Attosecond electron bunches from a nanofiber driven by Laguerre-Gaussian laser pulses

Attosecond electron bunches from a nanofiber driven by Laguerre-Gaussian laser pulses

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Abstract Generation of attosecond bunches of energetic electrons offers significant potential from ultrafast physics to novel radiation sources.However, it is still a great challenge to stably produce such electron beams with lasers, since the typical subfemtosecond electron bunches from laser-plasma interactions either carry low beam charge, or propagate for only several tens of femtoseconds.
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.Here we propose an all-optical scheme for generating dense attosecond electron bunches via the interaction of an intense Laguerre-Gaussian (LG) laser pulse with a nanofiber.
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.The dense bunch train results from the unique field structure of a circularly polarized LG laser pulse, enabling each bunch to be phase-locked and accelerated forward with low divergence, high beam charge and large beam-angular-momentum.

This paves the way for wide applications in various fields, e.g., ultrabrilliant attosecond x/γ-ray emission