfluoride glass-ceramics with low OH⁻ content containing CaF₂ nanocrystals for optical refrigeration

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

Author Affiliations +

Optical Engineering, Vol. 56, Issue 1, 011103 (August 2016). https://doi.org/10.1117/1.OE.56.1.011103

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 ²F_5/2 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.

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Venkata Krishnaiah Kummara, Yannick Ledemi, Elton Soares de Lima Filho, Galina Nemova, Younès Messaddeq, and Raman Kashyap "Development of Yb³⁺-doped oxyfluoride glass-ceramics with low OH⁻ content containing CaF₂ nanocrystals for optical refrigeration," Optical Engineering 56(1), 011103 (31 August 2016). https://doi.org/10.1117/1.OE.56.1.011103

Published: 31 August 2016

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