To protect the material at the backside of a workpiece during laser drilling or cutting, an absorbing material is used. Here a nanoparticle-suspension provides a particularly efficient protection wLaser drilling without backing material damages the workpiece. A nanoparticle-suspension helps to prevent the damage. (Source: Patent application DE102013212665B4)ith further advantages like cooling. During laser drilling, material situated behind the bore can be easily damaged by laser radiation. A common problem, for example, during the manufacturing of injection nozzles. To prevent the damage, a material which absorbs the majority of the laser radiation is placed at the working side. The material can be a solid which typically absorbs almost all of the radiation but has the disadvantage that it cannot be used if the geometry of the workpiece makes it impossible to place a solid material behind the bore. Figure (Laser drilling without backing material damages the workpiece. A nanoparticle-suspension helps to prevent the damage. (Source: Patent application DE102013212665B4))



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