新型中红外空芯光纤的制备及其性能和应用研究

发布时间：2018-04-13 12:16

本文选题：中红外 + 光子带隙　；参考：《燕山大学》2013年博士论文

【摘要】：本文首先回顾了红外传能光纤的发展史，尤其是对用于传输波长10.6μm的CO_2激光空芯氧化物介质光纤的探索与发展现状进行了论述。从理论上分析了衰减全反射(ATR)光纤在中红外波段折射率n_r1的特征，通过射线理论和光纤理论阐述Ge/GeO_2双层介质膜空芯光纤的传输机理，运用光子带隙理论设计并制备出微结构空气孔为包层的Ge/GeO_2双层介质膜空芯光纤，，改进了MCVD与拉丝一体化的工艺及设备，发展了相应的制备技术，并针对其在医疗诊断和工艺加工等方面进行了应用研究。从理论上分析了氧化物材料在中红外波段n_r1的特征，利用K-K关系，并通过实验测出材料正入射反射谱，由此计算出在反常色散区的复折射率n+ik。应用光子晶体的带隙理论，设计并制备出具有光子带隙效应和nr 1机理的带有光子晶体光纤结构的空芯传能光纤。采用改进的化学气相沉积(MCVD)方法与拉制一体化技术进一步制备出纯GeO_2膜的空芯光纤，通过氧化还原反应，将部份多晶态GeO_2介质膜还原成富Ge层，由此成功地制备出以超微结构的多晶态GeO_2为基的双层介质膜空芯传能光纤，同时进行了多种状态下的损耗测试。采用紫外光(UV)固化法在空芯传能光纤的外表面涂覆硅胶，以加强光纤的机械强度和柔软性。另外，本论文还采用Auastar360FTIR红外光谱仪以及KYKY-2800型扫描电镜等设备对制备的光纤样品进行了性能检测和实验分析。实验结果表明：用改进的MCVD与拉丝一体化设备拉制中红外传能光纤具有非常好的光学特性。提出测量传输CO_2激光能量光纤的能量分布的新实验方案，首次使用针孔扫描法、热敏直接曝光法。通过实验比较，得到了热敏直接曝光法效果较好，并根据光斑的照射时间绘制出了光纤输出光模式的变化。本论文还对具有自主知识产权的光纤双透镜、三透镜聚焦系统进行了设计，并通过实验研究了由不同透镜组成的光学系统对光束聚焦及缩束作用的影响。将已制备的新型结构的中红外传输CO_2激光能量光纤用于医疗临床开展实验。通过研制“带光纤的CO_2激光治疗机”应用于腹腔手术说明了光纤所具有的独特优势，也为腹腔镜进入人体进行微创手术提供了前期准备。同时，还利用自主研制的新型中红外光纤配合医学红外光谱仪在生物体表进行检测，经光谱检测分析，该光纤可传输波长为3~12μm，并且中间没有出现大的吸收峰，完全达到了临床使用的要求。
[Abstract]:In this paper, the history of red external energy transfer fiber is reviewed, especially the exploration and development of hollow oxide dielectric fiber of CO_2 laser used for transmitting wavelength 10.6 渭 m.In this paper, the characteristics of attenuated total reflectance (n_r1) fiber in the mid-infrared band are analyzed theoretically. The propagation mechanism of Ge/GeO_2 double-layer dielectric film hollow core fiber is expounded by ray theory and fiber theory.The hollow fiber with Ge/GeO_2 bilayer dielectric film was designed and fabricated by using photonic band gap theory. The process and equipment of integration of MCVD and wire drawing were improved, and the corresponding fabrication technology was developed.And it is applied in medical diagnosis and processing.In this paper, the characteristics of n_r1 in the mid-infrared band of oxide materials are theoretically analyzed. By using K-K relation, the normal incident reflectance spectra of the materials are measured experimentally, and the complex refractive index n iks in the anomalous dispersion region are calculated.Based on the bandgap theory of photonic crystal, an empty core energy transfer fiber with photonic crystal fiber structure is designed and fabricated with photonic bandgap effect and nr1 mechanism.The hollow fiber of pure GeO_2 film was further prepared by the improved chemical vapor deposition (CVD) method and the integrated technique of drawing. Through the redox reaction, some polycrystalline GeO_2 dielectric films were reduced to GE rich layer.Based on the ultrastructural polycrystalline GeO_2, a double-layer dielectric film hollow core energy transfer fiber has been successfully prepared, and the loss measurement has been carried out at the same time.In order to enhance the mechanical strength and softness of the hollow energy transfer fiber, the external surface of the hollow energy transfer fiber was coated with silica gel by UV curing method.In addition, Auastar360FTIR infrared spectrometer and KYKY-2800 scanning electron microscope were used to test and analyze the properties of the optical fiber samples.The experimental results show that the improved MCVD and wire drawing equipment has very good optical properties.A new experimental scheme for measuring the energy distribution of CO_2 laser optical fiber is proposed. The method of pinhole scanning and thermal direct exposure is used for the first time.The experimental results show that the heat sensitive direct exposure method is effective and the output mode of the optical fiber is plotted according to the irradiation time of the spot.In this thesis, the optical double lens and three lens focusing system with independent intellectual property rights are designed, and the effect of the optical system composed of different lenses on the beam focusing and beam shrinking is studied experimentally.A new type of CO_2 laser energy fiber with a new structure has been prepared and used in medical clinic.The application of "CO_2 laser therapy machine with optical fiber" in celiac surgery shows the unique advantages of optical fiber, and provides preliminary preparation for laparoscopy to enter human body for minimally invasive surgery.At the same time, the newly developed medium infrared optical fiber was also used to detect the biological surface with the medical infrared spectrometer. The optical fiber can be transmitted at a wavelength of 312 渭 m by spectral analysis, and there is no large absorption peak in the middle.It completely meets the requirement of clinical use.
【学位授予单位】：燕山大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TN253

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