共查询到18条相似文献,搜索用时 125 毫秒
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为研制10.6μm空芯传能光纤,讨论了银层质量、碘化银层质量对空芯波导传输损耗的影响.介绍了研制波长为10.6 μm的空芯传能光纤的工艺方案及其典型参数.通过液相化学沉积法,在石英基底管内壁成功地生成了优质金属银层和碘化银电介质包层.制作了出具有高透过率的空芯红外波导. 相似文献
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设计并制备了一种新型的聚酰亚胺/银空芯波导,其实验工作的重点是聚酰亚胺薄膜的制备。采用改进的液相工艺,我们在石英毛细管内制备了表面光滑均一的银膜,然后,再将近折射率非常接近理论最佳值(√2)的聚酰腚胺膜涂覆在银管内。通过控制聚酰亚胺膜的厚度,可以对银空芯波导在特定的波长处有降低损耗的作用,除了6-9μm处的基因吸收外,这种空芯波导在中红外区域的损耗都很小。在10.6μm波长处的损耗为0.4dB/m,传输能量为10w时,可以稳定传输20min以上,基本上可以满足CO2激光在医疗中的应用。 相似文献
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医用CO2激光传输用空芯波导的研制 总被引:1,自引:0,他引:1
本文作者设计并制备了一种新型的CO2激光传输用空芯波导。除了6μm-9μm处的基团吸收外,这种空芯波导在整个中红外区域的损耗都很小,在10.6μm波长处的损耗约为0.4db/m,传输能量为10W时,可以稳定传输20分钟以上,基本上可以满足CO2激光在医疗中的应用。 相似文献
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设计并制备了一种新型的聚酰亚胺/银空芯波导,其实验工作的重点是聚酰亚胺薄膜的制备。采用改进的液相工艺,我们在石英毛细管内制备了表面光滑均一的银膜,然后,再将折射率非常接近理论最佳值( )的聚酞亚胺膜涂覆在银管内。通过控制聚酰亚胺膜的厚度,可以对银空芯波导在特定的波长处有降低损耗的作用。除了 6~9μm处的基团吸收外,这种空芯波导在整个中红外区域的损耗都很小。在 10.6μm波长处的损耗为0.4 dB/m,传输能量为 10 W时,可以稳定传输 20 min以上,基本上可以满足 CO2激光在医疗中的应用。 相似文献
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1 引 言 1 995年由Birks提出的光子晶体光纤是一种将光子禁带用于波导原理的光纤。利用这一新的波导原理使空芯导光成为可能 ,因此这种光纤有望成为非常优异的低损耗、低非线性的传输通道。即使在石英光纤已得到广泛应用的今天 ,在长距离、大容量的传输系统中 ,为了补偿光纤的损耗 ,仍需采用高精度的光放大技术。而波长通道间的非线性相互作用或频带间喇曼散射已成为限制频带使用效率或传输的因素之一 ,因此空芯传输显示出特殊的重要性。然而 ,值得注意的是光子晶体光纤并非仅仅通过光子禁带进行导光 ,其一般结构是在玻璃中均匀排… 相似文献
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本文的目的是建立线偏振红外光在具有轴对称经向非均匀空芯波导中的传输模型。 Marcatili分析了光在圆型空芯波导中的传输,指出在一定条件下波导可用来传输光波进行通信,并可用于制造激光放电管。他们得到空芯直波早的模场分布和损耗的解析式。其结果被广为引用,发展了波导激光器理论。与此同时,关于波导用于传输光能方面的研究也相 相似文献
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研究了渐变型空芯波导(GTHW)在太赫兹波段的传输特性。基于几何光学方法,仿真分析了波导的输出光束质量和传输损耗特性。相比均匀型空芯波导,当光从渐变型空芯波导的大端传输至小端或沿相反方向传输时,渐变型波导具有特殊性能。当光从波导大端传输至小端,渐变型和均匀型波导具有相似的弯曲附加损耗,并且渐变型波导具有更高的耦合效率,便于与多种光源耦合;当光从波导小端传输至大端,渐变型波导的传输损耗和输出光束发散角更小。仿真了波导弯曲率、光源发散角和波导锥度等参数对传输损耗的影响。采用波长532 nm的半导体激光器作为光源,进行了验证实验。测量数据与仿真结果有很好的一致性。 相似文献
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Transmission characteristics of dielectric-coated metallic waveguide for infrared transmission: Slab waveguide model 总被引:2,自引:0,他引:2
A metallic hollow waveguide with inner dielectric multilayers is proposed for the transmission of infrared light and its basic transmission characteristics are fully analyzed by using a two-dimensional slab waveguide model. The power loss in the waveguide is shown to be extremely reduced by coating dielectric layers properly. Simple loss formulas are also presented which consider absorptions of dielectric materials, and minimum possible losses are theoretically estimated. Finally, relations to bending losses in the waveguide are discussed. 相似文献
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制作了具有不同介质膜厚度的大口径柔性介质金属膜波导,测试了金属膜波导和介质金属膜波导在G波段、4. 3 THz和中远红外等频段的传输特性.结果表明,波导的传输损耗在G波段随介质膜厚的增加而增加,孔径2. 6mm的金属膜波导在160 GHz传输损耗为2. 1 d B/m且在G波段波导的传输损耗对弯曲不敏感.在4. 3 THZ频点波导的传输损耗随介质膜厚的增加而减小,镀制介质膜可以大幅减小波导的传输损耗以及弯曲附加损耗,孔径3. 6mm介质膜厚为1. 2μm的介质金属膜波导的传输损耗为2. 84 d B/m.光斑能量则随介质膜厚的增加更加集中于低阶传输模式. 相似文献
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The transmission characteristics of curved dielectric waveguide are analyzed with a method, which combines the staircase approximation with the edge element analysis and mode matching procedure. In each stair the uniform waveguide is treated with edge element method. Then the transmission property of the whole curved guiding structure is calculated with multimode network methods. The effectiveness of the present method is justified by the results given in the literature. It is believed that this approach can be applied to a variety of curved dielectric waveguides with arbitrary transverse profiles. 相似文献
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《Microwave Theory and Techniques》1980,28(6):536-541
Loss formula of the dielectric tube leaky waveguide is derived by using a transverse transmission-line model which carries most of the transmitted power in air inside a dielectric tube. It is shown that low-loss leaky waveguide can be realized in optical through submillimiter wavelengths with moderate guide parameters and the transmission loss does not depend strongly on the material losses. It is also shown that the attenuation constant of this leaky waveguide is smaller than that of the hollow waveguide by several orders of magnitude. 相似文献
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Fiber-coupled short Fabry-Perot resonators 总被引:1,自引:0,他引:1
An air-gap Fabry-Perot resonator with plane mirrors between closely spaced fiber ends may yield low throughput because of the poor match between the modes of typical single-mode fibers and the resonant mode in the air-gap cavity. The throughput can be improved by confining the resonant mode by a hollow dielectric tube placed inside the resonator. Short fiber-coupled Fabry-Perot resonators with and without an inserted hollow dielectric waveguide and expressions for their transmission losses are derived. It is shown that the throughput of both types of resonator can be improved significantly by using fiber with large mode size to couple to the resonator. The special fiber is then spliced to a conventional single-mode fiber. It is concluded that the resonator with an inserted hollow dielectric waveguide offers increased throughput for resonators with high finesse 相似文献
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《Microwave Theory and Techniques》1977,25(8):648-656
This paper describes a computer-aided analysis of dissipation losses in uniform isolated or coupled transmission lines for microwave and millimeter-wave integrated-circuit applications. The analysis employs a quasi-TEM model for isolated transmission lines and for the even- and odd-mode transmission lines associated with coupled-line structures. The conductor and dielectric losses are then related to equivalent charge density distributions, which are evaluated using a method-of-moments solution. The transmission lines treated by this analysis may contain any number of Iossy conductors and inhomogeneous dielectrics, consisting of any number of different homogeneous dielectric regions. A development is provided to explicitly relate the four-port terminal-electrical performance of directional couplers to evaluated even- and odd- mode loss coefficients. Examples of evaluated losses are presented in graphical form for isolated lines of inverted microstrip and trapped inverted microstrip and edge-coupled microstrip with a dielectric overlay. The analysis accuracy has been confirmed using microstrip and coplanar waveguide configurations. A comparison is made of the total loss characteristics for microstrip, coplanar waveguide, inverted microstrip, and trapped inverted microstrip. Calculations are compared with measurements for the coupled-line structure. Accuracy of the solution and suggested refinements are discussed. Five computer programs are documented. 相似文献
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圆形电介质包层金属空心光纤 总被引:2,自引:0,他引:2
苏宇欢 《光纤与电缆及其应用技术》2001,(4):39-45
综述了圆形电介质包层金属空心光纤的材料特性、制作工艺与应用 ,并指出了该材料的发展趋势 相似文献