Flowing cryogenic liquid target for terahertz wave generation
Flowing cryogenic liquid target for terahertz wave generation
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DOI：
10.1063/5.0023106
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发表时间：
2020-10-01
期刊：
影响因子：
1.6
通讯作者：
Zhang, X. -C.
中科院分区：
文献类型：
--
作者：
E, Yiwen;Cao, Yuqi;Zhang, X. -C.
强激光脉冲激发液体产生的太赫兹波不仅可以反映激光与物质相互作用的细节，而且可以提供明亮的太赫兹波源。流动液体靶具有为每个激光脉冲提供新鲜区域的优点。为了证明激光激发下的无碎片目标，我们研究了液氮作为目标的使用。通过在周围环境中创建流动的液氮线，我们成功地观察到宽带太赫兹波短脉冲激发下的发射。我们的低温生产线能够承受高重复频率（1 kHz）激光的激发。从液氮发射的太赫兹峰值场与从液态水发射的太赫兹峰值场相当，但观察到更宽的带宽。这一演示提示的机会，在选择潜在的材料研究太赫兹波的产生过程，并在了解不同的液体的激光诱导电离。
Terahertz wave emission from liquids excited by intense laser pulses not only reflects the details in laser-matter interaction but also offers bright terahertz wave sources. Flowing liquid targets possess the advantage of providing a fresh area for each laser pulse. To demonstrate a debris-free target under laser excitation, we investigate the use of liquid nitrogen as a target. By creating a flowing liquid nitrogen line in an ambient environment, we successfully observe broadband terahertz wave emission under short pulse excitation. Our cryogenic line is able to sustain the excitation of a high-repetition-rate (1 kHz) laser. The terahertz peak field emitted from liquid nitrogen is comparable to that from liquid water, yet a broader bandwidth is observed. This demonstration prompts opportunities in choosing potential materials for studying terahertz wave generation processes and in understanding laser-induced ionization of different liquids.