Enhancement Mechanism Of The Near-and Mid-infrared Emission Of Oxyfluoride Glass With Reduced Hydroxyl Content By Chemical Clarifier

In recent years,with the rapid development of laser technology,near-and mid-infrared lasers have been widely used in environmental monitoring,laser radar,infrared remote sensing,minimally invasive surgery,and optical fiber communication.The laser gain medium is the core part of the laser,and the rare-earth-doped glass material is one of the most important gains medium materials,but the water molecules or hydroxyl groups in the glass matrix will seriously weaken the infrared luminescence,which will reduce the power of the infrared laser.To solve this problem,this paper aims to reduce the hydroxyl content in the glass matrix and explore the mechanism of enhancing the near-and mid-infrared luminescence properties of the glass matrix by introducing chemical clarifier and using the combined action of physical and chemical methods.In Yb³⁺/Tm³⁺co-doped oxyfluorosilicate glasses ceramics,the main research is the effects of introducing different contents of high-temperature clarifier Ca SO₄ to replace Ca O on the hydroxyl content of glass matrix and near-and mid-infrared emission intensity.Phase analysis showed that the introduction of Ca SO₄ did not change the microstructure of the glass.The results of FTIR transmission spectroscopy and infrared fluorescence spectroscopy show,after the introduction of Ca SO₄,sulfate ions decomposed to produce gas and free oxygen,resulting in the gradual decrease of OH^-content in the glass matrix,and the hydroxyl absorption coefficientα^-_OHdecreased from 1.618 cm^-1 to 0.869 cm^-1,the infrared emission intensity has been enhanced as a whole,and its intensity value first increases and then decreases.When the content of Ca SO₄ is 0.6 mol%,the hydroxyl content in the glass matrix is the least,and the infrared luminescence intensity reaches the maximum.The optical gain performance analysis shows that the emission cross section of the glass sample is0.71×10^-20cm²,the larger emission cross section shows that the glass sample has better optical properties due to the introduction of sulfate ions,which can be better applied in optical gain dielectric materials.In addition,the glass sample has a positive gain when the inversion particle number P>0.2,indicating that the glass substrate can theoretically achieve laser pulse output at 1.8μm under low energy pumping.In the oxyfluorotellurite glasses doped with Er³⁺ions,the main research is the effects of the introduction of low-temperature clarifier Zn S with different contents to replace Zn O on the hydroxyl content in the glass matrix and the near and mid-infrared luminescence intensity were mainly explored.The results of phase analysis showed that the microstructure of the glass sample did not change.Through FTIR transmission spectrum and infrared fluorescence spectrum analysis,it is found that after the introduction of Zn S,the decomposition of sulfur ions produces gases and free oxygen,which leads to the decrease of OH^-content in glass samples,and the infrared luminescence intensity is significantly enhanced as a whole,and its intensity value increases first and then decreases.When the content of Zn S is 2 mol%,the hydroxyl removal effect is the best,the hydroxyl absorption coefficient is reduced to0.576 cm^-1,and the infrared luminescence intensity reaches the maximum.The optical gain performance analysis shows that the emission cross sections of the glass samples at 1.53μm and 2.75μm are 0.475×10^-20cm² and 0.598×10^-20cm²,respectively,indicating that this glass matrix can obtain large emission cross sections,which is beneficial to its application in optical gain medium materials.