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Observation of Laser Power Amplification in a Self-Injecting Laser Wakefield Accelerator
M J V Streeter1,2,3, S Kneip3, M S Bloom3
1The Cockcroft Institute, Keckwick Lane, Daresbury WA4 4AD, United Kingdom.
Abstract:
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.
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