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来自双色激光场诱导的空气等离子丝的反向THz发射

Yuxuan Chen¹, Yuhang He¹, Liyuan Liu¹

¹Center for Terahertz Waves and School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China.

Sensors (Basel, Switzerland)

|July 11, 2023

概括

研究了来自双色激光诱导等离子体丝的反向太赫兹 (THz) 波辐射. 一个模型预测较长的等离子体具有较少的后退THz发射,经过实验证实,表明THz成像和遥感中的应用.

科学领域:

物理物理学物理
光学是什么?光学是什么?光学是什么?
等离子体物理学的物理学

背景情况:

双色激光场诱导等离子体丝,作为高效的宽带太赫兹 (THz) 源.
强烈的THz波主要是向前方向发射,反向发射的研究较少.

研究的目的:

从理论和实验上研究来自双色激光诱导等离子体纤维的反向太赫兹 (THz) 波辐射.
探索等离子线长度与反向THz发射之间的关系.
了解前向和后向排放THz生成机制.

主要方法:

使用线性双极阵列模型进行理论建模.
实验设置用于从~5毫米的等离子体导线产生和检测反向THz辐射.
分析THz波形,频谱和峰值THz电场对激光脉冲能量的依赖.

主要成果:

一种线性二极管阵列模型预测,随着等离子体丝长度的增长,背向THz波的比例会降低.
对反向THz辐射的典型波形和频谱的实验观测.
峰值THz电场对激光能量的依赖表明前向和后向THz波的产生过程类似.
在THz波形中观察到的峰值时间变化表明由于非线性聚焦效应而导致的等离子体位置变化.

结论:

这项研究提供了对双色激光诱导等离子体丝的逆向THz辐射的见解.
实验发现与有关等离子体长度影响的理论预测一致.
这些发现表明THz成像和遥感的潜在应用.

关键词:

这就是THz波浪的产生.激光诱导的空气等离子体灯丝.双色激光场是一个双色激光场.

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