Kiessling Jens, Sowade Rosita, Mayorga Iván Cámara, Buse Karsten, Breunig Ingo
Institute of Physics, University of Bonn, Bonn, Germany.
Rev Sci Instrum. 2011 Feb;82(2):026108. doi: 10.1063/1.3553397.
The combination of an all-optical terahertz source with a photoconductive antenna to achieve coherent detection is presented. This approach aims to overcome the frequency limits introduced by optoelectronic terahertz sources commonly used. Here the Gaussian-shaped and linearly polarized terahertz waves are generated by a continuous wave optical parametric oscillator with a power of 3 μW at 1.4 THz. The infrared signal light of the optical parametric oscillator can be used to coherently detect the generated terahertz wave with a photoconductive antenna. As a proof-of-principle experiment we determine the thickness profile of a plastic lens using phase shifting interferometry.
本文介绍了一种将全光太赫兹源与光电导天线相结合以实现相干探测的方法。这种方法旨在克服常用光电太赫兹源所引入的频率限制。在此，高斯形状且线性偏振的太赫兹波由连续波光参量振荡器产生，在1.4太赫兹时功率为3微瓦。光参量振荡器的红外信号光可用于通过光电导天线对产生的太赫兹波进行相干探测。作为原理验证实验，我们使用相移干涉测量法确定了一个塑料透镜的厚度分布。
