The Cockcroft Institute, Keckwick Lane, Daresbury WA4 4AD, United Kingdom.
Physics Department, Lancaster University, Lancaster LA1 4YB, United Kingdom.
Phys Rev Lett. 2018 Jun 22;120(25):254801. doi: 10.1103/PhysRevLett.120.254801.
We report on the depletion and power amplification of the driving laser pulse in a strongly driven laser wakefield accelerator. Simultaneous measurement of the transmitted pulse energy and temporal shape indicate an increase in peak power from 187±11 TW to a maximum of 318±12 TW after 13 mm of propagation in a plasma density of 0.9×10^{18} cm^{-3}. The power amplification is correlated with the injection and acceleration of electrons in the nonlinear wakefield. This process is modeled by including a localized redshift and subsequent group delay dispersion at the laser pulse front.
我们报告了强驱动激光尾流加速器中驱动激光脉冲的损耗和功率放大。透射脉冲能量和时间形状的同时测量表明，在等离子体密度为 0.9×10^{18} cm^{-3}的情况下，传播 13 毫米后，峰值功率从 187±11 TW 增加到最大值 318±12 TW。功率放大与非线性尾流中电子的注入和加速相关。通过在激光脉冲前端包含局部红移和随后的群延迟色散，该过程可以用模型表示。
