金属毛细管二氧化锗中红外空芯光纤的研究

发布时间：2018-06-30 00:59

本文选题：二氧化碳激光 + 衰减全反射中红外空芯光纤　；参考：《华东师范大学》2017年硕士论文

【摘要】：以二氧化碳激光为代表的中红外激光波长位于8-14μm大气窗口,在红外激光雷达、红外热成像、化学传感、窄禁带半导体电子输运操控、激光医疗、材料成型加工等军事或民用领域有重要应用。衰减全反射型(ATR)空芯光纤传输二氧化碳激光具有结构简单、无端面反射、传输模式好、能量损伤阀值高和输出光束发散角小等优点,一直是该领域研究的重要课题之一。针对玻璃毛细管二氧化锗空芯光纤容易脆性断裂以及导热性不良的问题,本课题组提出了用室温液相沉积法制备金属毛细管二氧化锗全反射中红外空芯光纤的思想。选用市面上品种和尺寸较多的不锈钢毛细管作为光纤结构管,首次探讨了不锈钢毛细管二氧化锗全反射中红外空芯光纤的低成本制备技术,尤其是毛细管内二氧化锗反射膜的液相沉积工艺对其激光传输性能的影响。针对金属毛细管空芯光纤传输高能激光可能导致金属结构管热氧化损伤的问题,提出了用具有优异耐高温、抗氧化性能的镍-铬合金制备金属毛细管二氧化锗空芯光纤的思路。研究了该种光纤的制备工艺,分析讨论了光纤的耐高温氧化性能、传输二氧化碳激光的传输损耗、输出激光光束的能量分布和发散角等内容。空芯光纤在激光医疗、3D打印、焊接和切割金属应用中容易因为表面过热而误伤人体或发生热氧化损坏。首次对金属毛细管二氧化锗衰减全反射空芯光纤传输激光的热性能进行了评估,对光纤传输激光时的轴向温度分布进行了理论模拟计算,并与实验测得的结果进行了对比分析。依据理论和实验研究的结果,对不锈钢和镍-铬合金毛细管二氧化锗ATR空芯光纤在激光医疗、材料成型加工等实际应用中传输激光的安全功率进行了评估,为该类光纤的实际应用提供了理论和技术支持。
[Abstract]:The wavelength of mid-infrared laser, represented by carbon dioxide laser, is located in the atmospheric window of 8-14 渭 m, in infrared lidar, infrared thermal imaging, chemical sensing, narrow gap semiconductor electron transport control, laser medical treatment, Material molding processing and other military or civil areas have important applications. Attenuated Total Reflectance (ATR) hollow fiber transmission carbon dioxide laser has many advantages such as simple structure, no end reflection, good transmission mode, high energy damage threshold and small divergence angle of output beam. It has been one of the important research topics in this field. In order to solve the problems of brittle fracture and poor thermal conductivity of glass capillary GE _ 2O _ 2 hollow fiber, the idea of fabricating metal capillary GE _ 2O _ 2 total reflection mid-infrared hollow fiber by liquid phase deposition at room temperature was proposed. In this paper, stainless steel capillaries, which are widely available in the market, are selected as fiber structure tubes. The low cost preparation technology of stainless steel capillary GE _ 2O _ 2 total reflection mid-infrared hollow fiber is discussed for the first time. In particular, the effect of liquid deposition of germanium oxide reflective film in capillary on the laser transport performance is investigated. In view of the problem that high energy laser transmission in hollow core fiber of metal capillary may lead to thermal oxidation damage of metal structure tube, the idea of preparing metal capillary germanium oxide hollow fiber with Ni-Cr alloy with excellent high temperature resistance and oxidation resistance is put forward. The preparation process of this kind of fiber is studied. The properties of high temperature oxidation resistance, transmission loss of carbon dioxide laser, energy distribution and divergence angle of the output laser beam are analyzed and discussed. Hollow fiber can easily damage human body or thermal oxidation in laser medical 3D printing, welding and cutting metal applications because of surface overheating. The thermal properties of GE _ 2O _ 2 attenuated hollow-core optical fiber transmission in metal capillary are evaluated for the first time. The axial temperature distribution of optical fiber transmission is theoretically simulated and compared with the experimental results. Based on the theoretical and experimental results, the safe power of laser transmission in practical applications of stainless steel and Ni-Cr alloy capillary germanium oxide ATR hollow fiber in laser medical treatment and material processing is evaluated. It provides theoretical and technical support for the practical application of this kind of optical fiber.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

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