Title:
ELECTRON GUN FOR EMITTING ELECTRON BEAMS MODULATED BY OPTICAL DEVICE
Document Type and Number:
Japanese Patent JPH02260352
Kind Code:
A
Abstract:
PURPOSE: To correct defects of an electron gun caused by its employment of laser pulses to excite its cathode and thus resolve its constraints in performance by substituting a light modulator interposed between its light source and photocathode for the laser. CONSTITUTION: An electron gun comprises a photocathode 1 and a light source 11 of incoherent light for emitting light beams 2 modulated by a light modulator. The light modulator is typically an active polarizing modulation element 15 arranged between a polarizer 13 and a filter 14. Emitted light beams are focused on the photocathode by means of an optical, means 19 typically comprising a lens. The lasertron employing the light source of incoherent light modulated by the light modulator thus has a far higher frequency because of the light modulation, the photoelectric efficiency of the system is improved depending on the type of a light source selected, and the system may be used as an RF amplifier because light modulation is obtained from RF signals, among other various advantages.
Inventors:
JIYORUJIYU FUAIYON
AREKUSHISU DEYUBUROBAN
AREKUSHISU DEYUBUROBAN
Application Number:
JP3507290A
Publication Date:
October 23, 1990
Filing Date:
February 15, 1990
Export Citation:
Assignee:
THOMSON TUBES ELECTRONIQUES
International Classes:
H01J23/06; H01J1/34; H01J5/16; H01J25/04; (IPC1-7): H01J1/34; H01J5/16; H01J23/06
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)
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