The Fabrication And CO₂ Laser Power Delivery Characteristics Of Ge-Sb-Se Glass Fibers

In recent years,with the development of infrared laser technology,all kinds of special optical fiber used for delivery infrared laser in industrial laser processing,laser medical and military application had become more and more widely.In order to make the fibers could satisfy different situation for laser delivery applications,in the past forty years people had researched different materials and structures of infrared optical fibers.On the basis of optical fiber materials,the types of optical fibers mainly include: polycrystalline silver halide fiber,chalcogenide glass fiber,fluoride glass fiber,sapphire fiber,Ag/AgI hollow glass,etc.Chalcogenide glass fibers have the advantages of wide infrared transmission spectrum,excellent chemical stability,deliquescence,low manufacturing cost,high production efficiency and goodoptical fiber flexibility.It can transport many kinds of infrared signal and infrared laser with low power.It could be widely used for remote infrared spectrum analysis of liquid,solid,atmosphere and the chemical composition of the specific gases,infrared measuring temperature and cryogenic temperature measurement,medical surgery,and industrial processing,etc.Abroad in the field of infrared chalcogenide glass fiber delivery laser power had conducted a lot of research work,made a series of progress.Almost no research reports in this field in China.In this paper,the environmentally friendly Ge-Sb-Se chalcogenide with low content of impurities was prepared through melting first.Their physical,chemical,thermal,and optical properties had been measured.Ge₂₀Sb₁₅Se₆₅ components identified to be the optimize composition.Drawn out bare fiber with different core diameters,explored laser power delivery characteristics under the CW CO₂ laser irradiation.The content of this paper is listed as follows:In the first chapter,we mainly introduce the chalcogenide glass fiber and other typical infrared optical fibers' classification and characteristics,and introduce the advantages of chalcogenide glass fibers as infrared fiber delivery laser.Describe the process of chalcogenide glass fibers used for infrared laser power delivery in international.Analyze the shorts of previous research.Then we proposed the purposes ?contents and significance of this study.The second chapter is the theoretical basis,mainly introduced the basic theory of glass,the thermal stability characteristics,the damage mechanism of optical materials,under the radiation of continuous laser,laser and optical fiber coupling conditions.The third chapter is the experiment part,mainly introduced the preparation experiment process of chalcogenide glass and optical fiber,and its performance testing methods,including chalcogenide glass optical and thermal properties test,optical fiber end face test,optical loss measuring,etc.The fourth chapter is the Ge-Sb-Se chalcogenide glass fiber composition optimization.Selected and prepared two groups of Ge-Sb-Se chalcogenide glass series.The infrared spectrum,crystallization and thermal properties were tested to determine the best glass composition is Ge₂₀Sb₁₅Se₆₅.The fifth chapter explored the characteristics of Ge-Sb-Se chalcogenide glass fibers delivery infrared laser power.Build the experimental device for fibers to delivery 10.6 ?m CO₂ laser.Used different fiber core diameter Ge-Sb-Se chalcogenide fibers to delivery CO₂ laser and discussed the relationship between optical fiber core diameter and the power of transmission laser.Fiber end face damage morphology and damage mechanism analysis were discussed in the final.The sixth chapter is the conclusion,summarized the results of this paper,as well as disadvantages.