论文标题
飞秒在环境空气中
Femtosecond streaking in ambient air
论文作者
论文摘要
我们展示了一种新的方法，可以测量具有光频率的电场的时间演化。我们的技术基于空气等离子体中瞬时电流的检测。这些定向电流是由用短泵脉冲的空气的亚周期电离引起的，以及释放的电子的转向，并用要采样的脉冲。我们通过将方法与不同的最新激光 - 脉冲特征技术进行比较来评估我们的方法的有效性。值得注意的是，我们的方法在环境空气中起作用，并促进了对场波的直接测量，可以以与射频信号完全相同的方式在示波器上实时查看。
We demonstrate a novel method to measure the temporal evolution of electric fields with optical frequencies. Our technique is based on the detection of transient currents in air plasma. These directional currents result from sub-cycle ionization of air with a short pump pulse, and the steering of the released electrons with the pulse to be sampled. We assess the validity of our approach by comparing it with different state-of-the-art laser-pulse characterization techniques. Notably, our method works in ambient air and facilitates a direct measurement of the field waveform, which can be viewed in real time on an oscilloscope in the exact same way as a radio frequency signal.
