S. V. Firstov, A. V. Shubin, V. F. Khopin, M. A. Mel'kumov, I. A. Bufetov, O. I. Medvedkov, A. N. Gur'yanov, E. M. Dianov, “Bismuth-doped germanosilicate fibre laser with 20-W output power at 1460 nm”, Kvantovaya Elektronika, 2011, Volume 41, Number 7,Pages <nobr>581

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Letters

Bismuth-doped germanosilicate fibre laser with 20-W output power at 1460 nm

S. V. Firstov^a, A. V. Shubin^a, V. F. Khopin^b, M. A. Mel'kumov^a, I. A. Bufetov^a, O. I. Medvedkov^a, A. N. Gur'yanov^b, E. M. Dianov^a

^a Fiber Optics Research Center of the Russian Academy of Sciences, Moscow
^b Institute of Chemistry of High-Purity Substances RAS, Nizhnii Novgorod

Abstract: We report the first cw bismuth — germanium codoped silica fibre laser with an output power above 20 W at 1460 nm and 50% optical efficiency. The laser operates on a transition between energy levels of bismuth-related active centres associated with silicon. The incorporation of a small amount (~5 mol %) of germanium into the core of bismuth-doped silica fibre has little effect on its luminescence spectrum but reduces optical losses, which limit the laser efficiency.

PACS: 42.55.Wd, 42.60.Lh, 32.50.+d

Received: 15.06.2011