Study On Design And Preparation Of Chalcogenide Glass Photonic Crystal Fiber For Mid-infrared

Chalcogenide glass photonic crystal fibers combining the good infrared transmission ofchalcogenide glass and unique optical characteristics of photonic crystal fiber become one hotspotof the optoelectronics. Chalcogenide glass photonic crystal fibers break the limit of transmissionwindow below3μm with traditional quartz and expand the application of fiber optic devices.Chalcogenide glass photonic crystal fibers can be used for infrared sensor, communications,infrared supercontinuum and other infrared photonic technology.In this thesis, we studied the theoretical design and experimental preparation of chalcogenideglass photonic crystal fibers. Theoretically, we focused on the relationship between opticalcharacteristics and structural parameters of the designed photonic crystal fiber. By optimizing thestructure parameters, fibers with special optical properties were obtained. In the experimentalpreparation, we tried three different methods for the preparation of chalcogenide glass photoniccrystal fibers and evaluated their feasibility. The paper was organized as follows:In chapter one, the research and development course of photonic crystals and photonic crystalfiber were briefly described. The latest studies of matrix composition, preparation methods,theoretical design and application of chalcogenide glass photonic crystal fibers were concluded.The deficiencies and difficulties of chalcogenide glass photonic crystal fibe were anysised. Finally,the general idea and content of this thesis was mentioned.In chapter two, some basic theoretical analysis methods for photon photonic crystal fiber werebrief introduced. The main ideas and calculation realization multi-polar method, finite elementmethod and plane wave expansion method were expounded.In chapter three, preparation process of chalcogenide glass was introduced. Then the relevanttests of bulk glass were carried out. We got the transmittance, refractive index and thermal stabilityparameters of the glass.In chapter four, we studied the total internal reflection photonic crystal fiber. Based onchalcogenide glass test parameters, multi-pole method was employed to study the dispersionproperties of the Ge₂₀Sb₁₅Se₆₅chalcogenide photonic crystal fiber. By optimizing the sturcureparameters, the dispersion flat photonic crystal fiber through of3⁵μm was obtained. Then, plane-wave method was employed to study the nonlinear properties of the Ge₂₀Sb₁₅Se₆₅chalcogenide photonic crystal fiber. By optimization structural parameter a highly non-linear fiber was got. By3.5μm laser pump, signal can be effective amplified. The gain bandwidth was up to300nm.In chapter five, the photonic band gap photonic crystal fiber of chalcogenide glass was studied.With plane wave expansion method and finite element method, the photonic band gap, mode areaand confinement loss of the Ge₃₀Sb₈Se₆₂photonic band photonic crystal fiber were systematicallystudied. By optimizing the structure parameters of fiber, photonic crystal fiber with lowerconfinement loss less at10.6μm was obtainedIn chapter six, combing the most general preparation method of chalcogenide glass photoniccrystal fiber, some preparation methods were explored. The rotating centrifugal method was usedfor prepared the Ge₂₀Sb₁₅Se₆₅chalcogenide glass hollow tube. Some preliminary were tested by anoptical microscope. We explored the casting-method to prepare Ge₂₀Sb₁₅Se₆₅and Ge₂₀Sb₁₅S₆₅optical fiber preform. We also explored the mechanical drilling method to prepare Ge₂₀Sb₁₅S₆₅preform, and obtained several preform. Some preforms were drawn actual and preliminary testedAt summary, all results of the present work were concluded, and some shortages whichshould be improved in the future were also pointed out.