Ein hocheffizientes Verfahren zur Entfernung von Restsauerstoff aus Edelgasen wird vorgeschlagen, das den Einsatz hochreaktiver Substanzen umgeht und die Verunreinigung von Edelgasen vermeidet.
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A highly efficient process for the removal of residual oxygen from nobel gases is suggested, which bypasses the use of highly reactive substances and avoids contamination of nobel gases.
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This technology describes the continuous buildup welding of thin rod-shaped materials (especially thin wires) onto a substrate using laterally coupled laser radiation. The wire is positioned in relation to the substrate material in such a way that both meet at an sharp angle. In this contact area, both materials are illuminated with a pre-shaped, focused and pulsed laser beam melting the thin wires only partially.
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Researchers at the Institute of Nanophotonics Göttingen e.V. have developed a microstructuring process for commercial titanium-containing glasses by excimer laser irradiation. By irradiating commercial TiO2-containing glasses in ambient air with an excimer laser (ArF laser with 193nm wavelength and 20ns pulse duration), microstructures can be generated and thus the surface darkened.
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This technology allows to measure plasma voltage and plasma current simultaneously and with a combined device in the high-voltage circuit of a cold atmospheric plasma. From this, the discharge power of the plasma can subsequently be calculated. The new measuring device is compact and a cost-effective alternative to the measuring technology normally required.
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The invention describes a novel high-voltage direct-current (HVDC) transmission clutch unit and a method for coupling at least two AC voltage power supply networks with each other.
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A manufacturing process for steel components with a predominantly bainitic structure is proposed, which avoids the conventionally required long production times and enables large-scale production.
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The invention describes multifunctional, self-locking connection hook elements, which combine features of a rigging plate and a hook in one component. The components can, for example, be produced cost-effectively from thermoplastics.
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A novel production method for a biobased adhesive, which comprises a tailored lignin structure as main component, is presented. The process technology overcomes the use of toxic phenol and formaldehyde, while the resulting adhesive exhibits good physicochemical and mechanical properties.
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This novel device enables the cleaning of water in a pipe system into which an irradiation unit is inserted via an insertion module with flange connection. The surrounding water is then irradiated across the entire cross-section with a blue laser as it passes through the quartz tube, killing any microorganisms it contains.
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Scientists at the Laser Zentrum Hannover have developed a welding head for laser-assisted or laser-based buildup welding with a coaxial arrangement of the weld deposit feed. Several individual beams are bundled in a focal point below the welding material supply. In general, all meltable materials (e.g. metals, glass or polymers) can be processed with this system.
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A force- and vibration-free joining process for metal and thin glass was developed at the Laser Zentrum Hannover e.V.. In this process, the thin glass is pressed onto the metal substrate with as little contact as possible and the two joining partners are heated by means of laser radiation, resulting locally in a partly seamless, partly form-fit connection.
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A stretched flexible hollow fiber is proposed as a waveguide in high-energy pulse compressors. This approach leads to superior straightness virtually independent of the fiber length. It is particularly well suited for fibers with inner diameters much larger than the wavelength, where the main limitation for the fiber length is losses due to undesired fiber bending.
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Nonlinear crystals are used for frequency conversion of lasers. With the help of this technology the radiation hardness in the UV range could be increased and at the same time the laser construction could be simplified, because the crystals do not have to be heated permanently. In particular, the present patent concerns the nonlinear family of hygroscopic borates (LBO, BBO, CLBO), which are particularly suitable for the generation of photons in the ultraviolet (UV) spectral range.
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A method has been found for freeform shaping of optical surfaces via a stress-induced viscous deformation of glass plates. Fused silica substrates can be deformed by covering them with substoichiometric silicon oxide followed by a laser patterning process and an annealing step.
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The newly developed method provides a fast and efficient way for producing gratings - by ablation of small amounts of material - on glass surfaces. Consequently, the economic labeling of glass with patterns causing diffraction becomes possible. These patterns shine in different colors if observed from different angles.
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The newly developed method allows for shifting of the interference plane in the Z-direction during diffractive marking of surfaces with a grating interferometer. Plane-parallel plates are used, the rotation of which introduces a beam offset that causes a Z-shift of the interference plane when the beams are combined.
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The newly developed method only requires the detection of movement directions of light patterns (speckles) for the determination of refractive error of the human eye. The subjective evaluation of the effect of the corrective lenses by the patient can thus be reduced to a simple question (e.g. right/left).
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A special interference process allows the fabrication of computer-generated holography (CGH) as carrier of information which can’t be recognized with the human eye. The CGHs consist of N * M pixels which, when illuminated with coherent light, generate an imagine with the same pixel dimensions in a Fourier plane. Several CGHs can be written on the same area. When illuminated with the same coherent reading beam, they appear separately in different directions (diffraction orders).
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This innovative approach combines the two known methods of Laser Induced Backside Wet Etching (LIBWE) and Stimulated Emission Depletion (STED) to realize laser based material modifications below the diffraction limit. This is especially useful for precision laser modifications of transparent materials.
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