Chai Xin, Ropagnol Xavier, Mora Luis Sanchez, Raeiszadeh S Mohsen, Safavi-Naeini Saffiedin, Blanchard François, Ozaki Tsuneyuki
INRS-EMT, Advanced Laser Light Source, INRS, Varennes, Québec, J3X1S2, Canada.
Electrical Engineering Department, École de Technologie Supérieure, Montréal, Québec, H3C1K3, Canada.
Sci Rep. 2020 Sep 22;10(1):15426. doi: 10.1038/s41598-020-72049-9.
Ideally, the full characterization of coherent terahertz (THz) pulses would provide information on the amplitude and direction of its THz electric field, in space and in time, with unlimited dynamic range. Here, we propose and demonstrate a new approach based on the Stokes-Mueller formalism. Our approach can measure the full temporal and spatial variation of coherent THz fields, as well as its polarization state with a high dynamic range. This method employs a simple configuration, using a polarization state analyzer after the electro-optic sampling crystal. This technique could allow high sensitivity due to its ability to use thick detection crystals, which also would lead to improved spectral resolution by allowing longer scans in the time domain.
理想情况下，对相干太赫兹（THz）脉冲进行全面表征将提供其太赫兹电场在空间和时间上的幅度和方向信息，且具有无限的动态范围。在此，我们提出并演示一种基于斯托克斯 - 穆勒形式主义的新方法。我们的方法能够测量相干太赫兹场的完整时空变化及其具有高动态范围的偏振态。该方法采用简单的配置，在电光采样晶体之后使用偏振态分析仪。由于能够使用厚检测晶体，该技术可实现高灵敏度，这也将通过允许在时域中进行更长时间的扫描来提高光谱分辨率。
