Patent ID: 6448850
Filing Date: 2002-09-10
Classification: H01S

Abstract:
An electromagnetic wave amplifier arranged in a vacuum environment, comprising:an electron emitting section for emitting electron beams; and an amplifying section for amplifying an inputted electromagnetic wave in one direction by utilizing energy received from an electron beam emitted from the electron emitting section and travelling in the vacuum, the amplifying section comprising: a dielectric substrate having a dielectric waveguide disposed thereon in an electron beam travelling direction, the surface of the dielectric waveguide having a wave shaped form of a given periodic length so as to decrease the travelling speed of the electromagnetic wave in the electron beam travelling direction; and a pair of electron beam focusing electrodes oppositely arranged to clip the dielectric waveguide, the dielectric waveguide causing an electric field component of the electromagnetic wave in the electron beam travelling direction by overlapping a part of the inputted electromagnetic wave and the electron beam emitted from the electron emitting section.