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Anti-Stokes fluorescence cooling in Yb-doped ZBLAN fibers at atmospheric pressure: experiments and near-future prospects
Author(s): Jenny M. Knall; Arushi Arora; Martin Bernier; Michel Digonnet
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Paper Abstract

We report for the first time cooling by anti-Stokes fluorescence (ASF) of a single-mode fiber, and cooling of a fiber at atmospheric pressure. This demonstration and the ability of our model to accurately predict cooling are crucial steps towards the development of radiation-balanced fiber lasers and were the primary focus of this work. We also experimentally investigated the effects of pump power and wavelength, the core size, and the dopant concentration on ASF cooling, in order to maximize this process. Experiments were performed on two Yb-doped ZBLAN fiber from Le Verre Fluoré: a single-mode fiber doped with 1 mol% Yb and a multimode fiber doped with 3 mol% Yb. The maximum temperature change achieved in the two fibers was -5.2 mK and -0.64 K, respectively, confirming that cooling scales with doped area. However, we also discuss limitations to this scaling, namely the absorptive loss, concentration quenching, and the mode profile of the pump. We use our previously reported model to quantify these scarcely reported parameters. For the multimode fiber, comparison between the experimental data and the model gave an inferred absorptive loss of 45 dB/km and a critical quenching concentration of 3.57x1027 m-3. In addition to these parameters, accurate modeling also requires precise knowledge of the absorption and emission cross-sections. To this end, we propose a method to obtain spectra that obey the McCumber relation and accurately represent the material under investigation. Finally, we report on the cooling efficiencies achieved in the single-mode (2.0%) and multimode (0.85%) fibers and show that the efficiency decreases with increasing pump power due to absorptive loss.

Paper Details

Date Published: 4 March 2019
PDF: 9 pages
Proc. SPIE 10936, Photonic Heat Engines: Science and Applications, 109360F (4 March 2019); doi: 10.1117/12.2510883
Show Author Affiliations
Jenny M. Knall, Stanford Univ. (United States)
Arushi Arora, Stanford Univ. (United States)
Martin Bernier, Univ. Laval (Canada)
Michel Digonnet, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 10936:
Photonic Heat Engines: Science and Applications
Denis V. Seletskiy; Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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