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首页> 外文期刊>Journal of Nuclear Physics, Material Sciences, Radiation and Applications >Third harmonic generation of a short pulse laser in a tunnel ionizing plasma: Effect of self-defocusing
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Third harmonic generation of a short pulse laser in a tunnel ionizing plasma: Effect of self-defocusing

机译：隧道电离等离子体中短脉冲激光的三次谐波产生：自散焦的影响

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摘要

Third harmonic generation of a Gaussian short pulse laser in a tunnel ionizing plasma is investigated. A Gaussian short pulse laser propagating through a tunnel ionizing plasma generates third harmonic wave. Inhomogeneity of the electric ield along the wavefront of the fundamental laser pulse causes more ionization along the axis of propagation while less ionization off axis, leading to strong density gradient with its maximum on the axis of propagation. The medium acts like a diverging lens and pulse defocuses strongly. The normalized third harmonic amplitude varies periodically with the distance with successive maxima acquiring lower value. The self-defocusing of the fundamental laser pulse decays the intensity of the third harmonic pulse.
机译：研究了隧道电离等离子体中高斯短脉冲激光的三次谐波产生。通过隧道电离等离子体传播的高斯短脉冲激光产生三次谐波。沿基本激光脉冲波前产生的电场的不均匀性会导致沿传播轴发生更多的电离，而导致沿离轴发生更少的电离，从而导致强密度梯度，在传播轴上出现最大值。介质的作用就像发散的透镜，脉冲强烈散焦。归一化的三次谐波幅度随着距离而周期性地变化，连续的最大值获得较低的值。基本激光脉冲的自散焦使三次谐波脉冲的强度衰减。

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