Pulsed THz radiation under ultrafast optical discharge of vacuum photodiode  

作　　者：Aleksandr Ushakov Kseniia Mamaeva Leonid Seleznev Georgy Rizaev Vladimir Bukin Timophey Dolmatov Pavel Chizhov Vladimir Bagdasarov Sergey Garnov 

机构地区：[1]Prokhorov General Physics Institute of the Russian Academy of Sciences,Moscow 119991,Russia [2]Physical Institute,Russian Academy of Sciences,Moscow 119991,Russia [3]Moscow Institute of Physics and Technology,Dolgoprudny 141700,Russia [4]Russian Institute for Scientific and Technical Information,Moscow 125190,Russia

出　　处：《Frontiers of Optoelectronics》2024年第2期99-112,共14页光电子前沿（英文版）

基　　金：supported by Ministry of Science and Higher Education of the Russian Federation(Project No.075-15-2020-790).

摘　　要：In this paper,we first present an experimental demonstration of terahertz radiation pulse generation with energy up to 5 pJ under the electron emission during ultrafast optical discharge of a vacuum photodiode.We use a femtosecond optical excitation of metallic copper photocathode for the generation of ultrashort electron bunch and up to 45 kV/cm external electric field for the photo-emitted electron acceleration.Measurements of terahertz pulses energy as a function of emitted charge density,incidence angle of optical radiation and applied electric field have been provided.Spectral and polarization characteristics of generated terahertz pulses have also been studied.The proposed semi-analytical model and simulations in COMSOL Multiphysics prove the experimental data and allow for the optimization of experimental conditions aimed at flexible control of radiation parameters.

关 键 词：Electron emission Vacuum photodiode Ultrafast excitation TERAHERTZ 

分 类 号：TN151.1[电子电信—物理电子学]