环烯烃共聚物空芯微结构太赫兹光纤的设计与制造  

Design and fabrication of cyclic-olefin copolymer based hollow-core microstructured terahertz fiber

作　　者：姬江军[1] 孔德鹏[1] 马天[1] 何晓阳[2] 陈琦[2] 王丽莉[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119 [2]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《红外与激光工程》2014年第6期1909-1913,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(61275106;61108061)

摘　　要：以环烯烃共聚物（cyclic-olefin copolymer，COC）材料为基质，设计、制造了一种空芯多孔包层太赫兹（THz）纤维。利用comsol软件模拟了芯径为6mml的光纤在0．2—1．5THz波段的损耗特性，结果表明：在0．85。1．5THz波段存在多个低损耗频带，而且在0．85—1．1THz波段有低于3dB／m的三个窗口：特别是在0．99THz，损耗达到0．208dB／m。芯径为3rain、4．8mln和6mm的光纤在0．8-1．5THz波段的损耗特性对比分析表明：该COC微结构多孔包层空芯纤维的损耗随着光纤外径的增加而减小。把设计的太赫兹纤维外径放大7倍达到7cm，据此设计制造了光纤预制棒成型专用模具。借助热挤出成型方法得到了结构完整、孔洞表面光滑，长度为22cm的空芯多孔包层预制棒。利用该实验室独有的微结构光纤拉丝塔，成功获得了微结构保持完好的光纤样品。损耗分析结果表明：6mm芯径的光纤样品在1．27THz的平均损耗为2．175dB／m，与该频率的理论损耗（1．95dB／m）接近。A hollow-core porous microstructured terahertz fiber based on Topas cyclic-olefin polymer （COC） was designed and manufactured. The loss characteristics of an optical fiber with outer diameter 10 mm was simulated using comsol software in the 0.2-1.5 THz band. There are several low-loss bands in the 0.85-1.5 THz, and there are three windows in which the loss is lower than 3 dB/m in the 0.85-1.1 THz band, the loss is about 0.208 dB/m especially in the 0.99 THz. By comparing the loss characteristics of the fiber with core diameter of 3 mm, 4.8 mm and 6 mm in 0.8-1.5 THz band, the loss was reduced with increasing the diameter. The outer diameter of designed THz fiber was enlarged to 7 cm, and a dedicated mold was designed for manufacturing preform. A 22 cm long THz fiber preform with a standard structure and smooth surface was manufactured by the hot extrusion molding method. Finally,through the laboratory＇s unique draw tower, the terahertz fiber of the core diameter of 3 mm, 4.8 mm and 6 mm were manufactured. The loss analysis result show that the average loss of the fiber with core diameter of 6mm is 2.175dB/m in 1.27THz and it is near the theoretical loss （1.95 dB/m）.

关 键 词：微结构太赫兹纤维 空芯波导 抗共振反射 损耗特性 环烯烃共聚物 

分 类 号：O439[机械工程—光学工程]