Rear Au-contacts of GaP:N-LEDs are selfaligned structured as to the front contacts by a single ruby laser pulse irradiation-induced ablation process. The front contacts acting as masks are not damaged by the intensive laser light which must pass the front surface in order to reach the rear Gap/Au-interface. The areas of the Gap-surface where the Au-contact layer is removed exhibit a very irregular shape, caused by excess evaporation of Gap due to focusing reflections of the laser light at the GaP/Au- contact interface, and therefore reduced optical cross-talk. Some of the features of the ablation process are explained by a simple theoretical model