3 years ago

Laser wakefield acceleration with mid-IR laser pulses.

V. Shumakova, L. Feder, A. Baltuška, R. Schwartz, C. Gollner, A. Korolov, H. M. Milchberg, F. Salehi, B. Miao, D. Woodbury, A. Pugžlys

We report on the first results of laser plasma wakefield acceleration driven by ultrashort mid-infrared laser pulses (\lambda= 3.9 \mu m, 100 fs, 0.25 TW), which enable near- and above-critical density interactions with moderate-density gas jets. Relativistic electron acceleration up to ~12 MeV occurs when the jet width exceeds the threshold scale length for relativistic self-focusing. We present scaling trends in the accelerated beam profiles, charge and spectra, which are supported by particle-in-cell simulations and time-resolved images of the interaction. For similarly scaled conditions, we observe significant increases in accelerated charge compared to previous experiments with near-infrared (\lambda=800 nm) pulses.

Publisher URL: http://arxiv.org/abs/1801.05241

DOI: arXiv:1801.05241v2

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