A MODEL OF THE METALLIC SURFACE-EMITTING 2ND-HARMONIC GENERATOR

We present an accurate calculation of the intensity of the second harm onic radiation generated by the reflection of the incident radiation f rom a metal surface, This radiation is due to two currents, The first current results from the rapid variation of the normal component of th e oscillating electric field in the vicinity of the surface and depend s on both conduction and bound electrons, The second one results from the action of the Lorentz force on conduction electrons, We show that if the adiabatic and the Thomas-Fermi assumptions are considered, then an accurate calculation of these currents is possible and leads to a simple relation of the intensity of the second harmonic radiation.