High current ultrafast laser induced electron emission from a DC-biased metallic surface

In this paper, we will present a non-equilibrium model to describe the ultrafast laser induced electron photo-field emission from a dc biased metallic surface1. Using a microscopic kinetic approach, we determine the nonequilibrium electron distribution after the laser excitation, and calculate the time-dependence of the emitted electron charges and current density. It is found that the classical two temperature model valid of ps time scale is no longer valid when the pulse duration is less than 100 femtosecond. The transition to space charge limited condition will be studied.