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Photon acceleration and modulational instability during wakefield excitation using long laser pulses

机译：使用长激光脉冲的尾场激发过程中的光子加速和调制不稳定性

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摘要

The modulational instability that occurs during the interaction of a long laser pulse and its own wakefield in an underdense plasma has been studied experimentally and theoretically. Recent experiments using laser pulses that are several times longer than the wakefield period have yielded transmission spectra that exhibit a series of secondary peaks flanking the main laser peak. These peaks are too closely spaced to be the result of Raman instabilities; their origin was found to be photon acceleration of the laser's photons in the wakefield instead. In the experiments described in this paper, a laser pulse of 50-200 fs containing 300-600 mJ was focused on the edge of a helium gas jet on a 25 mu m focal spot. The observed transmission spectra show evidence of both ionization blueshift and modulation by the pulse's wakefield. The transmission spectra have also been modelled using a dedicated photon-kinetic numerical code. The modelling has revealed a direct correlation between the spectral modulations and the amplitude of the excited wakefield. By comparing the measured and simulating spectra, the origin of various spectral characteristics has been explained in terms of photon acceleration. The feasibility of using this effect as a wakefield diagnostic will be discussed.
机译：已经在实验和理论上研究了长激光脉冲与其自身的尾波场在低密度等离子体相互作用期间发生的调制不稳定性。最近使用比尾场周期长几倍的激光脉冲进行的实验已经产生了透射光谱，该光谱显示出一系列位于主激光峰两侧的次级峰。这些峰之间的距离太近，以致于拉曼不稳定。发现它们的起源是在尾场中激光的光子的光子加速。在本文所述的实验中，将包含300-600 mJ的50-200 fs的激光脉冲聚焦在25 µm焦点上的氦气喷嘴边缘。观察到的透射光谱显示出电离蓝移和脉冲的尾波场调制的证据。还使用专用的光子动力学数字代码对透射光谱进行了建模。建模揭示了频谱调制与激发的尾波场的幅度之间存在直接的相关性。通过比较测得的光谱和模拟光谱，已根据光子加速度解释了各种光谱特征的起源。将讨论使用这种效应作为尾场诊断的可行性。

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