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Experimental observation of cooling in Yb-doped silica fibers
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
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2020 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE - International Society for Optical Engineering, 2020Conference paper, Published paper (Refereed)
Abstract [en]

Anti-Stokes fluorescence cooling in a silica-based fiber is reported for the first time. The fiber had a core with a 20-μm diameter doped with 2.06 wt.% Yb and co-doped with 0.86 wt.% Al and 0.88 wt.% F. Core-pumping the fiber with 1040- nm light, temperature changes as large at -50 mK were measured at atmospheric pressure. Temperature measurements were performed at 12 pump wavelengths, and the measured dependence of the temperature change as a function of pump wavelength was in excellent agreement with a previously reported model. With this model, the absorptive loss in the fiber was inferred to be less than 15 dB/km, and the critical quenching concentration to be ∼15.6 wt.% Yb. This combination of low loss and high quenching concentration (a factor of 16 times higher than the highest reported values for Yb-doped silica) is what allowed the observation of cooling. The temperature measurements were performed at atmospheric pressure using a custom slow-light fiber Bragg grating sensor with an improved thermal contact between the test fiber and the FBG. The improved method involves isopropanol to establish a good thermal contact between the two fibers. This eliminated a source of heating and enabled more accurate measurements of the cooled-fiber temperature. This improved temperaturemeasurement set-up also led to a new cooling record in a multimode Yb-doped ZBLAN fiber at atmospheric pressure. When pumped at 1030 nm, the fiber cooled by -3.5 K, a factor of 5.4 times higher than the previous record. 

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2020.
Keywords [en]
Anti-Stokes fluorescence, Laser cooling, Optical refrigeration, Rare-earth doped fibers, Silica fibers
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:miun:diva-38962DOI: 10.1117/12.2548506Scopus ID: 2-s2.0-85083305647ISBN: 9781510633599 (print)OAI: oai:DiVA.org:miun-38962DiVA, id: diva2:1427159
Conference
Photonic Heat Engines: Science and Applications II 2020; San Francisco; United States; 5 February 2020 through 6 February 2020
Available from: 2020-04-29 Created: 2020-04-29 Last updated: 2020-04-29Bibliographically approved

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Engholm, Magnus

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