用于微波真空电子器件的光电阴极  

Photocathode Used as Microwave Vacuum Electronic Devices

作　　者：刘燕文[1] 田宏[1] 陆玉新[2] 石文奇 朱虹[1] 李芬[1] 李云[1] 谷兵[1] 王小霞[1] LIU Yan-wen;TIAN Hong;LU Yu-xin;SHI Wen-qi;ZHU Hong;LI Fen;LI Yun;GU Bing;WANG Xiao-xia(The Institute of Electronics,Chinese Academy of Science,Beijingl00080,China;Tianjin Trcffic Vocational nstitute,Tianjin 300110,China)

机构地区：[1]中国科学院电子学研究所,北京100190 [2]天津交通职业学院,天津300110

出　　处：《真空》2019年第6期7-11,共5页Vacuum

基　　金：国家自然科学基金项目(批准号：61771454);总装预研基金项目(批准号31512010404-1)

摘　　要：为了满足高频率、小型化真空微波器件的需求,寻找合适的阴极材料和激光系统,开展了用于微波真空电子器件的光阴极研究,提出了一体化的光电阴极制备方法,通过加热具有扩散阻挡层的发射物质存储室,提供受控的光电发射层,以代替活性物质蒸发损失,从而延长阴极的使用寿命,并可以从中毒、暴露大气过程中恢复。在超高真空系统内制备了Cs3Sb光电阴极,利用连续激光器测得其量子效率为0.145%(0.53μm),在能量为0.37W的连续激光照射下,测得发射电流密度达29.2m A/cm2。光电阴极在高强度的激光作用下被损坏后,重新加热激活,光电发射可以得到一定的恢复并长时间稳定,说明这种光电阴极具有可重复激活的特点,有望成为微波真空电子器件的理想电子源。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 Cs3 Sb 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.

关 键 词：微波真空电子器件 光电阴极 激光驱动 量子效率 

分 类 号：TN107[电子电信—物理电子学]