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, 56(1), 011103 (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, Venkata Krishnaiah Kummara, Yannick Ledemi, Yannick Ledemi, Elton Soares de Lima Filho, Elton Soares de Lima Filho, Galina Nemova, Galina Nemova, Younès Messaddeq, Younès Messaddeq, Raman Kashyap, 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 . Submission:

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