METHOD AND DEVICE FOR STRUCTURING A SOLID BODY SURFACE WITH A HARD COATING WITH A FIRST LASER WITH PULSES IN THE NANOSECOND FIELD AND A SECOND LASER WITH PULSES IN THE PICO- OR FEMTOSECOND FIELD ; PACKAGING FOIL

摘要

In the method for structuring at least one area of a solid body surface provided with a ta-C coating, by means of a first laser, preferably an excimer laser having pulse durations in the nanosecond range, a first structure is produced upon which a second, ripple-like structure is superposed by means of a second laser, preferably having pulse durations in the femtosecond range. Preferentially, the excimer laser structuring is carried out according to the mask projection technique and the femtosecond laser structuring according to the focus technique. This method allows the rational manufacture of very complex, extremely fraud-resistant authentication features and/or of esthetically attractive, optical diffraction effective colored patterns.