Spectral Measurements from a Tunable, Raman, Free-Electron Laser

Abstract

We report narrow-band spectra ($\frac{\Delta \omega }{\omega }\approx 0.02$) from a tunable ($7<~\frac{\omega }{2\pi }<~18$ GHz), Raman, free-electron laser operating in a single T${\mathrm{E}}_{11}$ waveguide mode. rf power levels of 100 kW at an efficiency of ∼ 12% have been achieved. Measured dispersion characteristics are in good agreement with theory.