Near-diffraction-limited operation of step-index large-mode-area fiber lasers via gain filtering

We present, for the first time to our knowledge, an explicit experimental comparison of beam quality in conventional and confined-gain multimode fiber lasers. In the conventional fiber laser, beam quality degrades with increasing output power. In the confined-gain fiber laser, the beam quality is go...

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Bibliographic Details
Published in:Optics letters 2010-06, Vol.35 (11), p.1828-1830
Main Authors: MARCIANTE, John R, ROIDES, Richard G, SHKUNOV, Vladimir V, ROCKWELL, David A
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fiber lasers
Fundamental areas of phenomenology (including applications)
Lasers
Optics
Physics
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Summary:We present, for the first time to our knowledge, an explicit experimental comparison of beam quality in conventional and confined-gain multimode fiber lasers. In the conventional fiber laser, beam quality degrades with increasing output power. In the confined-gain fiber laser, the beam quality is good and does not degrade with output power. Gain filtering of higher-order modes in 28microm diameter core fiber lasers is demonstrated with a beam quality of M(2)=1.3 at all pumping levels. Theoretical modeling is shown to agree well with experimentally observed trends.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.35.001828