Huang Hsin-Hui, Juodkazis Saulius, Gamaly Eugene G, Tikhonchuk Vladimir T, Hatanaka Koji
Optical Sciences Centre, School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
Nanomaterials (Basel). 2023 Sep 5;13(18):2505. doi: 10.3390/nano13182505.
The interaction of two subsequent ultra-short sub-milli-Joule laser pulses with a thin water flow results in an emission of a strong single-cycle THz pulse associated with enhanced soft X-ray emission. In this paper, a chain of processes produced in this interaction is analyzed and compared with other THz generation studies. It is demonstrated that the enhanced THz and X-ray emissions are produced by an energetic electron beam accelerated in the interaction of a main laser pulse with liquid water ejected from the surface by the pre-pulse. This scheme thus provides an efficient laser energy conversion in a THz pulse, avoiding laser self-focusing and filamentation in air.
两个连续的亚毫焦级超短激光脉冲与薄水流相互作用，会产生与增强的软X射线发射相关的强单周期太赫兹脉冲。本文分析了这种相互作用中产生的一系列过程，并与其他太赫兹产生的研究进行了比较。结果表明，增强的太赫兹和X射线发射是由主激光脉冲与预脉冲从表面喷射出的液态水相互作用加速产生的高能电子束引起的。因此，该方案在太赫兹脉冲中提供了高效的激光能量转换，避免了激光在空气中的自聚焦和丝状化。
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