Abstract
Infrared radiation produced by a fully relativistic, 3.6 MeV, electron beam passing close to a metal grating has been observed and the radiated power estimated by direct comparison with a high pressure mercury vapour lamp. The dependence of wavelength on angle of emission, over angles from 56° to 150° and wavelengths from 350 μm to 1860 μm, agrees remarkably well with the Smith Purcell dispersion relation. The observed radiated power of about 10 μW/cm 2 sr A for a 100 μm band width at a wavelength of 1 mm is comparable with or greater than that typical for infrared beam lines at synchrotrons, and also suggests that the Smith Purcell mechanism deserves greater attention as a possible basis for FEL operation in the mm and sub-mm wavelength bands.
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