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Radiation-Balanced Silica Fiber Amplifier
Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA..
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
Univ Laval, Ctr Opt Photon & Laser COPL, Quebec City, PQ G1V 0A6, Canada..
Univ Laval, Ctr Opt Photon & Laser COPL, Quebec City, PQ G1V 0A6, Canada..
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2021 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 127, no 1, article id 013903Article in journal (Refereed) Published
Abstract [en]

We report what we believe to be the first radiation-balanced fiber amplifier-a device that provides optical gain while experiencing no temperature rise. The gain medium is a silica fiber with a 21-mu m-diameter core highly doped with Yb3+ (2.52 wt. %) and codoped with 2.00 wt. % Al to reduce concentration quenching. The amplifier is core pumped with 1040-nm light to create anti-Stokes fluorescence cooling and gain in the core at 1064 nm. Using a custom slow-light fiber Bragg grating sensor with mK resolution, temperature measurements are performed at multiple locations along the amplifier fiber. A 4.35-m fiber pumped with 2.62 W produced 17 dB of gain, while the average fiber temperature remained slightly below room temperature. This advancement is a fundamental step toward the creation of ultrastable lasers necessary to many applications, especially low-noise sensing and high-precision metrology.

Place, publisher, year, edition, pages
2021. Vol. 127, no 1, article id 013903
National Category
Physical Sciences Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-42748DOI: 10.1103/PhysRevLett.127.013903ISI: 000669567100009PubMedID: 34270319Scopus ID: 2-s2.0-85109208671OAI: oai:DiVA.org:miun-42748DiVA, id: diva2:1583886
Available from: 2021-08-10 Created: 2021-08-10 Last updated: 2021-08-10Bibliographically approved

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Engholm, Magnus

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