DEVICE AND METHOD FOR STRUCTURING A ROLLER BY MEANS OF LASER REMOVAL

摘要

The invention relates to a device (20) for structuring a roller (22) by means of laser removal, comprising a roller-holding apparatus, which is designed to hold a roller (22) to be structured, a laser source (24), which is designed to produce a series of laser pulses, and an optical system (26), which is designed to direct laser pulses produced by the laser source (24) toward the surface of a roller (22) held in the roller-holding apparatus, wherein the optical system (26) comprises an optical element (28), which is designed to modify the spatial intensity pattern of a laser pulse and to enlarge the processing field (42, 44, 48, 50) irradiated by the laser pulse on the surface of the roller (22). The invention further relates to a method for structuring a roller (22) by means of laser removal, in which laser pulses are directed by means of an optical system (26) toward the surface of a roller (22) to be structured such that the roller (22) is structured by laser removal in processing fields (42, 44, 48, 50) irradiated by the laser pulses, wherein by means of an optical element (28), in particular a diffractive optical element or a spatial modulator for light, the spatial intensity pattern of a laser pulse is modified and the processing field (42, 44, 48, 50) irradiated by the laser pulse on the surface of the roller (22) is enlarged in dependence on the maximum mean power Pm and/or adapted in such a way that the optimal removal fluence Φο results.