# Thomson backscattering in combined two laser and magnetic field

## TL;DR

This paper investigates Thomson backscattering of electrons in combined laser and magnetic fields, revealing how dual laser fields and magnetic influence can enhance and control emission spectra.

## Contribution

It introduces a dynamically assisted mechanism with two laser fields and a magnetic field, demonstrating enhanced and tunable backscattering spectra compared to single laser setups.

## Key findings

- Peak emission frequency is significantly increased with two lasers and magnetic field.
- Spectrum and radiation frequency improve with higher weak laser frequency.
- Nonlinear correlation between backscattering intensity and weak laser intensity.

## Abstract

The Thomson backscattering of an electron moving in combined fields is studied by a dynamically assisted mechanism. The combined fields are composed of two co-propagating laser fields and a magnetic field, where the first laser field is strong and low-frequency while the second is weak and high-frequency, relatively. The dependence of fundamental frequency of emission on the ratio of incident laser high-to-low frequency is presented and the spectrum of backscattering is obtained. It is found that, with a magnetic field, the peak of the spectrum and the corresponding radiation frequency are significantly larger in case of two-laser than that in case of only one laser. They are also improved obviously as the frequency of the weak laser field. Another finding is the nonlinear correlation between the emission intensity of the backscattering and the intensity of the weak laser field. These results provide a new possibility to adjust and control the spectrum by changing the ratios of frequency and intensity of the two laser fields.