Polarization control of terahertz radiation from two-color femtosecond gas breakdown plasma.
Polarization control of terahertz radiation from two-color femtosecond gas breakdown plasma.
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DOI：
10.1364/ol.43.000090
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发表时间：
2018
期刊：
影响因子：
3.6
通讯作者：
O. Kosareva;M. Esaulkov;N. Panov;V. Andreeva;D. Shipilo;P. Solyankin;A. Demircan;I. Babushkin;V. Makarov;U. Morgner;A. Shkurinov;A. Savel’ev
中科院分区：
文献类型：
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作者：
O. Kosareva;M. Esaulkov;N. Panov;V. Andreeva;D. Shipilo;P. Solyankin;A. Demircan;I. Babushkin;V. Makarov;U. Morgner;A. Shkurinov;A. Savel’ev
我们分别控制了800和400 nm光束的偏振，它们在空气中形成双色飞秒等离子体灯丝，照射线性到椭圆的太赫兹信号。我们在基场和次谐波场偏振方向之间的~ 85°角处检测到太赫兹椭圆率的阈值样外观。模拟结果证实了太赫兹极化的突变，并揭示了二次谐波的弱椭圆性足以产生本质上椭圆的太赫兹辐射。
We individually control polarizations of 800 and 400 nm beams, which form a two-color femtosecond plasma filament in air irradiating a linear-to-elliptical THz signal. We detected a threshold-like appearance of THz ellipticity at the angle of ∼85° between the fundamental and second-harmonic field polarization directions. The simulations confirm the abrupt change of THz polarization and reveal that the weak ellipticity of the second harmonic is sufficient to generate essentially elliptical THz radiation.