Author/Authors :
Geissler، نويسنده , , K. and Meineke، نويسنده , , A. and Riege، نويسنده , , H. and de Silvestri، نويسنده , , S. and Nisoli، نويسنده , , M. and Svelto، نويسنده , , O. and Boscolo، نويسنده , , I. and Handerek، نويسنده , , J.، نويسنده ,
Abstract :
The efficiency of laser-induced electron emission from ferroelectric (FE) cathodes has been measured by illumination with a Ti:sapphire laser at a pulse length of 140 fs and is compared to earlier measurements at 40 ps and 5 ns pulse lengths. Two modes of emission are observed: (i) a “normal steady-state” emission in the presence of a constant extraction field and (ii) a transient mode after a polarization switching of the FE cathode by a high-voltage pulse. The latter mode leads to “self-emission” of high electron currents with kinetic electron energies of several kilovolts. The physical interpretation and the potential applications of laser-induced electron emission from FE cathodes are briefly pointed out.
