Dr. Martin Teich Profile

Dr. Martin Teich

Research and Development at TU Dresden

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Publications (3)

Proceedings Article | 12 March 2024 Paper

Novel reflective SLM in real holographic 3D HUD displays and their impact on quality

Norbert Leister, Tim Wagner, Tobias Schuster, Martin Teich, Steffen Zozgornik, Hagen Stolle, Sara Francés González, Peter Duerr

Proceedings Volume 12913, 1291303 (2024) https://doi.org/10.1117/12.3001348

KEYWORDS: Heads up displays, Holography, Holograms, Mirrors, Spatial light modulators, Simulations, Crosstalk

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Proceedings Article | 26 June 2017 Paper

Distortion-free 3D imaging using wavefront shaping

M. Teich, J. Sturm, L. Büttner, J. Czarske

Proceedings Volume 10335, 1033514 (2017) https://doi.org/10.1117/12.2269928

KEYWORDS: Cameras, Stereoscopic cameras, 3D image processing, Point spread functions, Optical signal processing, Microfluidics, Associative arrays, 3D metrology, Aberration correction, Illumination engineering, Wavefronts, Microfluidic imaging, Pollution control, Video, Light sources, Deformable mirrors

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Proceedings Article | 13 June 2017 Paper

Application of adaptive optics for flexible laser induced ultrasound field generation and uncertainty reduction in measurements

Lars Büttner, Felix Schmieder, Martin Teich, Nektarios Koukourakis, Jürgen Czarske

Proceedings Volume 10449, 104490R (2017) https://doi.org/10.1117/12.2269963

KEYWORDS: Adaptive optics, Optical testing, Wavefronts, Wavefront distortions, Laser metrology, Inspection, Refractive index, Velocity measurements

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The availability of spatial light modulators as standard turnkey components and their ongoing development makes them attractive for a huge variety of optical measurement systems in industry and research. Here, we outline two examples of how optical measurements can benefit from spatial light modulators. Ultrasound testing has become an indispensable tool for industrial inspection. Contact-free measurements can be achieved by laser-induced ultrasound. One disadvantage is that due to the highly divergent sound field of the generated shear waves for a point-wise thermoelastic excitation, only a poor spatial selectivity can be achieved. This problem can be solved by creating an ultrasound focus by means of a ring-like laser intensity distribution, but standard fixed-form optical components used for their generation are always optimised to a fixed set of parameters. Here, we demonstrate, how a predefined intensity pattern as e.g. a ring can be created from an arbitrary input laser beam using a phase-retrieval algorithm to shape an ultrasound focus in the sample. By displaying different patterns on the spatial light modulator, the focus can be traversed in all three directions through the object allowing a fast and highly spatially resolving scanning of the sample. Optical measurements take often place under difficult conditions. They are affected by variations of the refractive index, caused e.g. by phase boundaries between two media of different optical density. This will result in an increased measurement uncertainty or, in the worst case, will cause the measurement to fail. To overcome these limitations, we propose the application of adaptive optics. Optical flow velocity measurements based on image correlation in water that are performed through optical distortions are discussed. We demonstrate how the measurement error induced by refractive index variations can be reduced if a spatial light modulator is used in the measurement setup to compensate for the wavefront distortions.

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