Measurements of the inverse Smith-Purcell effect at submillimeter wavelengths

The inverse Smith-Purcell effect was observed to verify the theoretical predictions for the dependence of the size of the interaction space on the laser wavelength. Two submillimeter wave lasers with wavelengths of 184.6 mu m and 496 mu m were used as the driving lasers. It was found that the interaction strength for the driving laser with shorter wavelength decays more rapidly than that for the longer wavelength driving laser, as is predicted by theory. Measured decay constants of the field intensity have shown good agreement with theoretical values.<>