Physics & Technology & Software

Laser-based water cleaning

This novel device enables the cleaning of water in 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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Laser processing head for direction-independent build-up welding

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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Laser process for bonding glass to metal

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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Flexible hollow fiber for pulse compressors

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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Water-free hygroscopic laser crystals

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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Freeform shaping of fused silica substrates

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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Gratings on glass surfaces

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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Speckle board

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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Z-shifter for diffractive labeling of curved surfaces

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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Superimposed CGHs on metals using laser ablation of diffractive pixels

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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STED principle for laser back ablation

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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Figure correction of glass substrates

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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Preconnection element for the protection of hollow fibers

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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Device and process for the devulcanization of vulcanized rubber products

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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Embedded flexible hollow fiber

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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Contactless optical extensometer

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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Efficient source of negative ions

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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X-ray targets for generating x-ray radiation from a waveguide

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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Carbon PreForm - pre-prepared anode material

Lithium-ion batteries represent the decisive component with regard to electromobility. Their electrical parameters significantly determine the range and performance of the electric vehicles. Scientists at Ostfalia University of Applied Sciences developed a process for preparing anode material before producing the actual battery. The idea is to put the time- and energy-intensive process of initial charging in front and thus make battery series production less dangerous, faster and more scalable.

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On-chip solid-state Zn-air microbattery and method for its manufacture

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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Mould and process for the extrusion of metallic materials

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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Method and device for loading hydrogen-storing solids

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 by heating as required, whereby the structure of the storage material is preserved macroscopically.

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Cavity-enhanced Raman spectroscopy at reduced pressure

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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Vertical Electrolyte-gated Organic Transistors

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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Brake dust collector with venturi suction generator for active boundary layer manipulation

For efficient collection of brake or tire dust, this present brake dust collector uses an air feed to shed the dust containing boundary layer off the surface. The suction needed, is provided by a venturi nozzle at the inner surface of the vehicle wheel.

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Method for the production of a metal foam supported solid oxide fuel cell

Within the scope of the energy revolution, fuel cells play a key role for future energy systems. The present invention describes a method for the production of a robust, quick starting, metal foam supported solid oxide fuel cell, which can be run at lower temperatures and exhibits increased power densities.

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Brake dust filter hood with final separator and vortex generator for passive manipulation of the boundary layer

For passive collection of brake dust, the present brake dust collector uses a final separator to remove the dust containing boundary layer from the surface and guide it into filter mats. The removal of the dust becomes even more efficient by integration of a vortex generator inside the hood.

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Novel technology to predict iron clogging and corrosion in water and hydraulic systems

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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PLASMA-ROLLER for conditioning of surfaces

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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Hybrid Plasma-Laser Micro-Structuring

Unique nano-seals allow for forgery-proof object identification. Due to a combination of ion irradiation and simultaneous co-deposition of metal atoms a unique surface pattern is created. Its manufacturing process and size of a few square micrometers make it impossible to be reproduced, thus creating a forgery-proof identifier.

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Efficient manufacturing of undercut or vaulted nano-scaled surfaces

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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Ultra-stable cryostage for cryo fluorescence microscopy applications

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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Flexible plasma electrode design for effective treatment of irregular surfaces

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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Plasma device for tapes and other flexible materials

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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Plasma cushion for treating objects

Device and method of treating objects & bulk materials with a physical plasma cushion at atmospheric pressure. The plasma passes from the discharge chamber to the treatment chamber through a sparger plate comprising a multitude of holes, producing a plasma cushion, which supports & slides/pushes the objects while treating them.

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Optical Image Scanning Microscope

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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X-Ray tomography with anisotropic sources

Method for X-ray tomography with low-priced, anisotropic laboratory sources with good resolution and high measurement speed.

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Plasma hand dryer

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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Polarization Lightsheet Microscopy

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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Utility vehicle lightweight chassis with build-in wheel alignment mechanism

Presented here is a rigid, non-driven lightweight chassis for utility vehicles that offers a significant weight advantage and includes a build-in mechanism for cost-effective wheel alignment.

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Filter-unit-with-microwave-resonator

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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Absorbing nanoparticle-suspension for laser drilling

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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LICE ERASER — reliably killing of head-lice and their nits

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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Kerr-Band-Switch

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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New plasma device for chemical-free cleaning and sanitizing of textiles

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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Improved method for alignment and sorting of cells in flow cytometry

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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Slaughter-integrated laser marking of farm-animals

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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Laser Captive Bolt Gun

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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Raman Refractometer Analyser Tool

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 - sample embedding for correlative microscopy

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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New plasma device to treat hair loss

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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