Structural and optical characterizations of Yb3+ doped GeO2-PbF2-PbO glass-ceramics for optical refrigeration

Lauro J. Q. Maia; Jyothis Thomas; Kummara V. Krishnaiah; Yannick Ledemi; Denis Seletskiy; Younès Messaddeq; Raman Kashyap

doi:10.1117/12.2314234

22 February 2018 Structural and optical characterizations of Yb³⁺ doped GeO₂-PbF₂-PbO glass-ceramics for optical refrigeration

Lauro J. Q. Maia, Jyothis Thomas, Kummara V. Krishnaiah, Yannick Ledemi, Denis Seletskiy, Younès Messaddeq, Raman Kashyap

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Proceedings Volume 10550, Optical and Electronic Cooling of Solids III; 105500O (2018) https://doi.org/10.1117/12.2314234
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

We report on the structural and optical properties of 50GeO₂-30PbF₂-(20-x)PbO-xYbF₃, with x = 0.5, 1.5, 2.0, 2.5 mol% glass-ceramics for optical refrigeration. XRD measurements reveal the formation of nanocrystals embedded in glass samples after heat treatment at 360°C ⁄ 20h. Spectroscopic measurements show that samples have near infrared photoluminescence emission due to the ²F_5/2 − ²F_7/2 Yb³⁺ transition, centered at ∼1020 nm with excitation at 919.7 nm, or 1011.2 nm, and the highest PL emission efficiency occurs for samples with 2.0 mol% of Yb³⁺. The PL quantum yield varies between 95% and 75%, depending on the lanthanide concentration and excitation wavelength, for 1.5 and 2.5 mol% Yb³⁺doped samples being the most efficient under 1011.2 nm excitation. The UV-Vis-NIR spectroscopy shows a transparency as high as 80% in the infrared region, and the absorption between 900-1050 nm increases with Yb³⁺ concentration, in good agreement with the theoretical doping levels. Preliminary measurements monitoring the sample temperature dependence using a fiber Bragg grating sensor, as a function of pump laser wavelength and Yb³⁺ concentration shows that the heating process approaches zero for an excitation wavelength of around 1030 nm, which is an indication that phonons are annihilated in these glass-ceramic materials, and shows promise for applications in optical refrigeration.

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Lauro J. Q. Maia, Jyothis Thomas, Kummara V. Krishnaiah, Yannick Ledemi, Denis Seletskiy, Younès Messaddeq, and Raman Kashyap "Structural and optical characterizations of Yb³⁺ doped GeO₂-PbF₂-PbO glass-ceramics for optical refrigeration", Proc. SPIE 10550, Optical and Electronic Cooling of Solids III, 105500O (22 February 2018); https://doi.org/10.1117/12.2314234

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