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arXiv physics/0306197physics.plasm-phphysics.atom-ph
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相干和非相干等离子体辐射的研究:等离子体波激发和破碎的作用

Study of Coherent and Incoherent Plasma Emissions: Role of Plasma Wave Excitation and Breaking

Arvinder S. Sandhu, G. Ravindra Kumar, S. Sengupta, A. Das, P. K. Kaw

摘要:

在这里,我们实验映射的电子等离子体波在激光固体相互作用的动力学。我们做了时间分辨测量的二次谐波和硬X射线产生的相互作用的强($10^{16} W cm^{-2}$,100 fs,800 nm)激光与固体表面上产生的预等离子体。在这个时间分辨研究中探索的参数空间包括尺度长度、激光偏振和激光强度的变化。这些测量一起完成带来了强驱动的电子等离子体波行为的新功能,这还没有被实验探索到目前为止。我们根据共振吸收和破波机制对结果进行建模。谐波和X射线发射显示出对比的行为,这表明试图通过蛮力来提高谐波效率的陷阱。然而,通过简单的调整,我们观察到,硬X射线可以增强或控制高达两个数量级和二次谐波高达一个数量级的最佳条件下。这些结果将有助于我们理解短波长产生和快速粒子产生的控制机制,以开发更有效的应用源。

英文摘要:

Here we experimentally map the dynamics of electron plasma waves in laser solid interaction. We do time resolved measurements of second harmonic and hard X-ray generation from interaction of intense ($10^{16} W cm^{-2}$, 100 fs, 800nm) laser with a pre-plasma generated on a solid surface. The parameter space explored in this time resolved study includes variation of scale length, laser polarization and laser intensity in conjunction. These measurements done together brings novel features of strongly driven electron plasma wave behavior, which have not been explored experimentally so far. We model the results in terms of Resonance Absorption and Wave-Breaking mechanisms. The Harmonic and X-ray emission show contrasting behaviour, which indicates pitfalls in trying to increase harmonic efficiencies by brute force. However by simple adjustments, we observe that hard X-rays can be enhanced or controlled upto two orders of magnitude and second harmonic upto one order of magnitude under optimum conditions. These results should help us understand the governing mechanisms for short wavelength generation and fast particle generation to develop more efficient sources for application purposes.

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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