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## Observation of power amplification in a self-injecting laser wakefield accelerator

Research output: Contribution to journalJournal article

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• M. J. V. Streeter
• S. Kneip
• M. S. Bloom
• R. A. Bendoyro
• O. Chekhlov
• A. E. Dangor
• A. Döpp
• C. J. Hooker
• J. Holloway
• J. Jiang
• N. C. Lopes
• H. Nakamura
• P. A. Norreys
• C. A. J. Palmer
• P. P. Rajeev
• J. Schreiber
• D. R. Symes
• M. Wing
• S. P. D. Mangles
• Z. Najmudin
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Journal publication date 15/10/2017 arXiv.org Published English

### 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 $187 \pm 11$TW to a maximum of $318 \pm 12$ TW after 13 mm of propagation in plasma density of $0.9 \times 10^{18}$ cm$^{-3}$. The power amplification is correlated with the injection and acceleration of electrons in the non-linear wakefield. This process is modeled by including localized redshifting and subsequent group delay dispersion at the laser pulse front.

### Bibliographic note

6 pages, 3 figures. To be submitted to PRL