Quasi-matched propagation of high-intensity, ultra-short laser pulses in plasma channels
Quasi-matched propagation of high-intensity, ultra-short laser pulses in plasma channels
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高强度、超短激光脉冲在等离子体通道中的准匹配传播
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
W. Leemans
中科院分区：
文献类型：
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作者：
C. Benedetti;C. Schroeder;E. Esarey;W. Leemans
通过非线性近轴波动方程研究等离子体通道中短而强的激光脉冲的传播。获得了描述准匹配激光传播的解析条件（即，当激光脉冲的二阶归一化强度加权横向力矩保持恒定时）。对于通道中的任意时间激光脉冲轮廓和任何规定的横向密度轮廓，我们确定沿脉冲的激光强度分布，即切片相关的激光腰，确保准匹配传播。对于高斯激光器在整个脉冲中最初具有均匀光斑的情况，我们确定了最小化光斑尺寸振荡的最佳通道深度。通过与数值模拟的比较，验证了两种情况下获得的解析和半解析结果。
The propagation of a short and intense laser pulse in a plasma channel is investigated through the nonlinear paraxial wave equation. An analytic condition describing quasi-matched laser propagation (i.e., when the second order normalized-intensity-weighted transverse moment of the laser-pulse remain constant) is obtained. For any arbitrary temporal laser pulse profile and any prescribed transverse density profile in the channel, we determine the laser intensity distribution along the pulse, i.e., the slice-dependent laser waist, ensuring quasi-matched propagation. For the case of a Gaussian laser with an initially uniform spot throughout the pulse, we determine the optimal channel depth that minimizes spot size oscillations. The analytical and semi-analytical results obtained for both cases are validated through comparison with numerical simulations.