Investigation of Dy³⁺/Tm³⁺ co-doped ZrF₄-BaF₂-YF₃-AlF₃ fluoride glass for efficient 2.9 μm mid-infrared laser applications

Abstract

Different doping concentrations of Dy³⁺/Tm³⁺ in ZrF₄-BaF₂-YF₃-AlF₃ (ZBYA) fluoride glass samples were prepared by the melt-quenching method. Spectroscopic properties were analyzed through absorption (from 200 to 3300 nm) and emission spectra (from 1200 to 3200 nm). The spontaneous radiative transition probability, branching ratio and radiative lifetime of various energy levels transition were calculated based on the Judd-Ofelt theory. The emission cross-section value of the 1 mol% Dy³⁺/1 mol% Tm³⁺ co-doped ZBYA sample at 2.9 μm were calculated as 3.79×10^-21 cm². Near- and mid-IR emission spectra of Dy³⁺/Tm³⁺ co-doped ZBYA-fluoride glass under the excitation of 808 nm laser diode were investigated and discussed. Analysis of the emission spectra and the energy transition process of Dy³⁺/Tm³⁺ co-doped glass indicated that the introduction of Tm³⁺ ions can effectively improve the mid-infrared fluorescence intensity of Dy³⁺ ions, thus the Dy³⁺/Tm³⁺ co-doped ZBYA-fluoride glass can be an excellent candidate material for 2.9 μm mid-infrared laser applications.

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Identifiers

ORCID for Gilberto Brambilla: orcid.org/0000-0002-5730-0499

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