Center for Terahertz Research, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.
Phys Rev Lett. 2009 Dec 4;103(23):235002. doi: 10.1103/PhysRevLett.103.235002. Epub 2009 Dec 2.
We report the study of femtosecond laser-induced air plasma fluorescence under the illumination of terahertz (THz) pulses. Semiclassical modeling and experimental verification indicate that time-resolved THz radiation-enhanced emission of fluorescence is dominated by the electron kinetics and the electron-impact excitation of gas molecules or ions. We demonstrate that the temporal waveform of the THz field could be retrieved from the transient enhanced fluorescence, making omnidirectional, coherent detection available for THz time-domain spectroscopy.
我们报告了飞秒激光诱导空气等离子体荧光在太赫兹（THz）脉冲照射下的研究。半经典建模和实验验证表明，时间分辨的 THz 辐射增强荧光发射主要由电子动力学和气体分子或离子的电子碰撞激发决定。我们证明了可以从瞬态增强荧光中提取太赫兹场的时间波形，从而为太赫兹时域光谱提供全向相干检测。
