Abstract
Excited-state absorption (ESA) in various bismuth-doped fibers (BDFs) was investigated. No significant ESA in IR emission bands of Bi-doped germanosilicate and phosphosilicate fibers was found. Considerable ESA was observed in Bi-doped aluminosilicate fibers at 800-1700nm. The ESA spectra of the aluminosilicate BDFs with different bismuth concentration were measured at room and 77K temperature. Significant dependence of the ESA on the bismuth concentration and the fiber temperature was found.
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