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Proceedings Paper

Structural and optical characterizations of Yb3+ doped GeO2-PbF2-PbO glass-ceramics for optical refrigeration
Author(s): Lauro J. Q. Maia; Jyothis Thomas; Kummara V. Krishnaiah; Yannick Ledemi; Denis Seletskiy; Younès Messaddeq; Raman Kashyap
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Paper 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 2F5/22F7/2 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.

Paper Details

Date Published: 22 February 2018
PDF: 8 pages
Proc. SPIE 10550, Optical and Electronic Cooling of Solids III, 105500O (22 February 2018); doi: 10.1117/12.2314234
Show Author Affiliations
Lauro J. Q. Maia, Univ. Federal de Goiás (Brazil)
École Polytechnique de Montréal (Canada)
Jyothis Thomas, École Polytechnique de Montréal (Canada)
Kummara V. Krishnaiah, École Polytechnique de Montréal (Canada)
Yannick Ledemi, Ctr. d'Optique, Photonique et Laser (Canada)
Denis Seletskiy, École Polytechnique de Montréal (Canada)
Younès Messaddeq, Ctr. d'Optique, Photonique et Laser (Canada)
Raman Kashyap, École Polytechnique de Montréal (Canada)

Published in SPIE Proceedings Vol. 10550:
Optical and Electronic Cooling of Solids III
Richard I. Epstein; Denis V. Seletskiy; Mansoor Sheik-Bahae, Editor(s)

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