Two-Colour Free Electron Laser with Wide Frequency Separation using a Single Monoenergetic Electron Beam

TL;DR

This paper demonstrates a two-colour free electron laser using a single monoenergetic electron beam, achieving simultaneous strong bunching at two well-separated frequencies through alternating undulator modules.

Contribution

It introduces a novel two-colour FEL configuration with wide frequency separation using a single electron beam and demonstrates its effectiveness with simulation results.

Findings

Strong electron bunching at two resonant frequencies

Generation of bunching at sum and difference frequencies

Feasibility shown via simulation with Puffin

Abstract

Studies of a broad bandwidth, two-colour FEL amplifier using one monoenergetic electron beam are presented. The two-colour FEL interaction is achieved using a series of undulator modules alternately tuned to two well-separated resonant frequencies. Using the broad bandwidth FEL simulation code Puffin, the electron beam is shown to bunch strongly and simultaneously at the two resonant frequencies. Electron bunching components are also generated at the sum and difference of the resonant frequencies.