Relativistic plasma aperture for laser intensity enhancement

TL;DR

This paper demonstrates that a relativistic plasma aperture can significantly enhance local laser intensity, potentially enabling advanced strong field QED experiments with current laser technology.

Contribution

It provides analytical and numerical analysis of laser intensity enhancement via a relativistic plasma aperture, a novel approach for increasing laser field strength.

Findings

Laser intensity can be increased by roughly an order of magnitude.

The effect depends on relativistically induced transparency and specific laser-target parameters.

Simulation results align with theoretical estimates.

Abstract

A substantial increase in local laser intensity is observed in the near field behind a plasma shutter.This increase is caused by the interference of the diffracted light at the relativistic plasma aperture and it is studied both analytically and using numerical simulations. This effect is only accessible in the regime of relativistically induced transparency and thus it requires a careful choice of laser and target parameters. The theoretical estimates for the maximum field strength and its spatial location as a function of target and laser parameters are provided and compared with simulation results. Our full 3D Particle-in-Cell simulations indicate that the laser intensity may be increased roughly by an order of magnitude improving the feasibility of strong field QED research with the present generation of lasers.