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首页> 外文期刊>Plasma physics and controlled fusion >THz generation by two-color femtosecond filaments with complex polarization states: four-wave mixing versus photocurrent contributions
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THz generation by two-color femtosecond filaments with complex polarization states: four-wave mixing versus photocurrent contributions

机译：THz由两种偏振态的双色飞秒细丝产生：四波混合与光电流贡献

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摘要

Two-color filamenation in gases is known to produce intense and broadband THz radiation. There are two physical mechanisms responsible for the THz generation in this scheme: four-wave mixing and emission from the induced plasma currents. The case when the main and second harmonic are linearly polarized is well studied including the impact from each of the above mechanisms. However, for the cases when the two-color fields have complex polarization states the role of the four-wave mixing and plasma mechanisms in the formation of the THz polarization is still under-explored. Here we use both the four-wave mixing and photocurrent models in order to consider the THz generation by two-color fields with arbitrary polarizations. We show that under specific polarizations of the two-color field components it is possible to determine which of the mechanisms is responsible for the THz polarization formation.
机译：已知在气体中的双色纺丝产生强烈和宽带THz辐射。 该方案中的THz生成有两种身体机制：来自诱导等离子体电流的四波混合和发射。 当主和二次谐波是线性偏振的情况很好地研究了包括上述每个机制的冲击。 然而，对于两种颜色的情况具有复杂的偏振状态，仍然探讨了四波混合和等离子体机制的作用。 在这里，我们使用四波混合和光电流模型，以便通过双色字段考虑具有任意偏振的两种颜色字段。 我们表明，在双色场分量的特定偏振下，可以确定哪个机制对THz偏振形成负责。

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