Lei Hong-Yi, Sun Fang-Zheng, Wang Tian-Ze, Chen Hao, Wang Dan, Wei Yan-Yu, Ma Jing-Long, Liao Guo-Qian, Li Yu-Tong
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
iScience. 2022 Apr 30;25(5):104336. doi: 10.1016/j.isci.2022.104336. eCollection 2022 May 20.
The terahertz radiation from ultraintense laser-produced plasmas has aroused increasing attention recently as a promising approach toward strong terahertz sources. Here, we present the highly efficient production of millijoule-level terahertz pulses, from the rear side of a metal foil irradiated by a 10-TW femtosecond laser pulse. By characterizing the terahertz and electron emission in combination with particle-in-cell simulations, the physical reasons behind the efficient terahertz generation are discussed. The resulting focused terahertz electric field strength reaches over 2 GV/m, which is justified by experiments on terahertz strong-field-driven nonlinearity in semiconductors.
超短超强激光产生的太赫兹辐射作为一种实现强太赫兹源的有前景的方法，近来引起了越来越多的关注。在此，我们展示了从被10太瓦飞秒激光脉冲辐照的金属箔背面高效产生毫焦级太赫兹脉冲。通过结合太赫兹和电子发射特性以及粒子模拟，讨论了高效太赫兹产生背后的物理原因。产生的聚焦太赫兹电场强度超过2吉伏/米，这在半导体中太赫兹强场驱动非线性的实验中得到了验证。
