Title: Broadband Single-Shot THz Sampling Using Reflection Gratings Show Chinese title

Title: 宽带单次太赫兹采样使用反射光栅

Abstract: Single-shot electro-optic sampling (EOS) is a powerful method enabling the measurement of weak terahertz signals that would otherwise require prohibitively long acquisition times. This is generally achieved by encoding the EOS time delay into a spatial, angular, or frequency coordinate. In general, this technique operates well up to 3 THz but becomes more challenging for larger bandwidths, due to dispersion and imaging imperfections. Here, we demonstrate a reliable angular-encoding single shot EOS implementation that reaches frequencies beyond 6 THz. Diffraction simulations are used to design the experimental setup and adapt this technique to commercial reflection gratings, removing the need for custom-built echelon mirrors. Furthermore, we show that, contrary to earlier reports, group delay dispersion from angular dispersion does not reduce the bandwidth of single-shot EOS. Show Chinese abstract

Abstract: 单次电光采样（EOS）是一种强大的方法，能够测量原本需要极高获取时间的微弱太赫兹信号。 这通常是通过将EOS时间延迟编码到空间、角度或频率坐标中来实现的。 一般来说，这种技术在3 THz以下工作良好，但由于色散和成像缺陷，对于更大的带宽则变得更加困难。 在此，我们展示了一种可靠的基于角度编码的单次EOS实现，其频率可超过6 THz。 利用衍射模拟设计实验装置，并将该技术适配到商用反射光栅，消除了对定制棱镜镜的依赖。 此外，我们表明，与早期报道相反，角度色散引起的群延迟色散不会降低单次EOS的带宽。