太赫兹辐射
激光器
光学
双折射
极化(电化学)
宽带
圆极化
材料科学
照相混合
光电子学
相位板
远红外激光器
物理
太赫兹超材料
化学
微带线
物理化学
作者
Linzheng Wang,Zhelin Zhang,Tianhao Xia,Yanping Chen,Zheng-Ming Sheng
出处
期刊:Journal of The Optical Society of America B-optical Physics
[The Optical Society]
日期:2022-01-28
卷期号:39 (3): A68-A68
被引量:3
摘要
Effective manipulation of broadband terahertz emission, especially on spectrum tuning, is of great importance for many applications. We demonstrate a method to realize frequency tuning of terahertz emissions from two-color laser-induced air plasmas. The terahertz central frequency is switched from 0.56 to 0.82 THz by changing the polarization state of the fundamental wave with a quarter-wave plate. Based on numerical simulation, it is found that this frequency tuning is due to the birefringence effect induced by the fundamental wave on the second harmonic inside the filament, which leads to a discrepancy on the polarization chirality of the two-color laser components. Two-color lasers with opposite chirality will emit terahertz radiation with higher central frequency compared to two-color lasers with the same chirality at moderate laser intensity.
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