Sun J H, Gallacher J G, Brussaard G J H, Lemos N, Issac R, Huang Z X, Dias J M, Jaroszynski D A
National Electromagnetic Scattering Laboratory, Beijing 100854, People's Republic of China.
Rev Sci Instrum. 2009 Nov;80(11):113103. doi: 10.1063/1.3245342.
An accurate and direct measurement of the energy distribution of a low repetition rate terahertz electromagnetic pulse is challenging because of the lack of sensitive detectors in this spectral range. In this paper, we show how the total energy and energy density distribution of a terahertz electromagnetic pulse can be determined by directly measuring the absolute electric field amplitude and beam energy density distribution using electro-optic detection. This method has potential use as a routine method of measuring the energy density of terahertz pulses that could be applied to evaluating future high power terahertz sources, terahertz imaging, and spatially and temporarily resolved pump-probe experiments.
由于在该光谱范围内缺乏灵敏的探测器，准确直接地测量低重复率太赫兹电磁脉冲的能量分布具有挑战性。在本文中，我们展示了如何通过电光检测直接测量绝对电场振幅和光束能量密度分布来确定太赫兹电磁脉冲的总能量和能量密度分布。这种方法有潜力用作测量太赫兹脉冲能量密度的常规方法，可应用于评估未来的高功率太赫兹源、太赫兹成像以及空间和时间分辨的泵浦 - 探测实验。
