Abstract

Broadband long-lived near-infrared (NIR) luminescence of Bi-doped glasses was discovered in the beginning of XXI century [1]. Working range of the Bi-doped fiber lasers and amplifiers currently covers NIR spectral region from 1140-1775 nm with efficiency up to 60% [2]. Despite the practical results the nature of the observed NIR luminescence is still under debates. After thorough research on the Bi-doped aluminosilicate glasses, <Bi-O> distances obtained by EXAFS [3] lead the authors to conclude that Bi5+ is responsible for the observed luminescence. Today it is quite accepted, that reducing synthesis conditions are necessary to create Bi-optical centers emitting in NIR [4].

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