Laser physics and optics

Laser-based water cleaning

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-indep. build-up welding

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

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

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

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

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

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

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 - diffractive labeling of curved surfaces

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 using laser ablation of diffractive pixels

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

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

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

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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Embedded flexible hollow fiber

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

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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X-ray target for generating x-ray radiation from waveguides

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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Undercut and vaulted nano-scaled surfaces

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

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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Optical Image Scanning Microscope

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

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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