Abstract
After the first Bi-doped fiber laser was demonstrated in 2005 [1], impressive progress in Bi-doped fiber lasers took place. Their power reached tens of watts and the tuning range (1.15-1.55µm) covered practically all the emission band. Despite the big progress in fiber lasers the nature of the IR emitting centers is not clear. Numerous contradicting hypotheses ascribe the IR luminescence to Bi5+, Bi1+, Bi0 separate ions, to various clusters of bismuth ions or to Bi-associated color centers.
© 2011 Optical Society of America
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