For this purpose, several kinds of laser-driven photocathodes, and some thermionic cathodes and field emission cathodes are applied.
为此，人们采用各种类型的激光驱动光电阴极、一些热阴极和场致发射阴极作为电子源。
The electron source may emit electrons either via field emission or thermionic emission.
该电子源可经由场发射或热离子发射来发射电子。
The electron source may emit electrons either via field emission or thermionic emission.
该电子源可经由场发射或热离子发射来发射电子。
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