飞秒激光场旋转水分子产生的太赫兹辐射

IF 1.8 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Yezi Pu, Xiao-Yu Peng, Xuan Shi, Hongquan Zhao
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引用次数: 0

摘要

通过将飞秒激光脉冲聚焦在水膜或水线上,可以从水等离子体中产生常规的太赫兹辐射。然而,目前还没有关于非等离子体条件下飞秒激光脉冲强电场直接驱动旋转水分子产生太赫兹辐射的相关报道。在此,我们基于量子力学理论建立了一个水分子理论模型来研究激光电场与水分子之间的相互作用。我们发现,在线性偏振中红外激光(激光强度≤ 1012 W∙cm-2)的驱动下,旋转水分子的旋转能级跃迁可产生宽带太赫兹辐射(带宽约为 10 THz)。我们证明,可以通过改变激光强度及其脉冲持续时间来控制所产生的太赫兹光谱。此外,对于高斯泵浦激光束,当激光脉冲持续时间从 150 fs 增加到 400 fs 时,太赫兹波的高频成分逐渐增加,而低频成分逐渐减少。我们的研究结果为从水中产生太赫兹波提供了新的思路和可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Terahertz Radiation from Water Molecules Rotated by Femtosecond Laser Field

Terahertz Radiation from Water Molecules Rotated by Femtosecond Laser Field

THz radiation can be generated routinely from water plasmas by focusing femtosecond laser pulses on a water film or water line. However, there are no relevant reports on the THz generation from rotated water molecules driven directly by strong electric field of femtosecond laser pulses under non-plasma condition. Here, we develop a theoretical model of water molecules to study the interaction between laser electric field and water molecules based on quantum mechanics theory. We find that broadband THz radiation (bandwidth ~ 10 THz) can be generated through the transitions of rotational energy levels of the rotated water molecules driven by a linear polarization mid-infrared laser (laser intensity ≤ 1012 W∙cm−2). We demonstrate that the generated THz spectrum can be controlled by changing the laser intensity and its pulse duration. Moreover, for a Gaussian pump laser beam, the high-frequency components of THz wave increase gradually, while the low-frequency components decrease gradually when the laser pulse duration increases from 150 to 400 fs. Our results provide a new idea and possibility for THz generation from water.

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来源期刊
Journal of Infrared, Millimeter, and Terahertz Waves
Journal of Infrared, Millimeter, and Terahertz Waves 工程技术-工程:电子与电气
CiteScore
6.20
自引率
6.90%
发文量
51
审稿时长
3 months
期刊介绍: The Journal of Infrared, Millimeter, and Terahertz Waves offers a peer-reviewed platform for the rapid dissemination of original, high-quality research in the frequency window from 30 GHz to 30 THz. The topics covered include: sources, detectors, and other devices; systems, spectroscopy, sensing, interaction between electromagnetic waves and matter, applications, metrology, and communications. Purely numerical work, especially with commercial software packages, will be published only in very exceptional cases. The same applies to manuscripts describing only algorithms (e.g. pattern recognition algorithms). Manuscripts submitted to the Journal should discuss a significant advancement to the field of infrared, millimeter, and terahertz waves.
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