Preparation And Properties Of Dy³⁺ Doped GeS₂·Ga₂S₃·CdI₂ Glasses And Fibers

Mid-infrared lasers have many applications in chemical sensing,medical diagnostics,imaging,national defense,etc,which have bright prospect.Fiber laser with advantages of compact,reliable,continuous-wave operated MIR lasers and low cost is one of the most practical value and significant research.Chalcogenide and chalcohalide glasses is promising materials for the MIR lasers because they possess quite low phonon energy and high refractive indices?Find a chalcogenide or a chalcohalide glass gathering the merits of high solubility of RE ions,low transmission loss,high emission efficiency,high working temperature,and suitable thermos mechanical properties for fiber drawing is a challenging and significant work.Based on the previous work,in this work,we chose the Dy³⁺-doped64GeS₂·16Ga₂S₃·20CdI₂ chalcohalide glasses as research objects,investigated its optical properties of by transmission and absorption spectra,MIR fluorescence spectra and fluorescence lifetime spectra.The raw materials were distilled and TeCl₄were added to react with hydration impurities,the concentrations of hydration impurities have an obvious decrease after the dehydration process.The glasses doped with 4000 ppm Dy³⁺ions were successfully drawn into core-only fibers with a diameter of 210?m without microcrystal formation inside.The main conclusions are as follow:?1?Absorption spectra at near-infrared indicated that GGC glasses doped with2000³0000 ppm of Dy³⁺ions have good RE solubility.?2?Judd-Ofelt analyses were performed based on the absorption spectra,larger Judd-Ofelt intensity parameters?₂and long fluorescence lifetimes show perfect fluorescence properties at MIR.?3?There are large impurity absorption peaks in infrared transmission spectrum,and the variation trend of fluorescence spectrum indicating that the dominant factor of non-radiative decay rates is the energy transfer process between hydration impurities and excited state electrons.?4?Concentration quenching of the MIR emissions was not significant when doped with 2000⁶000 ppm Dy³⁺ions in terms of the results of fluorescence lifetimes.The glass doped with as high as 0.4%Dy³⁺ions showed the best properties.?5?The process of remove impurities can completely remove the carbon containing impurities,effectively decrease hydration impurities,but the decomposition of TeCl₄ will reduced its effect of dehydration.?6?The glass doped with as high as 4000 ppm Dy³⁺ions shows superior fiber drawing stability and can be drawn into fibers with good optical quality,and single mode optical fiber with a core cladding structure can be prepared by easily adjusting the refractive index.