Preparetion Of Rare-earth Ions Doped Fluoroindate Glass And Study On The 3 μm Emission Properties

Lasers operating at around 3μm have important applications in basic scientific research,environmental detection,biomedicine treatment and national defense security.By using rare earth ion doped ZBLAN（ZrF₄-BaF₂-LaF₃-AlF₃-NaF）glass fiber as the gain medium,³μm laser output of tens of watts has been achieved.However,rare earth ions have low luminescence efficiency in this band.Exploring methods to improve the luminous efficiency of rare-earth ions is helpful to further improve the performance of 3μm fiber lasers.In this paper,fluoroindate glass with low phonon energy was selected as the substrate material.The preparation of fluoroindate glasses doped with Ho³⁺and Ho³⁺/Pr³⁺and their luminescence properties in the 3μm were systematically studied.The research results were listed as follows:1.The influence of the doping concentration of Ho³⁺on the luminescence performance of fluoroindate glass at 3μm was studied.Under the protective atmosphere of dry nitrogen,a series of Ho³⁺-doped fluoroindate glasses（InF₃-BaF₂-ZnF₂-GaF₃-PbF₂-SrF₂-YF₃-LaF₃-LiF,IZGP）were prepared by melt-quenching method.The hydroxyl absorption coefficient of the prepared IZGP glass at 3μm was⁰.002 cm^-1.Under the excitation of 1120 nm laser,strong³μm luminescence were observed in Ho³⁺-doped IZGP glass.Compared with ZBLAN glass,the luminescence intensity was significantly enhanced.2.The influence of the doping concentration of Pr³⁺on the luminescence performance of Ho³⁺-doped IZGP glass in the 3μm was studied.Under the protective atmosphere of dry nitrogen,a series of Ho³⁺/Pr³⁺co-doped IZGP glasses were prepared by melt-quenching method.Under the excitation of 1120 nm laser,with the increase of Pr³⁺doping concentration,the luminescence intensity of²μm gradually decreased,and the luminescence intensity of³μm increased first and then decreased.When the doping concentration of Pr³⁺was 0.03 mol%,the luminescence intensity of³μm was the strongest.The introduction of Pr³⁺can reduce the population of Ho³⁺ion ⁵I₇ level（³μm laser lower energy level）,which can be used to improve the performance of Ho³⁺-doped 3μm fiber laser.