用于微波真空电子器件的光电阴极*

doi:10.13385/j.cnki.vacuum.2019.06.02

Abstract

Abstract: To meet the needs of high-frequency, miniaturized vacuum microwave devices, to find suitable cathode materials and laser systems, the photocathode for microwave vacuum electronic devices were studied. The photocathode with diffusion barrier was prepared, by heating the layer of emissive material storage chamber to provides a controlled photoemissive layer for replacing the evaporation loss of the active material, thereby extending the life of the cathode and recovering from poisoning and exposure to the atmosphere. The Cs3Sb photocathode was prepared in an ultra-high vacuum system. The quantum efficiency is about 0.145% at the wavelength of 532 nm, when the photoelectric is illuminated by the continuous laser with an energy of 0.37 W, a current density of 29.2 mA/cm² of the photoemission can be obtained. If the photocathode is damaged by the high-intensity laser, it can be reheated and activated. The photoelectric emission can be restored to a certain degree and stabilized for a long time. This photocathode has the characteristics of reproducible activation and is expected to be ideal electronic source for microwave vacuum electronic devices.

Key words: microwave vacuum electronic devices, photocathode, driven by laser, emission properties

CLC Number:

TN107

LIU Yan-wen, TIAN Hong, LU Yu-xin, SHI Wen-qi, ZHU Hong, LI Fen, LI Yun, GU Bing, WANG Xiao-xia. Photocathode Used as Microwave Vacuum Electronic Devices[J].VACUUM, 2019, 56(6): 7-11.

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Photocathode Used as Microwave Vacuum Electronic Devices

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