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Effects of Laser Polarization and Color on Hybrid Laser Wakefield and Direct Acceleration

机译:激光偏振和颜色对混合激光Wakefield和激光的影响   直接加速

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摘要

We demonstrate that hybrid laser wakefield and direct acceleration (LWDA) canbe significantly improved by using two laser pulses with differentpolarizations or frequencies. The improvement entails higher energy and chargeof the accelerated electrons, as well as weaker sensitivity to the time delaybetween the leading (pump) pulse responsible for generating the wakefield, andthe trailing laser pulse responsible for direct laser acceleration (DLA). Whenthe two laser pulses have the same frequency, it is shown that it isadvantageous to have their polarization states orthogonal to each other. Aspecific scenario of a frequency-doubled ($\lambda_{\rm DLA}=\lambda_{\rmpump}/2$) DLA laser pulse is also considered, and found to be an improvementover the single-frequency ($\lambda_{\rm DLA} = \lambda_{\rm pump}$) scenario.
机译:我们证明,通过使用两个偏振或频率不同的激光脉冲,可以显着改善混合激光尾流和直接加速(LWDA)。这种改进需要更高的能量和加速电子的电荷,以及对负责产生尾波场的前导(泵浦)脉冲和后退激光脉冲(用于直接激光加速)之间的时间延迟的敏感性较弱。当两个激光脉冲具有相同的频率时,表明使它们的偏振态彼此正交是有利的。还考虑了倍频($ \ lambda _ {\ rm DLA} = \ lambda _ {\ rmpump} / 2 $)DLA激光脉冲的特定情况,发现它比单频($ \ lambda _ {\ rm DLA} = \ lambda _ {\ rm pump} $)方案。

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