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Cryogenically cooled erbium-doped fiber lasers

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Abstract

Experiments on core- and cladding-pumped Er-doped fiber lasers demonstrate that the output power more than double when they are cooled from room temperature to liquid-nitrogen temperature, reaching 95 mW and 1.21 W for core and cladding-pumping fiber lasers respectively in the “eye-safe” emission band around 1.6 μm. The results are explained in terms of the spectroscopy of Er at lower temperature, which gets closer to the outstanding spectroscopy of Yb:silica.

© 2011 Optical Society of America

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