Patent ID: 8958444
Filing Date: 2015-02-17
Classification: H01S

Abstract:
1. Device ( 100 ; 200 ) for generating a coherent Smith-Purcell radiation comprising: an electrically conducting diffraction grating ( a source ( at least one electrically conducting intermediate wall ( the speed of the electrons is low enough so that a straight line (l), drawn in a dispersion diagram in which the frequency (f) is expressed as a function of the wave number (k), representing the frequency of the electron beam as a function of its wave number, intersects a curve (V) representing the dispersion relation in three dimensions corresponding to a fundamental mode of the elementary diffraction grating ( passing through the origin of said dispersion diagram, in which c is the speed of light in vacuum; and a current density of the electron beam is sufficiently high to excite the fundamental mode of each elementary diffraction grating (