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arXiv 2408.04892physics.plasm-ph
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近临界密度靶的激光触发太赫兹发射

Laser-triggered THz emission from near critical density targets

V. Yu. Bychenkov, A. V. Brantov, M. G. Lobok, A. S. Kuratov

AI总结:

本文利用近临界密度等离子体中的相对论自捕获效应增强电子加速与相干渡越辐射,并通过三维PIC模拟证明其可由2 J飞秒脉冲产生能量超过100 mJ的准单极太赫兹脉冲。

摘要:

飞秒激光脉冲在近临界密度等离子体中的相对论自捕获(RST)状态下传播,能够使加速电子的总电荷量以及激光到电子的转换率最大化,这可用于提供大量太赫兹频段的相干渡越辐射。三维粒子模拟(PIC)展示了当电子从低密度靶本身逸入真空,或在穿过位于靶末端的薄箔后逸入真空时,这种渡越辐射是如何产生的。与激光辐照正面带有预等离子体的箔这种标准靶相比,RST状态在产生太赫兹脉冲方面的优势得到了明确证明。所进行的模拟表明,对于优化的激光-靶匹配,2 J飞秒激光脉冲能够产生能量超过100 mJ的准单极太赫兹脉冲。

英文摘要:

Femtosecond laser pulse propagation in a relativistic self-trapping regime (RST) in a near-critical density plasma makes it possible to maximize the total charge of the accelerating electrons and laser-to-electrons conversion rate, that can be used to provide a large amount of the THz range coherent transition radiation. The three-dimensional particle-in-cell simulations demonstrate how such transition radiation generates when electrons escape into vacuum either from the low-density target itself, or after passing through a thin foil located at the target end. Advantage of the RST regime for generation of THz pulses is clearly demonstrated as compared to laser irradiation of such a standard target as a foil with preplasma on its front side. Simulation performed has shown that for the optimized laser-target matching a 2-J femtosecond laser pulse is able to produce quasi-unipolar Thz pulses with energy exceeding 100 mJ.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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