Raman spectra and the Los Alamos free-electron laser

Spectra have been obtained of the light generated near 10 μm by the Los Alamos free-electron laser. The spectra contain a main line and copious sidebands, mostly to the long-wavelength side of the main line. The spectra vary in overall width as the detuning parameter is altered or as the sidebands are preferentially allowed to escape the optical cavity. A comparison is made between these measurements and the results of numerical simulations.