A new laser-based method for lateral processing of optical fibers is presented, which can be used for controlled material removal. This method allows the non-hazardous fiber component fabrication without etching and mechanical processing.
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A signal filter and an efficient procedure are presented, which enable the online filtering of interferences with known frequencies with a minor or rather no phase loss and accordingly without signal delay.
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We present a new technology which leads to the development of surface micro structures and a black appearance of Ti containing, commercially available glasses by irradiation with an excimer laser (ArF laser with 193 nm wavelength and 20 ns pulse duration). The technology can be accomplished in a standard air environment and does not require vacuum or inert gas.
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The ADSYNX technology provides a fast and adaptive method for the synchronization of different signals (skew compensation) for any electrical or optical system up to the GHz regime.
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This method provides a fast and efficient way for producing diffractive markings - by ablation of small amounts of material - on glass surfaces. The micro relief, which remains, is producing brilliant spectral colors, when illuminated.
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A novel hub for a free from play transmission of relatively high torsional moments between a shaft and a hub is presented. Moreover, versatile applicable hubs are suggested, by considering manufacturing and supply effort and component variety.
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A novel technology for the mechanical stop of one or multiple rotating propellers is suggested. The emergency propeller stop is achieved by combining a material-mediated engagement mechanism with temporal coordination of rotor contact.
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A technology for the generation of a non-thermal plasma with enhanced pulse energy is presented. Electrodes are tailored with charge collecting elements, which trigger enhanced pulse energies in plasma filaments and a targeted formation of filamented discharges.
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Solutions for an efficient generation of plasma-activated aerosols with high activities are suggested. A cold plasma is ignited directly in the presence of sprayed liquid droplets, leading to intercalation of reactive species on the surface or in the volume of droplets.
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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 compact and cost-effective technology facilitates a real-time, simultaneous measurement of plasma voltage and plasma current with a combined device in the high-voltage circuit of a cold atmospheric plasma. The system exhibits a good time resolution and enables a live plasma self-regulation.
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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 be produced cost-effectively from plastics and metals.
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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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A welding head for laser-assisted or laser-based buildup welding with a coaxial arrangement of the weld deposit feed is presented. 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 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 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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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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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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Unintentional deformation of optical substrates is a common issue in optics technology. The mechanical stress in thin films can have a deleterious effect on the quality of the optical components by deforming the underlying substrate. This patent describes a figure correction method bases on stresses induced by irradiation of glass substrates with an excimer laser.
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This invention is a further development to the flexible hollow fiber for pulse compression which was also developed at the Institut für Nanophotonik Göttingen e.V. (see Ref.: MM-2010-LLG). When laser light is coupled into hollow fibers, the problem often arises that parts of the light distribution can penetrate the thin wall (50-300 μm) and damage it by erosion/ablation/melting. This preconnection element provides a solution approach.
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The present invention suggests a novel device and method for the plasma-based devulcanization of vulcanized rubber, which can be reused as raw material for the fabrication of vulcanizable rubber particles.
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The technology describes a method to fabricate a virtually ideal wave guide for spectral broadening and high damage threshold. This is achieved by embedding a flexible hollow fiber at ideal straightness in a stretched stat in a thermally conductive solid medium, combining high transmission and high robustness even when high laser powers are coupled in. It is an advancement to the flexible hollow fiber developed at the Institut für Nanophotonik Göttingen e.V. (see reference MM-2010-LLG).
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The present invention suggests a novel laser-based system, which allows for a contact-free measurement of deformations/strains. The system can be easily implemented in complex testing setups and yields enhanced performance characteristics.
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A novel device for the generation of negative ion beams by means of alkali metal sputtering is suggested, which exhibits superior performance characteristics. Its design enables a simple and cheap fabrication, while system maintenance is easy.
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These innovative multilayer x-ray targets allow the generation of x-ray radiation based on direct emission of spontaneous x-rays into waveguide modes. Photons are generated by electron impact onto a structured anode target, which is formed as an x-ray waveguide or waveguide array.
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Lithium-ion batteries represent the decisive component with regard to electromobility. Their electrical parameters significantly determine the range and performance of the electric vehicles. The present patented technology enables a process for preparing the anode material before producing the actual battery.
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A microimprint method for on-chip fabrication of Zn-air microbatteries is presented, which bypasses complications of catalyst incorporation on the chip at a target position and paves the way towards production of miniaturized, rechargeable energy sources.
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The invention describes moulding tools, which enable the production of extruded metallic parts with predominantly isotropic properties. In addition, a process is proposed, which favours the production of largely isotropic extruded parts with conventional extrusion presses.
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The present invention enables the loading and reversible storage of hydrogen in a crystalline solid by using a plasma generated by dielectrically impaired discharge. The hydrogen can be removed from the storage material as required, whereby the structure of the storage material is preserved macroscopically.
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The method presented here provides a universal, selective, fast and efficient method for the identification of gaseous molecules based on cavity-enhanced Raman spectroscopy (CERS) at reduced pressure.
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This invention presents a novel nanoscopic device design based on a vertical transistor structure that enables electrolyte-gated organic semiconductors to drive MA cm-2 currents combined with on/off ratios of 108.
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The innovative systems can effectively detach and extract the fine dust particles generated by brake disc and tire abrasion. Overall, the amount of particulate matter released into the environment is significantly reduced.
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A method for the production of a mechanically robust metal foam supported solid oxide fuel cell is presented. The fuel cell allows a quick start up, exhibits increased power densities and can be run at lower temperatures.
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The innovative system can detach the boundary layer near the brake disc (which is loaded with brake dust particles) very efficiently and direct it into the filter mats. Overall, the amount of particulate matter released into the environment is significantly reduced.
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Corrosion and iron clogging are commonly known problems in hydraulic systems. These phenomena are potentially causing great damage to the system or have negative impact on system performance. Scientists at the Leuphana University of Lüneburg developed a novel method to predict iron clogging in water and hydraulic systems.
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The PLASMA-ROLLER allowes to desinfect surfaces and/or activate surfaces for coating. A great variety of materials can be residue-free treated without using chemicals.
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Presented here is a very simple process of manufacturing undercut respectively vaulted surfaces with nano-scaled structures. Especially for cell culture and implantologic purposes those structures are of great interest. Compared to conventional techniques rapid processing of large surface areas is possible.
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The invention relates to a sample holder to be used in cryo fluorescence microscopes or to simply and cost effectively upgrade a room temperature fluorescence microscope. The holder solves existing problems regarding thermal and mechanical stability of the sample and allows for a localization accuracy of a few hundred Angstroms.
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Surface activation or cleaning by cold plasma treatment is getting more and more attention. Current plasma based solutions have mostly fixed electrodes, which are only suited for planar surfaces. Scientists at the HAWK developed a plasma device with flexible electrodes, which allow treatment of irregular surfaces.
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Surface activation or cleaning by cold plasma is getting more and more attention. Current plasma-based solutions for flexible materials however lack efficiency or are technically too complex and error-prone. Scientists at the HAWK developed a plasma roller device for effective and fast plasma treatment of flexible materials.
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The invented method allows to perform high-resolution Image Scanning Microscopy (ISM) purely optically. Very few additional optical components are necessary and the method is suitable for upgrading existing microscopes. The method can also be applied to Two Photon Microscopy.
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Method for X-ray tomography with low-priced, anisotropic laboratory sources with good resolution and high measurement speed.
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Here we present a hand dryer applying simultaneously an atmospheric-pressure plasma which reduces the amount of germs on the hand surface and in the ambient air significantly.
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This invention is an extension for lightsheet microscopy that uses the polarization properties of the analyzed specimen to acquire additional information or to enhance image quality.
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A novel, non-driven and rigid chassis for utility vehicles is presented, which offers a significant weight advantage and suspension properties. The chassis is designed especially for trucks, trailers and busses.
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Presented here is a filter unit that has one or multiple microwave resonators integrated into its filter material, whereby filter load can be monitored during operation. Thus, filter exchange intervals can be adjusted to actual filter capacity.
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When using laser drilling, the material directly behind the drilled hole can be easily damaged. To prevent the damage, materials are placed at the backside of the hole which absorb the laser radiation. Here, a liquid containing nanoparticles is presented as an effective means of protection.
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The LICE-ERASER kills the head-lice and their nits reliably and without any side effects. To use, the LICE-ERASER has to be moved through the hair like a hair-brush. The LICE-ERASER produces a cold plasma generated between the comb tooths, which kills the head-lice and their nits. This procedure is completely free of pain, the user will not feel anything.
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Based on the Kerr effect, the Kerr band switch implements an alternative concept to mode coupling for the generation of ultra-short laser pulses (UKP) in a cost-effective thin film system. The switch is flexible, ultra-fast and loss-free, has a high damage threshold and only low heating.
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Scientists at the HAWK in Göttingen, Germany developed a new plasma device for chemical-free cleaning and sanitizing of textiles or clothes. In addition, odors can also be greatly reduced or eliminated. The device consists of two rollers coated with a flexible dielectric material, which serve as electrodes for plasma treatment.
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Here we present two new methods for flow cytometry and fluorescence-activated cell sorting. Both methods are suitable for the so-called 'sexing' of spermatozoa as well as for many other applications of fluorescence-activated cell sorting and impose less stress on the sorted material than conventional techniques.
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Scientists at the Laser Zentrum Hannover, Germany developed a laser-based method for processing and marking of animals during slaughter. This greatly improves traceability, which on the one hand is demanded by many modern consumers and on the other hand makes it easier to sort out unfit carcasses.
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For reliably stunning animals for slaughter a hybrid captive bolt gun is presented, that has an internal radiation channel through which, after penetration of the animals skull, a high energy laser beam is emitted to induce a coagulation of brain tissue in the Medulla oblongata region, the connection between brain an spinal cord.
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The following invention represents a possibility to identify infusions when administered by an injection pump. The method involves a combination of Raman spectroscopy and refractometry. Both methods of analysis are based on instrumental analysis. Furthermore, algorithms are used for the evaluation which can be assigned to indirect hard modelling and statistics.
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CRISTAL represents a novel biological sample embedding procedure that is based upon UV-curable resin that both fixes the specimen while simultaneously adjusting the refractive index. Additionally, the procedure further allows histological, electron microscopy or molecular biological analyses of embedded samples.
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Scientists at the HAWK in Göttingen, Germany developed a new brush-like plasma device for chemical-free treatment of the scalp to promote hair growth. The small device is easy to handle and can significantly enhance microcirculation as well as oxygen saturation, which are key parameters for stimulating hair growth.
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