The terahertz wave packet emission theory is constructed when an s-polarized laser pulse is incident on a semi-infinite plasma whose density is much lower than the critical value. The angular, spectral and energy characteristics of a terahertz pulse are studied as a function of the plasma density, the angle of incidence and the duration of laser radiation. It is shown that the energy of the terahertz signal has the maximum value at the fall of the laser pulse at grazing angles, when the effect of total reflection of the laser radiation from the plasma boundary takes place.

中文翻译：

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激光脉冲斜入射在稀薄等离子体上的太赫兹波发射

当s偏振激光脉冲入射到密度远低于临界值的半无限等离子体时，建立了太赫兹波包发射理论。作为等离子体密度、入射角和激光辐射持续时间的函数，研究了太赫兹脉冲的角度、光谱和能量特性。结果表明，当发生等离子体边界的激光辐射全反射效应时，太赫兹信号的能量在激光脉冲在掠角处下降时具有最大值。