When the outer electron of an alkali atom in an electric field is laser excited just above the field-induced ionization threshold, the electron ejection will not be instantaneous. Calculations show there are a number of energy regions where, upon short-pulse laser excitation, the atom will eject a train of electron probability pulses with the pulses being nearly equally spaced in time. This system can be the source of a picosecond pulsed electron gun. We show that it is possible to coherently control the electron pulse frequency while the pulse train is being emitted.

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Persistent URL dx.doi.org/10.1364/JOSAB.15.000001
Journal J. Opt. Soc. Am. B
Robicheaux, F, Lankhuijzen, G. M, & Noordam, L. D. (1998). A scheme for a coherently controlled pulsed electron gun. J. Opt. Soc. Am. B, 15(1), 1–5. doi:10.1364/JOSAB.15.000001