Stable attosecond electron bunches from a nanofiber driven by Laguerre-Gaussian lasers

TL;DR

This paper proposes a novel all-optical method using Laguerre-Gaussian lasers to generate stable, dense attosecond electron bunches with high charge and angular momentum from nanofibers, advancing ultrafast physics and radiation sources.

Contribution

It introduces a new scheme employing LG laser pulses interacting with nanofibers to produce stable, phase-locked attosecond electron bunches with high charge and angular momentum.

Findings

Stable attosecond electron bunches achieved with LG laser and nanofiber

Bunches are phase-locked and have low divergence

Potential for ultrabrilliant attosecond x/$\\gamma$-ray emission

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 sub-femtosecond electron bunches from laser-plasma interactions either carry low beam charge, or propagate for only several tens of femtoseconds. 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. The stable 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/$\gamma$-ray emission.