EFFECT OF COHERENT ELECTROMAGNETIC-RADIATION ON THE ULTRAFAST ELECTRON DYNAMICS OF LASER-EXCITED BULK PHOTOCONDUCTORS

We analyze the role of coherent terahertz radiation on the ultrafast e lectron dynamics of laser excited photoconductors. Generation of elect romagnetic radiation is included within the framework of the usual hot carrier transport theory. A Monte Carlo scheme is used to study the r esulting changes in the nonequilibrium electronic energy and transient drift velocity. Our results reveal a density dependent decrease in bo th quantities, due to reductions in the internal electric fields cause d by radiative energy outflow. At densities above 2 X 10(17) cm-3, we obtain a decrease in the transient velocity and expect delays in the o nset of phonon emission.