High-beam quality, high-efficiency laser based on fiber with heavily Yb(3+)-doped phosphate core and silica cladding

We have fabricated and tested a composite fiber with an Yb(3+)-doped phosphate glass core and silica cladding. Oscillation with a slope efficiency of 74% was achieved using core pumping at 976 nm with fiber lengths of 48-90 mm in a simple laser configuration, where the cavity was formed by a high-re...

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Bibliographic Details
Published in:Optics letters 2015-08, Vol.40 (16), p.3762-3765
Main Authors: Egorova, O N, Semjonov, S L, Medvedkov, O I, Astapovich, M S, Okhrimchuk, A G, Galagan, B I, Denker, B I, Sverchkov, S E, Dianov, E M
Format: Article
Language:English
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Summary:We have fabricated and tested a composite fiber with an Yb(3+)-doped phosphate glass core and silica cladding. Oscillation with a slope efficiency of 74% was achieved using core pumping at 976 nm with fiber lengths of 48-90 mm in a simple laser configuration, where the cavity was formed by a high-reflectivity Bragg grating and the cleaved fiber end. The measured M(2) factors were as low as 1.05-1.22 even though the fiber was multimode at the lasing wavelength.
ISSN:1539-4794
DOI:10.1364/OL.40.003762