Method and device for producing riblets

Method for producing riblets wherein the riblets are applied by means of laser interference patterning, in particular into a painted and cured surface.

Method according to 26, characterized in that the optical deflection body for deflecting a partial beam comprises a three-dimensionally curved deflection area for focusing the partial beam onto the surface and/or for specifically modifying of the combination angle θ dependent on a tilt angle change δ of the tiltable deflection mirror, in particular with a processing distance which is independent from a tilt angle change δ.

Device for applying riblets by means of laser interference patterning in particular into a painted and cured surface of a component, comprising a laser, a processing head with a beam splitting device and a focusing device as well as movement unit, wherein the movement unit is configured such that the processing head can be moved over a surface to be processed, wherein the processing head is configured such that by aid of two interfering partial beams on the in particular painted and cured surface an interference structure with intensity maxima Imax in a periodic distance L can be generated, wherein the device is configured such that during the riblet production, in particular during the application of the riblets into the surface, a combination angle θ between the two interfering partial beams can be specifically modified.