Dr. Stefan Schwinde Profile

Dr. Stefan Schwinde

at Fraunhofer IOF

SPIE Involvement:

Author

Publications (17)

Proceedings Article | 26 August 2024 Presentation

Presentation

Metallic freeform optics for the cold optic instrument of MICADO (Conference Presentation)

Jan Kinast, Markus Unger, Sandra Müller, Mathias Rohde, Benjamin Quaiser, Robert Jende, Peter Weide, Knut Kleinbauer, Ralf Steinkopf, Tatjana Porwol, Luxuan Cai, Jonas Tabbert, Corona Schmalian, Antonia Clara Klein, Svetlana Shestaeva, Stefan Schwinde, Johannes Hartung, Thomas Peschel, Andreas Gebhardt, Stefan Risse

Proceedings Volume 13100, 1310009 (2024) https://doi.org/10.1117/12.3019918

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Proceedings Article | 26 August 2024 Presentation

Presentation

Optimization of Protected Silver Coating Recipes for E-ELT Telescope Mirrors (Conference Presentation)

Ronald Holzlöhner, Michele Cirasuolo, Ricardo Parra, Svetlana Shestaeva, Stefan Schwinde

Proceedings Volume 13100, 1310020 (2024) https://doi.org/10.1117/12.3019915

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Proceedings Article | 24 June 2024 Presentation + Paper

Presentation + Paper

Thin film black coatings based on interference and absorption

P. Munzert, S. Schwinde, R. Leitel, S. Kleinle, S. Shestaeva, R. Schlegel, T. Herffurth, S. Schröder

Proceedings Volume 13020, 1302004 (2024) https://doi.org/10.1117/12.3022694

KEYWORDS: Optical coatings, Reflectivity, Metals, Thin film coatings, Spectroscopy, Antireflective coatings, Thin films, Reflection, Glasses, Prisms

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Proceedings Article | 17 June 2024 Presentation + Paper

Presentation + Paper

Design and manufacturing of a metallic telescope for ground-based quantum communication

M. Unger, N. Heidler, T. Peschel, C. Damm, R. Jende, P. Weide, K. Kleinbauer, R. Steinkopf, T. Porwol, S. Müller, M. Rohde, J. Hartung, C. Jäger, S. Shestaeva, R. Schlegel, S. Schwinde, M. Goy, F. Steinlechner, S. Risse

Proceedings Volume 13021, 1302105 (2024) https://doi.org/10.1117/12.3022982

KEYWORDS: Mirrors, Optical surfaces, Telescopes, Manufacturing, Mirror surfaces, Quantum systems, Quantum communications, Chemical mechanical planarization, Magnetorheological finishing, Quantum networks

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Quantum communication is considered to be a key feature for secure communication e.g. between government organisations or other institutions with high security requirements. Therefore, the QuNET initiative was founded. It focuses on developing a quantum-secure German governmental agency network based on quantum key distribution (QKD). Free-space optical (FSO) links are a valuable part of infrastructure because they can be deployed temporarily, such as at summits or to bridge the last miles where there is no fiber infrastructure. In particular, high-throughput telescopes are of great importance as optical antennas for terrestrial networks or links between mobile nodes. The paper describes the development and manufacturing of an unobscured, afocal four-mirror metal telescope which is already tested for ground-based quantum communication. The off-axis system, operating with a full telescope aperture of 200 mm, a magnification of 20x, and a FOV (field of view) of 3.5 mrad and is designed to yield diffraction-limited performance for an operational wavelength of 810 nm and 1550 nm. The addressed wavefront error-target of the whole system amounts to 66 nm RMS (root mean square). The use case of the telescope implied an operational temperature range of -40 °C up to +50 °C. Therefore, an athermal system is realized using an aluminum-silicon alloy substrate material combined with a nickel-phosphorus polishing layer that allows to reach the required surface quality of the mirrors. To simplify the alignment of the telescope, its mechanical concept relies on a snap-together approach using two substrates with two optical mirrors on a common substrate, each. The manufacturing chain of these two so called mirror substrates is described in detail. That includes the CNC pre-manufacturing, ultra precision diamond turning and subsequent polishing steps. The resulting quality of the mirror substrates as well as of the telescope system is demonstrated by optical measurements using interferometric setups.

Proceedings Article | 12 July 2023 Open Access

Open Access

Paper

Realizing an all-glass beam splitter for space by using advanced joining technologies

Carolin Rothhardt, Pascal Birckigt, Kevin Grabowski, Stefan Risse, Ralph Schlegel, Svetlana Shestaeva, Stefan Schwinde, Sebastian Schmidl, Sylvio Klose

Proceedings Volume 12777, 1277719 (2023) https://doi.org/10.1117/12.2689276

KEYWORDS: Beam splitters, Coating, Prisms, Cryogenics, Silicates, Tunable filters, Surface finishing, Silicon, Tantalum, Astronomical imaging

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Proceedings Article | 12 July 2023 Open Access

Open Access

Paper

Black aperture coating with an anti-reflective clear aperture: developed and qualified for space-based applications

S. Schwinde, P. Munzert, S. Shestaeva, R. Leitel, S. Kleinle, S. Schröder

Proceedings Volume 12777, 127775I (2023) https://doi.org/10.1117/12.2691027

KEYWORDS: Coating, Prisms, Antireflective coatings, Stray light, Astronomical imaging, Transmittance, Reflectivity, Optical surfaces, Optical components, Visual inspection

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Development of advanced silver coatings for telescope mirrors

S. Schwinde, S. Shestaeva, R. Holzlöhner, G. Willers, R. Schlegel, A. Förster, R. Parra, S. Guisard, O. Sqalli, S. Schröder

Proceedings Volume 12188, 121881X (2022) https://doi.org/10.1117/12.2627710

KEYWORDS: Reflectivity, Silver, Mirrors, Telescopes, Optical coatings, Aluminum, Reflector telescopes, Gemini Observatory, Gold, Ruthenium, Near ultraviolet

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Electron microscopy studies of contaminated telescope mirror samples exposed at Paranal

Guido Willers, Ronald Holzlöhner, Volker Naumann, Stefan Schwinde, Stéphane Guisard

Proceedings Volume 12188, 121881Z (2022) https://doi.org/10.1117/12.2627690

KEYWORDS: Particles, Mirrors, Aluminum, Telescopes, Silver, Corrosion, Reflectivity, Chlorine, Glasses, Cements

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Proceedings Article | 27 August 2022 Presentation + Paper

Presentation + Paper

Development and manufacturing of the receiver telescope for the Ganymede Laser Altimeter (GALA)

Henrik von Lukowicz, Johannes Hartung, Robert Jende, Sandra Müller, Mathias Rohde, Jan Kinast, Knut Kleinbauer, Svetlana Shestaeva, Stefan Schwinde, Thomas Peschel, Kai Weidlich, Henry Wegert, Stefan Risse

Proceedings Volume 12180, 121800H (2022) https://doi.org/10.1117/12.2631688

KEYWORDS: Mirrors, Telescopes, Manufacturing, Interfaces, Diamond turning, Coating, Reflectivity, Receivers, Optics manufacturing, Jupiter

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Proceedings Article | 11 June 2021 Open Access

Open Access

Presentation + Paper

Au coatings for spaced based reflectors

Stefan Schwinde, Svetlana Shestaeva, Sven Stempfhuber, Henrik von Lukowicz, Jochen Kuhnhenn, Sven Schröder

Proceedings Volume 11852, 118521Q (2021) https://doi.org/10.1117/12.2599299

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Échelle grating with improved polarization characteristics used for Earth observation

Susann Sadlowski, Torsten Harzendorf, Stefan Schwinde, Frank Burmeister, Dirk Michaelis, Thomas Flügel-Paul, Uwe Zeitner

Proceedings Volume 11451, 114511D (2020) https://doi.org/10.1117/12.2562546

KEYWORDS: Polarization, Diffraction gratings, Optics manufacturing, Optical design, Crystals, Diffraction, Silicon, Earth's atmosphere, Spectroscopic atmospheric monitoring techniques, Spectral resolution

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Proceedings Article | 12 July 2019 Open Access

Open Access

Paper

Protected silver coatings for reflectors

Stefan Schwinde, Mark Schürmann, Ralph Schlegel, Jan Kinast, Reinhold Dorn, Jean Louis Lizon, Sebastien Tordo, Norbert Kaiser

Proceedings Volume 11180, 111804M (2019) https://doi.org/10.1117/12.2536085

KEYWORDS: Silicon, Aluminum, Reflectors, Sputter deposition, Silver, Argon, Resistance, Reflectivity, Oxygen, Infrared spectroscopy

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Proceedings Article | 5 June 2018 Paper

Paper

Si/SiO2-based filter coatings for astronomical applications in the IR spectral range

R. Schlegel, D. Gäbler, M. Schürmann, R. Follert, U. Seemann, E. Oliva, S. Schwinde

Proceedings Volume 10691, 106911E (2018) https://doi.org/10.1117/12.2311310

KEYWORDS: Refractive index, Optical coatings, Silicon, Germanium, Optical filters, Annealing, Sputter deposition

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Proceedings Article | 5 June 2018 Paper

Paper

Optical characterisation of silver mirrors protected with transparent overcoats

A. Sytchkova, S. Schwinde, M. L. Protopapa, M. Palmisano, A. Piegari, M. Schürmann, N. Kaiser

Proceedings Volume 10691, 106910N (2018) https://doi.org/10.1117/12.2312077

KEYWORDS: Silver, Mirrors, Optical coatings, Dielectrics, Data modeling, Oxides, Refractive index, Sputter deposition

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Proceedings Article | 17 November 2017 Open Access

Open Access

Paper

High-reflective coatings for ground and space based applications

M. Schürmann, S. Schwinde, P. Jobst, O. Stenzel, S. Wilbrandt, A. Szeghalmi, A. Bingel, P. Munzert, N. Kaiser

Proceedings Volume 10563, 105630M (2017) https://doi.org/10.1117/12.2304172

KEYWORDS: Silver, Optical coatings, Reflectivity, Aluminum, Atomic layer deposition, Particles, Contamination, Mirrors, Multilayers, Humidity

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Proceedings Article | 22 July 2016 Paper

Paper

Manufacturing and coating of optical components for the EnMAP hyperspectral imager

M. Schürmann, D. Gäbler, R. Schlegel, S. Schwinde, T. Peschel, C. Damm, R. Jende, J. Kinast, S. Müller, M. Beier, S. Risse, B. Sang, M. Glier, H. Bittner, M. Erhard

Proceedings Volume 9912, 991230 (2016) https://doi.org/10.1117/12.2232914

KEYWORDS: Mirrors, Coating, Prisms, Imaging systems, Antireflective coatings, Spectrometers, Surface finishing, Telescopes, Silver, Short wave infrared radiation

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Proceedings Article | 23 September 2015 Paper

Paper

Protected and enhanced silver for mirrors: damage mechanisms and how to prevent them

S. Schwinde, M. Schürmann, Norbert Kaiser, Andreas Tünnermann

Proceedings Volume 9627, 96271R (2015) https://doi.org/10.1117/12.2191216

KEYWORDS: Silver, Reflectivity, Corrosion, Particles, Mirrors, Metals, Refractive index, Aluminum, Sensors, Gold

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Showing 5 of 17 publications

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