基于光学技术的太赫兹相干辐射源研究

由于太赫兹辐射的独特性质和潜在的应用价值, 国内外关于太赫兹波的产生和探测的研究正呈现日益繁荣的景象, 目前太赫兹相干辐射源的研究已成为太赫兹技术领域最重要的前沿课题之一。介绍了产生太赫兹相干辐射的三种主要途径：一是光学技术, 它从高频向低频发展, 其代表为太赫兹激光器, 如气体激光器、半导体激光器和量子级联激光器等; 二是电子学技术, 它由低频向高频发展, 如微波管、固体微波源等; 三是光电子技术, 其频率由1 THz向两侧展宽, 采用超快激光脉冲触发产生太赫兹脉冲。设计了基于光学技术的太赫兹相干辐射系统, 该装置根据气体振转能级跃迁原理, 采用高压直流激励方式产生受激辐射, 波导管谐振腔体, 工作气体为N2, CD4和D2, 经过优化设计, 预计可以产生1.54 THz和1.58 THz的波连续输出。

Research into the Terahertz Coherent Radiation Source in View of Optical Technique

Because of the unique nature of terahertz radiation and its potential applied value, the research on the generation and detection of it is increasingly flourished. At present the study of the coherent radiation of terahertz has become one of the most important frontier research topics in the field. Three main ways of the generation of terahertz coherent radiation are demonstrated here. The first one is optical technique, which develops from low to high frequency. Terahertz laser is the representative, like gas laser, semiconductor laser and quantum cascade laser. The second is electronic technique, which develops from high to low frequency, like microwave tube and solid microwave source. The third is photo electronic technique, whose frequency spreads from 1 THz to both sides. The technique that the ultra fast laser triggers terahertz pulse is adopted. The terahertz coherent radiation system is designed in view of optical technique. The principle of the device is vibrational-rotational transitions of gas, by means of high pressure direct current driving excited radiation and waveguide resonating cavity. Its functional gases are N2, CD4 and D2. It may generate 1.54 THz and 1.58 THz continuous output through optimization design.