Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Technische Universitaet Dresden

Andres Fabian Lasagni

Tim Kunze

Teja Roch

Bogdan Voisiat

Sabri Alamri

Florian Roessler

Mikhael El-Khoury

Dimitri Benke

An optical arrangement for direct laser interference structuring. A laser beam is directed to a reflecting mirror with inclined surface and strikes a first beam splitter, it is divided into two partial beams and one partial beam is deflected to a focusing element. The second partial laser beam is directed to a first pentamirror and after multiple reflection and/or refraction, the focusing element, or it is directed to a second beam splitter and is divided into a first partial beam and a third partial beam. The partial beams are directed to the focusing element by the first pentamirror and are directed by the focusing element to the surface to be structured interfering with each other. The reflecting mirror is moved in a translational manner, maintaining a 45&#xb0; angle parallel to the optical axes of the emitted laser beam influencing the interference period &#x39b;.

Optical arrangement for direct laser interference structuring

The present invention relates to a labeling element for items, which on a surface thereof is formed with a plurality of pixels with periodic lattice structures, in particular linear lattice structures. Lattice structures with in each case one structural period &#x39b; and an alignment of the structural elements, which are aligned to one another in particular in a linear parallel manner, at an angle &#x3c6; with respect to an axis of reference are formed in individual pixels such that when the pixels constituting the labeling element are irradiated with electromagnetic radiation, preferably monochromatic electromagnetic radiation, an image of the labeling element is created on an detector array or a surface, by means of images of at least one order of diffraction of the electromagnetic radiation diffracted by pixels which can be used for identification of the respective labeling element.

Labeling element for items

The invention relates to a method for forming a structuring at surfaces of components using a laser beam. In the invention, a laser beam is directed onto a diffractive optical element. The diffractive optical element is configured such that the laser beam is split into at least two part beams and the part beams are directed at an angle &#x3b1; with respect to the optical axis of the laser beam onto at least one further optical element which is transparent for the laser radiation. The further optical element(s) has/have a first surface and a second surface which is inclined at an angle to the optical axis of the laser beam at which the beam direction of the part beams is changed by optical refraction. A focusing optical lens is arranged in the optical path of the part beams between the further optical element(s) and a component surface to be processed, and the part beams are focused such that they are incident onto the surface of the component at a common position at an angle of incidence &#x3b2; with respect to the optical axis of the laser beam. The distance dbetween the optical elements is changed to change the interference period.

Method and arrangement for forming a structuring on surfaces of components by means of a laser beam

Apparatus for interference patterning of a planar sample including a laser and a focusing arrangement positioned in a beam path of the laser so that the laser beam is imaged in a first spatial direction in a focused manner into a sample volume in which the planar sample is positioned. An expanding and splitting arrangement is positioned downstream of the focusing arrangement for the laser beam, while maintaining the focused imaging in a first spatial direction which can be expanded in a second spatial direction, and which can be split into two partial beams. These two partial beams can be directed onto the sample volume.

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Grumbach, Germany

Andres Fabian Lasagni