Broadband optical gain via interference in the free electron laser: Principles and proposed realizations

Abstract

We propose experimentally simplified schemes of an optically dispersive interface region between two coupled free electron lasers (FELs), aimed at achieving a much broader gain bandwidth than in a conventional FEL or a conventional optical klystron composed of two separated FELs. The proposed schemes can universally enhance the gain of FELs, regardless of their design when operated in the short pulsed regime.

Numerical Experiments on Free-Electron Lasers Without Inversion

“…[15], where the effect of the drift region has been taken into account by the phase shifts. The finite emittance of the electron beam has not been taken into account in [13,14,15,20].…”