Effect of the frequency chirp on laser wakefield acceleration

TL;DR

This paper investigates how laser frequency chirps influence wakefield acceleration, showing that chirps can optimize pulse compression, electron trapping, and wakefield control, leading to improved acceleration outcomes.

Contribution

It demonstrates the effects of laser frequency chirps on wakefield acceleration in both linear and blowout regimes, supported by multi-dimensional PIC simulations.

Findings

Chirped pulses increase self-trapped electrons by 15%.

Chirped pulses yield 10% higher peak energies.

Chirps enable control over wake phase velocity and guiding conditions.

Abstract

The role of laser frequency chirps in the laser wakefield accelerator is examined. We show that in the linear regime, the evolution of the laser pulse length is affected by the frequency chirp, and that positive (negative) chirp compresses (stretches) the laser pulse, thereby increasing (decreasing) the peak vector potential and wakefield amplitude. In the blowout regime, the frequency chirp can be used to fine tune the localized etching rates at the front of the laser. In our simulations, chirped laser pulses can lead to 15% higher self-trapped electrons, and 10% higher peak energies as compare to the transform-limited pulse. Chirps may be used to control the phase velocity of the wake, and to relax the self-guiding conditions at the front of the laser. Our predictions are confirmed by multi-dimensional particle-in-cell simulations with OSIRIS.