Dr. Andreas Hermerschmidt Profile

Dr. Andreas Hermerschmidt

Head of Diffractive Optics Group at HOLOEYE Photonics AG

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 7 August 2023 Paper

Single-shot structured light with diffractive optic elements for real-time 3D imaging in collaborative logistic scenarios

Darko Vehar, Andreas Hermerschmidt, Rico Nestler, Karl-Heinz Franke

Proceedings Volume 12624, 126240V (2023) https://doi.org/10.1117/12.2675818

KEYWORDS: Projection systems, Cameras, Structured light, Diffractive optical elements, Calibration, Content addressable memory, 3D image processing, Imaging systems, 3D metrology, Binary data

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We introduce an innovative concept for 3D imaging that utilizes a structured light principle. While our design is specifically tailored for collaborative scenarios involving mobile transport robots, it is also applicable to similar contexts. Our system pairs a standard camera with a projector that employs a diffractive optical element (DOE) and a collimated laser beam to generate a coded light pattern. This allows a three-dimensional measurement of objects from a single camera shot. The main objective of the 3D-sensor is to facilitate the development of automatic, dynamic and adaptive logistics processes capable of managing diverse and unpredictable events. The key novelty of our proposed system for triangulation-based 3D reconstruction is the unique coding of the light pattern, ensuring robust and efficient 3D data generation, even within challenging environments such as industrial settings. Our pattern relies on a perfect submap, a matrix featuring pseudorandomly distributed dots, where each submatrix of a fixed size is distinct from the others. Based on the size of the working space and known geometrical parameters of the optical components, we establish vital design constraints like minimum pattern size, uniqueness window size, and minimum Hamming distance for the design of an optimal pattern. We empirically examine the impact of these pattern constraints on the quality of the 3D data and compare our proposed encoding with some single-shot patterns found in existing literature. Additionally, we provide detailed explanations on how we addressed several challenges during the fabrication of the DOE, which are crucial in determining the usability of the application. These challenges include reducing the 0th diffraction order, accommodating a large horizontal field of view, achieving high point density, and managing a large number of points. Lastly, we propose a real-time processing pipeline that transforms an image of the captured dot pattern into a high-resolution 3D point cloud using a computationally efficient pattern decoding methodology.

Proceedings Article | 5 March 2021 Poster + Presentation + Paper

Non-paraxial diffractive optical elements for beam-splitting with ultra-high uniformity

Pavel Dyachenko, Andre Wiss, Andreas Hermerschmidt

Proceedings Volume 11672, 1167212 (2021) https://doi.org/10.1117/12.2576889

KEYWORDS: Diffractive optical elements, Diffraction, Three dimensional sensing, Optical components, Microscopy, Materials processing, Laser applications, Fourier transforms, Binary data

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Proceedings Article | 21 February 2020 Paper

Adjoint method and inverse design for diffractive beam splitters

Dong Cheon Kim, Andreas Hermerschmidt, Pavel Dyachenko, Toralf Scharf

Proceedings Volume 11261, 1126115 (2020) https://doi.org/10.1117/12.2543367

KEYWORDS: Beam splitters, Diffraction, Diffraction gratings, Optical design, Optimization (mathematics), Binary data, Dielectrics, Diffractive optical elements, Optical components, Optical simulations

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Proceedings Article | 4 March 2019 Presentation + Paper

Design and analysis of binary fan-out gratings based on step-transition perturbation approach

Dong Cheon Kim, Andreas Hermerschmidt, Pavel Dyachenko, Toralf Scharf

Proceedings Volume 10904, 109041L (2019) https://doi.org/10.1117/12.2507925

KEYWORDS: Diffraction, Diffraction gratings, Binary data, Optimization (mathematics), Optical design, Diffractive optical elements, Polarization, Beam splitters, Optical components, Device simulation

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Proceedings Article | 27 February 2019 Paper

Diffractive optical elements investigation in the phase domain

Michail Symeonidis, Dong Cheon Kim, Andreas Hermerschmidt, Myun-Sik Kim, Toralf Scharf

Proceedings Volume 10914, 109141W (2019) https://doi.org/10.1117/12.2509668

KEYWORDS: Phase measurement, Spiral phase plates, Diffraction, Diffractive optical elements, Silica, Objectives, Metrology, Microscopes, Photonics, Spectral resolution

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Proceedings Article | 26 June 2017 Paper

Design and quality metrics of point patterns for coded structured light illumination with diffractive optical elements in optical 3D sensors

Ralf Vandenhouten, Andreas Hermerschmidt, Richard Fiebelkorn

Proceedings Volume 10335, 1033518 (2017) https://doi.org/10.1117/12.2270248

KEYWORDS: Sensors, Diffractive optical elements, Binary data, Stereoscopic cameras, Cameras, Projection systems, Collimation, Semiconductor lasers, Optical signal processing, Optical design, Structured light, Signal to noise ratio, Light sources

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Proceedings Article | 27 April 2016 Paper

Precision glass molding of high-resolution diffractive optical elements

Karin Prater, Julia Dukwen, Toralf Scharf, Hans Herzig, Sven Plöger, Andreas Hermerschmidt

Proceedings Volume 9888, 98880U (2016) https://doi.org/10.1117/12.2228873

KEYWORDS: Glasses, Carbon, Precision glass molding, Diffractive optical elements, Photomasks, Lithography, Micro optics, Fabrication, Electron beam lithography, Reactive ion etching, Optical resolution, Integrated optics, Etching, Silicon, Beam splitters, Scanning electron microscopy, Diffraction, Silica

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Proceedings Article | 24 September 2015 Paper

Multilevel micro-structuring of glassy carbon molds for precision glass molding

Karin Prater, Julia Dukwen, Toralf Scharf, Hans Peter Herzig, Sven Plöger, Andreas Hermerschmidt

Proceedings Volume 9628, 96281M (2015) https://doi.org/10.1117/12.2191661

KEYWORDS: Glasses, Etching, Precision glass molding, Beam splitters, Diffractive optical elements, Silicon, Carbon, Optical fabrication, Reactive ion etching, Semiconducting wafers

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Proceedings Article | 13 March 2015 Paper

Multilevel micro-structuring of glassy carbon for precision glass molding of diffractive optical elements

Karin Prater, Julia Dukwen, Toralf Scharf, Hans Peter Herzig, Sven Plöger, Andreas Hermerschmidt

Proceedings Volume 9374, 937410 (2015) https://doi.org/10.1117/12.2080762

KEYWORDS: Glasses, Etching, Diffractive optical elements, Precision glass molding, Titanium, Silica, Carbon, Photomasks, Power meters, Reactive ion etching

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Proceedings Article | 25 September 2014 Paper

Surface micro-structuring of glassy carbon for precision glass molding of diffractive optical elements

Karin Prater, Julia Dukwen, Toralf Scharf, Hans Peter Herzig, Andreas Hermerschmidt

Proceedings Volume 9192, 919211 (2014) https://doi.org/10.1117/12.2062904

KEYWORDS: Glasses, Etching, Titanium, Carbon, Diffractive optical elements, Reactive ion etching, Glass molding, Photomasks, Silica, Precision glass molding

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Proceedings Article | 7 March 2014 Paper

Wafer-level microstructuring of glassy carbon

Loïc Hans, Karin Prater, Cédric Kilchoer, Toralf Scharf, Hans Peter Herzig, Andreas Hermerschmidt

Proceedings Volume 8974, 89740Y (2014) https://doi.org/10.1117/12.2038396

KEYWORDS: Etching, Carbon, Titanium, Aluminum, Reactive ion etching, Photomasks, Photoresist materials, Semiconducting wafers, Glasses, Optical lithography

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Proceedings Article | 18 May 2012 Paper

Snapshot spectral imaging using optimized diffractive optical elements

Martin De Biasio, Thomas Arnold, Andreas Tortschanoff, Andreas Hermerschmidt, Raimund Leitner

Proceedings Volume 8374, 837413 (2012) https://doi.org/10.1117/12.919052

KEYWORDS: Diffractive optical elements, Glasses, Imaging systems, Optical design, Imaging spectroscopy, Charge-coupled devices, Spectroscopy, Data acquisition, CCD cameras, Diffraction

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Proceedings Article | 3 February 2012 Paper

Optimisation of the diffractive optical element for snapshot spectral imaging used in fluorescence microscopy

R. Leitner, T. Arnold, M. De Biasio, G. McGunnigle, R. Rogojanu, G. Steiner, A. Hermerschmidt

Proceedings Volume 8227, 82270E (2012) https://doi.org/10.1117/12.909199

KEYWORDS: Diffractive optical elements, Imaging systems, Calibration, Cameras, Luminescence, Imaging spectroscopy, Microscopy, Spectroscopy, Reconstruction algorithms, Spectral resolution

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Proceedings Article | 5 June 2009 Open Access

Experimental modules covering imaging, diffraction, Fourier optics and polarization based on a liquid-crystal cell SLM

Andreas Hermerschmidt

Proceedings Volume 9666, 96660Q (2009) https://doi.org/10.1117/12.2207974

KEYWORDS: Spatial light modulators, Diffraction, Liquid crystals, Polarizers, Phase shifts, Optical components, Diffraction gratings, Fourier optics, Polarization, Binary data

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Proceedings Article | 25 January 2008 Paper

Holographic optical tweezers with real-time hologram calculation using a phase-only modulating LCOS-based SLM at 1064 nm

Andreas Hermerschmidt, Sven Krüger, Tobias Haist, Susanne Zwick, Michael Warber, Wolfgang Osten

Proceedings Volume 6905, 690508 (2008) https://doi.org/10.1117/12.764649

KEYWORDS: Holograms, Holography, Microscopes, Spatial light modulators, Diffraction, Objectives, Particles, Optical tweezers, Phase modulation, Visualization

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Proceedings Article | 16 May 2007 Paper

Wave front generation using a phase-only modulating liquid-crystal-based micro-display with HDTV resolution

Andreas Hermerschmidt, Stefan Osten, Sven Krüger, Thomas Blümel

Proceedings Volume 6584, 65840E (2007) https://doi.org/10.1117/12.722891

KEYWORDS: Liquid crystals, Phase shift keying, Diffraction, Modulation, Spatial light modulators, Phase modulation, Wavefronts, Diffraction gratings, Molecules, Polarization

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Proceedings Article | 9 May 2007 Paper

Determination of the Jones matrix of an LC cell and derivation of the physical parameters of the LC molecules

Andreas Hermerschmidt, Stephanie Quiram, Frank Kallmeyer, Hans Joachim Eichler

Proceedings Volume 6587, 65871B (2007) https://doi.org/10.1117/12.722895

KEYWORDS: Polarizers, Liquid crystals, Spatial light modulators, Birefringence, Molecules, Polarization, Numerical analysis, Jones matrices, Translucency, Geometrical optics

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Proceedings Article | 9 February 2007 Paper

New HDTV (1920x1080) phase-only SLM

Stefan Osten, Sven Krüger, Andreas Hermerschmidt

Proceedings Volume 6487, 64870X (2007) https://doi.org/10.1117/12.700164

KEYWORDS: Phase shift keying, Spatial light modulators, Diffraction gratings, Diffraction, Liquid crystals, Modulation, Molecules, Wavefronts, Polarization, Phase modulation

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Proceedings Article | 9 June 2006 Paper

High resolution coherent optical reconstruction of digital holograms and their applications

Andreas Hermerschmidt, Günther Wernicke, Sven Krüger, Andreas Langner, Hartmut Gruber, Matthias Dürr

Proceedings Volume 6252, 62521J (2006) https://doi.org/10.1117/12.677161

KEYWORDS: Digital holography, Holograms, LCDs, Modulation, Spatial light modulators, Liquid crystal on silicon, Projection systems, Phase modulation, Image resolution, Phase shift keying

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Proceedings Article | 27 February 2006 Paper

Applications of the high resolution optical reconstruction of digital holograms

Günther Wernicke, Johannes Frank, Hartmut Gruber, Matthias Dürr, Andreas Langner, Stefan Eisebitt, Christian Günther, Larbi Bouamama, Sven Krüger, Andreas Hermerschmidt

Proceedings Volume 6136, 61360Q (2006) https://doi.org/10.1117/12.651622

KEYWORDS: Digital holography, Holograms, Modulation, LCDs, 3D image reconstruction, Phase shift keying, Phase modulation, Spatial light modulators, Liquid crystal on silicon, X-rays

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Proceedings Article | 5 September 2002 Paper

Dual-wavelength bandwidth-narrowed output of a high-power diode laser using a simple extra-cavity

Feng Wang, Andreas Hermerschmidt, Hans Eichler

Proceedings Volume 4913, (2002) https://doi.org/10.1117/12.482217

KEYWORDS: Fabry–Perot interferometers, Semiconductor lasers, High power lasers, Mirrors, Spectroscopy, Space operations, Optical communications, Prisms, Diodes, Solid state lasers

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Proceedings Article | 5 September 2002 Paper

Beam quality improvement of broad-area laser diode with external cavity feedback

Jianhong Ge, Andreas Hermerschmidt, Jun Chen, Zhi Hong, Hans Eichler

Proceedings Volume 4913, (2002) https://doi.org/10.1117/12.482216

KEYWORDS: Mirrors, Semiconductor lasers, Collimation, Broad area laser diodes, Diodes, Prisms, Diffraction gratings, Matrices, Surgery, Diffraction

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Proceedings Article | 6 June 2001 Paper

Bandwidth narrowing of a diode laser array by beam injection using photorefractive double phase conjugation

Andreas Hermerschmidt, F. Wang, Peter Pogany, Hans Eichler

Proceedings Volume 4287, (2001) https://doi.org/10.1117/12.429794

KEYWORDS: Semiconductor lasers, Phase conjugation, Crystals, Laser crystals, Beam splitters, Beam shaping, Oscillators, Mirrors, Laser stabilization, Bridges

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Proceedings Article | 18 June 1998 Paper

Design of diffractive beam-shaping elements for nonuniform illumination waves

Andreas Hermerschmidt, Hans Eichler, Stephan Teiwes, Joerg Schwartz

Proceedings Volume 3291, (1998) https://doi.org/10.1117/12.310592

KEYWORDS: Chemical elements, Beam shaping, Optical components, Speckle, Ions, Numerical simulations, Free space optics, Laser therapeutics, Gaussian beams, Diffraction

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