Systems, including method and apparatus, for processing workpieces driven automatically along a linear path to a plurality of positions disposed substantially along the linear path. The sole includes a midsole having at least one protrusion disposed in a forefoot region thereof and a plate having at least one receptacle disposed therein wherein the plate is fixedly attached to the midsole such that the receptacle aligns with the protrusion. The ceramic output coupler may be a ceramic substrate with a dimpled light emitting surface which reduces Fresnel and critical angle optical losses.