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Laser cooling in a silica optical fiber at atmospheric pressure
Stanford University, Stanford, CA, United States.
Stanford University, Stanford, CA, United States.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
University of Illinois at Urbana-Champaign, Urbana, IL, United States.
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2020 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 45, no 5, p. 1092-1095Article in journal (Refereed) Published
Abstract [en]

For the first time, to the best of our knowledge, laser cooling is reported in a silica optical fiber. The fiber has a 21-μm diameter core doped with 2.06 wt.% YbM3+ and co-doped with Al2O3 and F- to increase the critical quenching concentration by a factor of 16 over the largest reported values for the Yb-doped silica. Using a custom slow-light fiber Bragg grating sensor, temperature changes up to -50 mK were measured with 0.33 W/m of absorbed pump power per unit length at 1040 nm. The measured dependencies of the temperature change on the pump power and the pump wavelength are in excellent agreement with predictions from an existing model, and they reflect the fiber's groundbreaking quality for the radiation-balanced fiber lasers. 

Place, publisher, year, edition, pages
2020. Vol. 45, no 5, p. 1092-1095
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-38655DOI: 10.1364/OL.384658Scopus ID: 2-s2.0-85080105843OAI: oai:DiVA.org:miun-38655DiVA, id: diva2:1414854
Available from: 2020-03-16 Created: 2020-03-16 Last updated: 2020-03-16Bibliographically approved

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Engholm, Magnus

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