新型光电阴极的研究进展*

doi:10.13385/j.cnki.vacuum.2024.05.09

Abstract

Abstract: To meet the needs of high-frequency, miniaturized vacuum microwave devices, and find suitable cathode materials and laser systems, a strategy to develop new type of Cs3Sb cathode was studied. A tungsten sponge diffusion barrier layer was used as the evaporation source of the emission material, instead of the traditional nickel tube heating method. In order to enhance the adsorption capacity and light absorption rate of the cathode, the surface of the cathode substrate was modified by nanoparticle thin film coating and ion beam surface modification. The photoemission characteristics of the photocathodes before and after surface modification of the photocathode were studied. The results show that the photoemission quantum efficiency increases greatly after modification. It is believed through analysis that the main cause for the increase in quantum efficiency is the enhancement of light absorptivity and the increase in emission surface area.

Key words: photocathode, driven by laser, porous tungsten, nanoparticle film, ion beam surface modification, quantum yield

CLC Number: TN105.1

LIU Yan-wen, SHANG Xin-wen, LU Yu-xin, TIAN Hong, ZHAO Heng-bang. The Development of a Novel Photocathode[J].VACUUM, 2024, 61(5): 64-73.

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The Development of a Novel Photocathode

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