Verfahren zum Herstellen von Bohrungen mit großem Aspektverhältnis in metallischen Werkstoffen sowie in geschichteten metallischen Werkstoffen und solchen, die mindestens eine keramische Schicht aufweisen

The invention relates to a method for producing boreholes with a large aspect ratio, in metallic materials, layered metallic materials and materials comprising at least one ceramic layer, by means of laser radiation, the intensity of the laser beam being adjusted according to the required modification of the borehole radius in relation to the borehole depth. The spatial distribution of the intensity of the laser beam, in relation to the changing bottom of the borehole, is adjusted in such a way that the intensity I inside the segment w0 at a distance w from the laser beam axis falls off monotonously by the value DeltaI, and values are set for the spatial modification DeltaI of the intensity I and for the segment w0 that are high enough that the borehole radius rB is larger than the segment w0, which is the radius of the laser beam (rB>w0).