# Highly efficient laser-driven Compton gamma-ray source

## TL;DR

This paper introduces a highly efficient laser-driven Compton gamma-ray source using a plasma device, achieving significantly higher conversion efficiency and spectral intensity than previous methods, with potential for various applications.

## Contribution

The authors propose a novel scheme combining plasma lens and plasma mirror to greatly enhance gamma-ray production efficiency and intensity, demonstrated through particle-in-cell simulations.

## Key findings

- Achieves gamma-ray conversion efficiency >10^{-2}
- Spectral intensity around 10^9 photons/0.1%BW
- Compatible with current petawatt lasers

## Abstract

The recent advancement of high-intensity lasers has made all-optical Compton scattering become a promising way to produce ultra-short brilliant $\gamma$-rays in an ultra-compact system. However, so far achieved Compton $\gamma$-ray sources are severely limited by low conversion efficiency (lower than $10^{-5}$) and spectral intensity ($\sim10^{4}$ ${\rm photons/0.1\%BW}$). Here we present a highly efficient gamma photon emitter obtained by irradiating a high-intensity laser pulse on a miniature plasma device consisting of a plasma lens and a plasma mirror. This concept exploits strong spatiotemporal laser-shaping process and high-charge electron acceleration process in the plasma lens, as well as an efficient nonlinear Compton scattering process enabled by the plasma mirror. Our particle-in-cell simulations demonstrate that in this novel scheme, brilliant $\gamma$-rays with very high conversion efficiency (higher than $10^{-2}$) and spectral intensity ($\sim10^{9}$ ${\rm photons/0.1\%BW}$) can be achieved by employing currently available petawatt-class lasers with intensity of $10^{21}$ ${\rm W/cm^2}$. Such efficient and intense $\gamma$-ray sources would find applications in wide-ranging areas.