Generating high-quality beam in a multimode LD-pumped all-fiber Raman laser

We report on the first demonstration of an all-fiber CW Raman laser based on a multimode graded-index fiber directly pumped by multimode fiber-coupled laser diodes. A joint action of Raman clean-up effect and mode-selection properties of special fiber Bragg gratings inscribed in the central part of...

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Bibliographic Details
Published in:Optics express 2017-05, Vol.25 (11), p.12581-12587
Main Authors: Zlobina, Ekaterina A, Kablukov, Sergey I, Wolf, Alexey A, Nemov, Ilya N, Dostovalov, Alexander V, Tyrtyshnyy, Valentin A, Myasnikov, Daniil V, Babin, Sergey A
Format: Article
Language:English
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Summary:We report on the first demonstration of an all-fiber CW Raman laser based on a multimode graded-index fiber directly pumped by multimode fiber-coupled laser diodes. A joint action of Raman clean-up effect and mode-selection properties of special fiber Bragg gratings inscribed in the central part of the graded-index fiber core, results in high-efficiency conversion of a multimode (M ~26) pump at 915 nm into a high-quality (M ~2.6) output beam at 954 nm. About 50 W output power has been obtained with slope efficiency of 67%. The proposed development and integration of key multimode fiber technologies opens the door to new type of LD-pumped high-power high-beam-quality fiber lasers that may operate at almost any wavelength defined by available LDs.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.012581