Fabrication And Optical Properties Of High-nonlinearity Chalcogenide Glass Fibers

Chalcogenide glasses have wide-transparent infrared window,high refractive index,ultrahigh linearity and third nonlinearity,low phonon energy and the component is adjustable.Chalcogenide glass fibers combine the characteristics of the chalcogenide glasses and optical fibers as well as small volume,bendable,integration,miniaturization,etc.Chalcogenide suspended-core fibers?SCFs?prepared by high nonlinear chalcogenide glasses have higher nonlinearity than silica fiber and the traditional core-clad structure chalcogenide glass fibers.Chalcogenide SCFs also has dispersion tailoring properties and adjustable mode field area.Therefore,chalcogenide SCFs have extensive applications,such as wavelength conversion using Raman shifting,supercontinuum generation and signal regeneration,which are the most demanding features in nonlinear regime.After study on chalcogenide SCFs,we proposed an improved extrusion method for the preparation of multimaterial chalcogenide suspended-core fibers based on our tradition extrusion method.As2S3 glass was chosen as the host material of the center core and Ge20As20Se15Te45 glass was chosen as the host material of the supporting ring and bridges.We use the home-made extrusion die to prepare the multimaterial chalcogenide SCFs,then analyses the nonlinear properties of the optical fiber and study the properties of the optical fiber in super continuous spectrum.In the first chapter,we compared the excellent characteristics and applications of chalcogenide glass with other glasses.Summarized and analyzed the purpose and application value of research high nonlinear chalcogenide SCFs.In the second chapter,we analyze the diameter of suspended core effect on fiber dispersion.The spectral behavior of the supercontinuum is investigated when the pump power,pump wavelength,the length of pumped optical fiber and pump pulse width influence is changed.In the third chapter,we summarize other researchers about the As2S3 glass preparation methods,improved the preparation method of As2S3 glass and obtained high purity As2S3 glasses.The experimental results show that the IR transmittance of As2S3 glass has been obviously improved after effective purification and most of impurity absorption bands in the spectra disappeared.In the fourth chapter,we obtained the As40S60/As38S62 core-cladding structure chalcogenide optical fibers with low loss by an efficient extrusion method.This experimental indicate that the extrusion method is a suitable technique to prepare low loss chalcogenide optical fibers.In the fifth chapter,we analyze the advantages and disadvantages of traditional extrusion method to prepare chalcogenide SCFs.Then,we proposed an improved extrusion method for the preparation of multimaterial chalcogenide SCFs based on our tradition extrusion method.Finally,we use the home-made extrusion die to prepare the multimaterial chalcogenide suspended-core preform,then obtained the multimaterial chalcogenide SCFs with high nonlinear properties.In the sixth chapter,we analyses the nonlinear properties of the optical fiber and study the properties of the optical fiber in super continuous spectrum.The nonlinear coefficient of the multimaterial SCF is about 10377W^-1·km^-1@1?m.The near-field optical energy distribution image of this multi-material SCF shows the light propagates effectively into the core.The spectral behavior of the supercontinuum is investigated by changing the pump wavelength and pump power.At the end of the article,we summarize the whole paper,analyze some deficiencies in this paper and forecast for the next research of multimaterial chalcogenide SCF.