Impact of Yb2+ on the anti-Stokes fluorescence cooling performance of Yb-doped silica fibers

To unlock the full potential of laser-cooled silica optical fibers, a better understanding of the internal mechanisms of heat generation is required. This work explores ytterbium-doped aluminosilicate fibers produced via industry-standard modified chemical vapor deposition (MCVD) techniques with var...

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Bibliographic Details
Published in:Optical materials express 2024-08, Vol.14 (8), p.2095
Main Authors: Meehan, Bailey, Pietros, Alexander R, Chen, Chun-Wei, Hawkins, Thomas W, Engholm, Magnus, Dragic, Peter D, Digonnet, Michel J F, Ballato, John
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Chemical vapor deposition
Doped fibers
Fiber lasers
Fluorescence
Heat generation
Laser beam heating
Laser cooling
Optical fibers
Quantum efficiency
Quenching
Silicon dioxide
Ytterbium
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Summary:To unlock the full potential of laser-cooled silica optical fibers, a better understanding of the internal mechanisms of heat generation is required. This work explores ytterbium-doped aluminosilicate fibers produced via industry-standard modified chemical vapor deposition (MCVD) techniques with varied levels of divalent ytterbium to determine their effect on anti-Stokes fluorescence thermal performance. The inclusion of Yb2+ is shown to have a significant negative impact on cooling potential. Yb2+ ions are shown to correlate with heat generation by two distinct mechanisms, absorption and quenching of active Yb3+ ions. This excess heating represents a reduction in quantum efficiency that is detrimental to Yb-doped fiber lasers and amplifiers beyond the laser-cooling application.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.531172