Diffractive laser direct patterning for direct writing of complex holographic security features on hardened steel and hard coatings
Diffractive Images and holographic security features are well suited for individual fraud resistant labeling of genuine parts. Due to their optically striking and high value appeal they can additionally be used as interesting design elements for an up-graded look of certain products. In most cases a direct integration of these structures into the surface of the part is of paramount importance. The application of holographic stickers in form of metalized polymer foils does not guarantee a secure permanent labelling and is not allowable for a variety of high-quality, massive metallic parts found e.g. in the automotive, aerospace or medical industry. Due to the high price for each sticker and the rather poor bonding with the plastic surface, the use of holographic stickers for security labelling of plastic parts is even more problematic. Instead, diffractive design elements or security labels must directly be integrated into the surface of the injection molding tool. Nowadays this can only be done via complex and expensive lithographic techniques (e. g. dry etching).
Therefore a new short pulse laser based direct patterning technology is currently developed within the framework of a joint research project funded by the German Federal Ministry of Education and Research Economics and Technology. The novel technique enables diffractive laser writing of individual, complex, holographic security labels on metals and hard coatings with very high velocities. The technology is particularly suitable for the direct writing of holographic freatures into the surface of injection molding tools enabling the efficient and durable holographic marking of plastic parts.
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Laser-Laboratorium Göttingen e.V. (LLG)
Head of the Department
Dr. Peter Simon
"Short Pulses / Nanostructures"
Contact person for
Nano Structure Technology:
Dr. Jürgen Ihlemann