A phosphate-based glass with various concentrations of Yb 3+ ions was synthesized and investigated, the composition of which made it possible to obtain optically homogeneous glasses in small-volume crucibles. The set of the main spectral characteristics of the obtained glasses is determined and it is shown that the proposed matrix provides a high quantum yield of luminescence in a wide range of Yb 3+ concentrations. The effect of the content of OH groups on the decay time of the luminescence of Yb 3+ ions has been studied. Taking into account its good melting and working properties, this glass appears to be promising for creating active media for solid-state and fiber laser devices in the near infrared range.
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