Design,Fabrication And Performance Optimization Of Se-based Multispectral Glasses

In recent years,the infrared?IR?technology plays an important role in national defense,space technology and modern economic construction.With the strong growth of the infrared market and the field of application widened,the demand for multispectral materials that are transparent from the visible to the far-IRspectral band continues to grow.As a kind of multispectral materials,chalcohalide glasses can not only meet the excellent performance in the infrared regions,but also extend their transmission spectralinto part of the visible waveband.Their adjustable performance with the component change,wide transmission spectral and low costare received increasingly attention from scientific researchers and manufacturers.In this thesis,a series of Ge-In?Ga?-Se-CsBr,Ge-Ga-In-Se-CsBr,Ge-Ga-Se-RbBr system glasses are firstly prepared,and the physical,thermal and optical properties are studied and discussed by means of using the instrument test,numerical calculation of curve fitting and other auxiliary methods.The 60 GeSe₂-25Ga₂Se₃-15 CsBr component is selected as candidates for the preparation of large size glass samples,looking for excellent and low-cost multispectral glass materials.In the first chapter,the multispectral materials and the chalcogenide glassareintroduced.Their development process and research status are summarized.Finally,the research contents,methods,purpose and significance of the thesisis presented.In chapter 2,several common properties of Se-based multispectral chalcohalide glasses,such as the characteristicsof glass and optical propertiesareintroduced.And then,the theoretical foundation of the performance parameters calculation used in this work arealso briefly reviewed.Chapter 3 introduces the experimental methods of Se-based multispectral chalcohalide glasses,including the traditional preparation technologyand parameters measurements,such as physical,thermal and optical parameters.Chapter 4 investigates the compositionof multispectral chalcohalide glasses.The properties of Ge-In-Se-CsBr and Ge-Ga-In-Se-CsBr are studied and analyzed,respectively.The results show that the Ga-doped glass has advantages in both cost and performances,including physicalparameters,thermal stability and optical parameters.Therefore,Ge-Ga-Seglass system isselected to prepare large-size?at least?30diameter?multispectral glasses.In chapter 5,a series of GeSe₂-Ga₂Se₃-CsBr chalcohalide glasses??9?are prepared,and the physical,thermal and optical properties are studied and discussed by means of instrumentation and numerical calculation.The results is indicativeof the glass system exhibits good stability of thermal and broad transimitted spectrum and satisfies the design requirements of its three transmissionwindows.By optimizing the design,the 60 GeSe₂-25Ga₂Se₃-15 CsBr component is selected as candidate for the preparation of large size multispectral glasses.Based on the traditional melt-quenching technique and a new purification process,the high-quality 60 GeSe₂-25Ga₂Se₃-15 CsBr chalcogenide glasses with ?30 diameter arefabricated.In chapter 6,the new kind of alkali halide,RbBr,is introduced into the Ge-Ga-Se system,and a novel GeSe₂-Ga₂Se₃-RbBr ternary system is prepared,which fills the research gap for chalcohalide glassescontaining Rb,and the forming region of the GeSe₂-Ga₂Se₃-RbBr system isfirst reported.Moreover,the main physical,thermal and optical parameters of the glassesaremeasured and discussed,whichlaid the foundationfor the application of such glasses.In the last chapter,the main research results of the studyare summarized,and the need for improvementof the work in the future research are also proposed.