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Opt Lett. 2010 Jun 1;35(11):1828-30. doi: 10.1364/OL.35.001828.

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

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University of Rochester, Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1299, USA.


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.

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