Apparatus and method for generating femtosecond electron beams

摘要

An apparatus and method for generating a femtosecond electron beam are disclosed. The apparatus discharges electrons 10 generated via a cathode 100 to an anode 300. The cathode 100 includes a transmission windouT 150 to allow an incident laser L to pass through and a pinhole 350 is formed in the anode 300 corresponding to the position of the electrons 10 generated from the transmission window 150. This pinhole 350 allows passage of the electrons there through. A focusing unit 200 is provided at one side of the cathode 100 between the cathode 100 and the anode 300 and generates an electric field to accelerate and at the same time concentrate the electrons 10 to the pinhole 350. This allows for the shortening of the device and the generation of femtosecond electron beams.