聚四氟乙烯材料的太赫兹特性

太赫兹(THz)辐射能够穿透很多对可见光不透明的非金属、非极性材料,而用X辐射对这些材料成像的对比度又相对低,因此,太赫兹成像在安全检测和生产质量控制等领域日益受到重视。对成像材料的太赫兹特性的实际测量是太赫兹成像技术的重要组成部分。利用CO_2激光抽运太赫兹激光对聚四氟乙烯材料的太赫兹吸收特性和透过光斑轮廓进行了实验研究,获得聚四氟乙烯在70.51μm,96.5μm,118.83μm,122.4μm,158.51μm,184.31μm和214.58μm波长的吸收系数。

Terahertz Absorption Characteristics of POlytetrafluoroethylene

Terahertz (THz) radiation can penetrate many materials that are opaque to visible light, such as non-metal and non-polar materials, and these materials′ X-ray imaging are relative lower. Thus, THz imaging for security and quality control application has been paid great attention. Actual measurement on the THz characteristics is an important part of THz imaging technology. In this paper, THz laser pumped by a CO2 laser was used to measure polytetrafluoroethylene absorption characteristics and transmission beam profile. The absorption coefficients of polytetrafluoroethylene were achieved experimentally at wavelength of 70.51 μm, 96.5 μm, 118.83 μm, 122.4 μm, 158.51 μm, 184.31 μm and 214.58 μm.