1–5 ?m Near-and Mid-infrared Emission Properties Of Oxyfluorotellurite Glasses

With the continuous development of infrared laser technology,the 1?5?m infrared lasers have been widely used in the fields of national defense,communication,environmental monitoring and medical treatment.The infrared glass and optical fiber materials are currently crucial laser gain media which are necessary to achieve infrared laser output.In this paper,we focus on the research about 1–5?m near-and mid-infrared emission property of Te O₂-Zn F₂ oxyfluorotellurite glasses doped withIn the low doping concentration range,the infrared luminescent property of Nd³⁺doped 60Te O₂-40Zn F₂ oxyfluorotellurite glasses was researched.The infrared fluorescence emission at 0.89,1.06 and 1.33?m can be realized under the excitation of 808 nm LD.The emission intensity is obviously enhanced with the increase ofIn the low doping concentration range,the infrared luminescent property of Tm³⁺doped 60Te O₂-40Zn F₂ oxyfluorotellurite glasses was researched.The infrared fluorescence emission at 1.46,1.8 and 3.77?m can be achieved under the excitation of 808 nm LD.The emission intensity is obviously enhanced with the increase of doping concentration.However,due to the cross relaxation process of[³H₄,³H₆]?when the concentration of Tm³⁺is 1 mol%.The maximum values of emission cross With the increase of doping concentration,the radiative quantum efficiency for Tm³⁺:³F₄?³H₆ and ³H₅?³F₄ transitions decreases significantly,which can be mainly considered as reabsorption among rare earth ions in high-concentration doping.For Ho³⁺/Yb³⁺codoped oxyfluorotellurite glasses,the influence of Zn F₂ content on the infrared luminescent property of the glasses was primarily researched,and the structure as well as other related properties was analyzed.The infrared fluorescence emission at 1.2,2.0,2.85,3.9,4.1?m can be realized in these glasses under the excitation of 980 nm LD.The emission intensity is enhanced significantly with the?⁵I₈,⁵I₇?⁵I₈,⁵I₆?⁵I₇ and ⁵I₅?⁵I₆ transitions are 0.639,0.760,0.985 and two-phonon assisted process and the energy transfer coefficient C _DA increases with Te O₂-Zn F₂ oxyfluorotellurite glasses possess good thermal stability,low phonon energy(about 600 cm^-1)and hydroxyl content,high infrared transmittance?about70?80%?and wide infrared transmission band?infrared cut-off wavelength over 6?m?.