Molter D, Wagner A, Weber S, Jonuscheit J, Beigang R
Fraunhofer Institute for Physical Measurement Techniques IPM, Department of Terahertz Measurement and Systems, Erwin-Schroedinger-Str., Building 56, 67663 Kaiserslautern, Germany.
Opt Express. 2011 Mar 14;19(6):5290-6. doi: 10.1364/OE.19.005290.
We present a novel technique to generate a continuous, combless broadband Terahertz spectrum with conventional low-cost laser diodes. A standard time-domain spectroscopy system using photoconductive antennas is pumped by the output of two tunable diode lasers. Using fine tuning for one laser and fine and coarse tuning for the second laser, difference frequency generation results in a continuous broadband THz spectrum. Fast coarse-tuning is achieved by a simple spatial light modulator introduced in an external cavity. The results are compared to multi-mode operation for THz generation.
我们提出了一种利用传统低成本激光二极管产生连续、无梳状宽带太赫兹光谱的新技术。一个使用光电导天线的标准时域光谱系统由两个可调谐二极管激光器的输出泵浦。通过对一个激光器进行微调，对第二个激光器进行精细和粗调，差频产生可得到连续宽带太赫兹光谱。通过在外腔中引入一个简单的空间光调制器实现快速粗调。将结果与太赫兹产生的多模操作进行了比较。
