Laser physics and optics

Micro-structured black titania surfaces

Micro-structured black titania surfaces

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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Diffractive marking of glass

Diffractive marking of glass

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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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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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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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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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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Polarization Lightsheet Microscopy

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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CRISTAL – sample embedding for correlative microscopy

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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