Holmium fibre laser with record quantum efficiency

Authors :: Kurkov, Andrei S
Sholokhov, E M
Tsvetkov, V B
Marakulin, A V
Minashina, L A
Medvedkov, O I
Kosolapov, A F
Source :: Quantum Electronics; June 2011, Vol. 41 Issue: 6 p492-494, 3p
Publication Year :: 2011
Abstract: We report holmium-doped fibre lasers with a Ho3+ concentration of 1.6 x 1019 cm-3 and lasing wavelengths of 2.02, 2.05, 2.07 and 2.1 um at a pump wavelength of 1.15 um. The slope efficiency of the lasers has been measured. The maximum efficiency, 0.455, has been obtained at a lasing wavelength of 2.05 um. The laser efficiency is influenced by both the optical loss in the wing of a vibrational absorption band of silica and active-ion clustering.

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