Electron Pulse Compression with Optical Beat Note

TL;DR

This paper introduces a novel method for compressing electron pulses using optical beat notes, enhancing optical control in electron beam systems and revealing continuous frequency changes in electron charge density during drift.

Contribution

It proposes using optical beat notes for electron pulse compression and uncovers continuous frequency variation in electron charge density during drift.

Findings

Optical beat notes can effectively compress electron pulses.

Electron charge density frequency varies continuously along drift.

Potential for improved coherent interactions in electron systems.

Abstract

Compressing electron pulses is important in many applications of electron beam systems. In this study, we propose to use optical beat notes to compress electron pulses. The beat frequency is chosen to match the initial electron pulse duration, which enables the compression of electron pulses with a wide range of durations. This functionality extends the optical control of electron beams, which is important in compact electron beam systems such as dielectric laser accelerators. We also find that the dominant frequency of the electron charge density changes continuously along its drift trajectory, which may open up new opportunities in coherent interaction between free electrons and quantum or classical systems.