Abstract

Based on the photocurrent model, we theoretically investigate the terahertz (THz) radiation in gas plasma driven by monochromatic chirp laser pulse. It is shown that the trajectories of the ionized electrons can be controlled effectively and can form a larger net residual current in a chirped field. As a result, the radiated THz yield can be dramatically improved by nearly more than two orders of magnitude than that of few-cycle chirp-free laser field. Furthermore, with the THz yield dependence on the laser intensity, wavelength and pulse width of the drivers carefully investigated, some noticeable differences between chirped field and chirp-free pulse are observed.

中文翻译：

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通过线性调频激光场控制电子轨迹增强太赫兹产生

摘要

基于光电流模型，我们从理论上研究了单色啁啾激光脉冲驱动的气体等离子体中的太赫兹（THz）辐射。结果表明，电离电子的轨迹可以得到有效控制，并且可以在啁啾场中形成较大的净剩余电流。因此，与少周期无啁啾激光场相比，辐射的太赫兹产量可以显着提高近两个数量级以上。此外，通过仔细研究太赫兹产量对激光强度、波长和驱动器脉冲宽度的依赖性，观察到啁啾场和无啁啾脉冲之间的一些显着差异。