Dr. Wolfgang Schmidt Profile

Dr. Wolfgang Schmidt

Research Fellow at Leibniz-Institut für Sonnenphysik (KIS)

SPIE Involvement:

Author

Publications (34)

Proceedings Article | 24 August 2024 Poster

Poster

Performance of solar orbiter PHI image stabilisation System (ISS) on ground, during commissioning, and science phase

Reiner Volkmer, Eiji Nakai, Pablo Gutierrez-Marques, Dennis Busse, Johann Hirzberger, Achim Gandorfer, Dietmar Germerott, Martin Kolleck, Thorsten Maue, Jose Maria Gomez Cama, David Roma Dollase, Kinga Albert, David Orozco Suárez, Nestor Albelo Jorge, Thierry Appourchaux, Alberto Alvarez Herrero, Julian Blanco Rodriguez, Lucas Guerrero, Fatima Kahil, Sami Solanki, Jose Carlos del Toro Iniesta, Joachim Woch, Bjoern Fiethe, Isabel Perez Grande, Esteban Sanchis Kilders, Maria Balaguer Martinez, Luis Bellot Rubio, Daniele Calchetti, Manuel Carmona Flores, Werner Deutsch, Alex Feller, German Fernandez Rico, Ana Belen Fernandez Medina Maeso, Pilar Garcia Parejo, Jose Luis Gasent Blesa, Laurent Gizon, Bianca Grauf, Klaus Heerlein, Andreas Lagg, Tobias Lange, Antonio Lopez Jimenez, Reinhard Meller, Harald Michalik, Alejandro Moreno Vacas, Reinhard Müller, Wolfgang Schmidt, Jesper Schou, Udo Schühle, Jonas Sinjan, Hanna Strecker, Jan Staub, Ignacio Torralbo, Gherardo Valori, Thomas Berkefeld

Proceedings Volume 13092, 130927F (2024) https://doi.org/10.1117/12.3021726

KEYWORDS: Image stabilization, Cameras, Calibration, Space operations, Space mirrors, Solar processes, Satellites, Polarimetry, Phase measurement, Mirrors

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Proceedings Article | 29 August 2022 Poster + Paper

Poster + Paper

The on-ground data reduction and calibration pipeline for SO/PHI-HRT

J. Sinjan, D. Calchetti, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodríguez, A. Gandorfer, D. Germerott, L. Guerrero, P. Gutierrez Marquez, F. Kahil, M. Kolleck, S. K. Solanki, J. C. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, J. M. Gómez Cama, I. Pérez-Grande, E. Sanchis Kilders, M. Balaguer Jiménez, L. R. Bellot Rubio, M. Carmona, W. Deutsch, G. Fernandez-Rico, A. Fernández-Medina, P. García Parejo, J. L. Gasent Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Korpi-Lagg, T. Lange, A. López Jiménez, T. Maue, R. Meller, H. Michalik, A. Moreno Vacas, R. Müller, E. Nakai, W. Schmidt, J. Schou, U. Schühle, J. Staub, H. Strecker, I. Torralbo, G. Valori

Proceedings Volume 12189, 121891J (2022) https://doi.org/10.1117/12.2629323

KEYWORDS: Space operations, Modulation, Polarimetry, Magnetism, Sun, Polarization, Demodulation, Calibration, Telescopes, Sensors, Data processing, Image processing

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Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

Image quality of data products of the high resolution telescope of the polarimetric and helioseismic imager

F. Kahil, A. Gandorfer, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Álvarez-Herrero, J. Blanco Rodríguez, D. Germerott, L. Guerrero, P. Gutierrez Marquez, J. Sinjan, D. Calchetti, M. Kolleck, S. Solanki, J. del Toro Iniesta, R. Volkmer, J. Woch, B. Fiethe, J. Gómez Cama, I. Pérez-Grande, E. Sanchis Kilders, M. Balaguer Jiménez, L. Bellot Rubio, M. Carmona, W. Deutsch, G. Fernandez-Rico, A. Fernández-Medina, P. García Parejo, J. Gasent Blesa, L. Gizon, B. Grauf, K. Heerlein, A. Korpi-Lagg, T. Lange, A. López Jiménez, T. Maue, R. Meller, H. Michalik, A. Moreno Vacas, R. Müller, E. Nakai, W. Schmidt, J. Schou, U. Schühle, J. Staub, H. Strecker, I. Torralbo, G. Valori

Proceedings Volume 12180, 121803F (2022) https://doi.org/10.1117/12.2628942

KEYWORDS: Wavefronts, Telescopes, Point spread functions, Image quality, Monochromatic aberrations, Image restoration, Calibration, Sun, Remote sensing, Reconstruction algorithms

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SPIE Journal Paper | 30 July 2019

Subpixel real-time jitter detection algorithm and implementation for polarimetric and helioseismic imager

David Roma, Manuel Carmona, José Bosch, Albert Casas, Atilà Herms, Manel López, Oscar Ruiz, Josep Sabater, Thomas Berkefeld, Thorsten Maue, Eiji Nakai, Wolfgang Schmidt, Dirk Soltau, Reiner Volkmer, José María Gómez

JATIS, Vol. 5, Issue 03, 039003, (July 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.3.039003

KEYWORDS: Detection and tracking algorithms, Lithium, Motion estimation, Polarimetry, Cameras, Imaging systems, Field programmable gate arrays, Sun, Digital signal processing, Image resolution

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

High uniformity IBS coatings for the world’s largest Fabry-Perot etalon of the VTF instrument

L. Pinard, C. Michel, B. Sassolas, J. Teillon, G. Cagnoli, M. Sigwarth, T. Kentischer, W. Schmidt, B. Reichman

Proceedings Volume 10706, 107061R (2018) https://doi.org/10.1117/12.2312007

KEYWORDS: Fabry–Perot interferometers, Mirrors, Optical coatings, Reflectivity, LIGO, Interferometers, Wavefronts, Absorption, Silica, Coating equipment

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Proceedings Article | 6 July 2018 Paper

Paper

Construction update of the Daniel K. Inouye Solar Telescope project

Mark Warner, Thomas Rimmele, Valentin Pillet, Roberto Casini, Steve Berukoff, Simon Craig, Andrew Ferayorni, Bret Goodrich, Robert Hubbard, David Harrington, Paul Jeffers, Erik Johansson, Ruth Kneale, Jeff Kuhn, Chen Liang, Haosheng Lin, Heather Marshall, Mihalis Mathioudakis, William McBride, Joseph McMullin, William McVeigh, Predrag Sekulic, Wolfgang Schmidt, Steve Shimko, Stacey Sueoka, Rich Summers, Alexandra Tritschler, Timothy Williams, Friedrich Wöger

Proceedings Volume 10700, 107000V (2018) https://doi.org/10.1117/12.2314212

KEYWORDS: Telescopes, Optical fabrication, Cameras, Mirrors, Control systems, Solar processes, Observatories, Polarimetry, Imaging systems, Polarization

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Construction of the Daniel K. Inouye Solar Telescope (DKIST) is well underway on the Haleakalā summit on the Hawaiian island of Maui. Featuring a 4-m aperture and an off-axis Gregorian configuration, the DKIST will be the world’s largest solar telescope. It is designed to make high-precision measurements of fundamental astrophysical processes and produce large amounts of spectropolarimetric and imaging data. These data will support research on solar magnetism and its influence on solar wind, flares, coronal mass ejections, and solar irradiance variability. Because of its large aperture, the DKIST will be able to sense the corona’s magnetic field—a goal that has previously eluded scientists—enabling observations that will provide answers about the heating of stellar coronae and the origins of space weather and exo-weather. The telescope will cover a broad wavelength range (0.35 to 28 microns) and operate as a coronagraph at infrared (IR) wavelengths. Achieving the diffraction limit of the 4-m aperture, even at visible wavelengths, is paramount to these science goals. The DKIST’s state-of-the-art adaptive optics systems will provide diffraction-limited imaging, resolving features that are approximately 20 km in size on the Sun.

At the start of operations, five instruments will be deployed: a visible broadband imager (VTF), a visible spectropolarimeter (ViSP), a visible tunable filter (VTF), a diffraction-limited near-IR spectropolarimeter (DLNIRSP), and a cryogenic near-IR spectropolarimeter (cryo-NIRSP). At the end of 2017, the project finished its fifth year of construction and eighth year overall. Major milestones included delivery of the commissioning blank, the completed primary mirror (M1), and its cell. Commissioning and testing of the coudé rotator is complete and the installation of the coudé cleanroom is underway; likewise, commissioning of the telescope mount assembly (TMA) has also begun. Various other systems and equipment are also being installed and tested. Finally, the observatory integration, testing, and commissioning (IT&C) activities have begun, including the first coating of the M1 commissioning blank and its integration within its cell assembly. Science mirror coating and initial on-sky activities are both anticipated in 2018.

Proceedings Article | 6 July 2018 Paper

Paper

The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (PHI) onboard Solar Orbiter

A. Gandorfer, B. Grauf, J. Staub, J. Bischoff, J. Woch, J. Hirzberger, S. Solanki, A. Álvarez-Herrero, P. García Parejo, W. Schmidt, R. Volkmer, T. Appourchaux, J. C. del Toro Iniesta

Proceedings Volume 10698, 106984N (2018) https://doi.org/10.1117/12.2311816

KEYWORDS: Mirrors, Telescopes, Space telescopes, Fabry–Perot interferometers, Optical filters, Polarimetry, Optical alignment, Imaging systems

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Solar Orbiter is a joint mission of ESA and NASA scheduled for launch in 2020. Solar Orbiter is a complete and unique heliophysics mission, combining remote sensing and in-situ analysis; its special elliptical orbit allows viewing the Sun from a distance of only 0.28 AU, and - leaving the ecliptic plane - to observe the solar poles from a hitherto unexplored vantage point. One of the key instruments for Solar Orbiter’s science is the "Polarimetric and Helioseismic Imager" (PHI), which will provide maps of the solar surface magnetic fields and the gas flows on the visible solar surface. Two telescopes, a full disc imager, and a high resolution channel feed a common Fabry-Perot based tunable filter and thus allow sampling a single Fraunhofer line at 617.3 nm with high spectral resolution; a polarization modulation system makes the system sensitive to the full state of polarization. From the analysis of the Doppler shift and the magnetically induced Zeeman polarization in this line, the magnetic field and the line-of-sight gas motions can be detected for each point in the image. In this paper we describe the opto-mechanical system design of the high resolution telescope. It is based on a decentred Ritchey-Chrétien two-mirror telescope. The telescope includes a Barlow type magnifier lens group, which is used as in-orbit focus compensator, and a beam splitter, which sends a small fraction of the collected light onto a fast camera, which provides the error signals for the actively controlled secondary mirror compensating for spacecraft jitter and other disturbances. The elliptical orbit of the spacecraft poses high demands on the thermo-mechanical stability. The varying size of the solar disk image requires a special false-light suppression architecture, which is briefly described. In combination with a heat-rejecting entrance window, the optical energy impinging on the polarimetric and spectral analysis system is efficiently reduced. We show how the design can preserve the diffraction-limited imaging performance over the design temperature range of -20°C to +60°C. The decentred hyperbolical mirrors require special measures for the inter-alignment and their alignment with respect to the mechanical structure. A system of alignment flats and mechanical references is used for this purpose. We will describe the steps of the alignment procedure, and the dedicated optical ground support equipment, which are needed to reach the diffraction limited performance of the telescope. We will also report on the verification of the telescope performance, both - in ambient condition - and in vacuum at different temperatures.

Proceedings Article | 18 August 2016 Paper

Paper

Construction status of the Daniel K. Inouye solar telescope

Joseph McMullin, Thomas Rimmele, Mark Warner, Valentin Pillet, Roberto Casini, Steve Berukoff, Simon Craig, David Elmore, Andrew Ferayorni, Bret Goodrich, Robert Hubbard, David Harrington, Steve Hegwer, Paul Jeffers, Erik Johansson, Jeff Kuhn, Haosheng Lin, Heather Marshall, Mihalis Mathioudakis, William McBride, William McVeigh, LeEllen Phelps, Wolfgang Schmidt, Steve Shimko, Stacey Sueoka, Alexandra Tritschler, Timothy Williams, Friedrich Wöger

Proceedings Volume 9906, 99061B (2016) https://doi.org/10.1117/12.2235227

KEYWORDS: Imaging systems, Observatories, Solar processes, Telescopes, Mirrors, Optical fabrication, Buildings, Space telescopes, Control systems, Deformable mirrors

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We provide an update on the construction status of the Daniel K. Inouye Solar Telescope. This 4-m diameter facility is designed to enable detection and spatial/temporal resolution of the predicted, fundamental astrophysical processes driving solar magnetism at their intrinsic scales throughout the solar atmosphere. These data will drive key research on solar magnetism and its influence on solar winds, flares, coronal mass ejections and solar irradiance variability. The facility is developed to support a broad wavelength range (0.35 to 28 microns) and will employ state-of-the-art adaptive optics systems to provide diffraction limited imaging, resolving features approximately 20 km on the Sun. At the start of operations, there will be five instruments initially deployed: Visible Broadband Imager (VBI; National Solar Observatory), Visible SpectroPolarimeter (ViSP; NCAR High Altitude Observatory), Visible Tunable Filter (VTF (a Fabry-Perot tunable spectropolarimeter); Kiepenheuer Institute for Solarphysics), Diffraction Limited NIR Spectropolarimeter (DL-NIRSP; University of Hawaii, Institute for Astronomy) and the Cryogenic NIR Spectropolarimeter (Cryo-NIRSP; University of Hawaii, Institute for Astronomy).

As of mid-2016, the project construction is in its 4th year of site construction and 7th year overall. Major milestones in the off-site development include the conclusion of the polishing of the M1 mirror by University of Arizona, College of Optical Sciences, the delivery of the Top End Optical Assembly (L3), the acceptance of the Deformable Mirror System (Xinetics); all optical systems have been contracted and are either accepted or in fabrication. The Enclosure and Telescope Mount Assembly passed through their factory acceptance in 2014 and 2015, respectively. The enclosure site construction is currently concluding while the Telescope Mount Assembly site erection is underway. The facility buildings (Utility and Support and Operations) have been completed with ongoing work on the thermal systems to support the challenging imaging requirements needed for the solar research.

Finally, we present the construction phase performance (schedule, budget) with projections for the start of early operations.

Proceedings Article | 9 August 2016 Paper

Paper

End-to-end simulations of the visible tunable filter for the Daniel K. Inouye Solar Telescope

Wolfgang Schmidt, Matthias Schubert, Monika Ellwarth, Jörg Baumgartner, Alexander Bell, Andreas Fischer, Clemens Halbgewachs, Frank Heidecke, Thomas Kentischer, Oskar von der Lühe, Thomas Scheiffelen, Michael Sigwarth

Proceedings Volume 9908, 99084N (2016) https://doi.org/10.1117/12.2232518

KEYWORDS: Tunable filters, Device simulation, Tunable filters, Fabry–Perot interferometers, Visible radiation, Solar telescopes, Magnetism, Modulation, Doppler effect, Iron, Calcium

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Proceedings Article | 9 August 2016 Paper

Paper

Qualification of HEIDENHAIN linear encoders for picometer resolution metrology in VTF Etalons

Clemens Halbgewachs, Thomas Kentischer, Karsten Sändig, Joerg Baumgartner, Alexander Bell, Andreas Fischer, Stefan Funk, Frank Heidecke, Thomas Scheiffelen, Wolfgang Schmidt, Erwin Spanner, Peter Speckbacher, Oskar von der Lühe

Proceedings Volume 9908, 99084H (2016) https://doi.org/10.1117/12.2232297

KEYWORDS: Metrology, Fabry–Perot interferometers, Computer programming, Sensors, Head, Fabry–Perot interferometers, Laser induced plasma spectroscopy, Temperature metrology, Control systems, Electronics, Actuators

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Proceedings Article | 9 August 2016 Paper

Paper

Development of high reflectivity coatings for large format Fabry-Perot etalons

M. Sigwarth, J. Baumgartner, A. Bell, G. Cagnoli, A. Fischer, C. Halbgewachs, F. Heidecke, Th. Kentischer, B. Kestner, P. Kuschnir, O. von der Lühe, L. Pinard, Ch. Michel, W. Reichman, B. Sassolas, Th. Scheiffelen, W. Schmidt

Proceedings Volume 9908, 99084F (2016) https://doi.org/10.1117/12.2232271

KEYWORDS: Fabry–Perot interferometers, Optical coatings, Reflectivity, Silica, Antireflective coatings, Prototyping, Annealing, Ion beam finishing, Thin film coatings, Polishing

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The Visible Tunable Filter (VTF) is a diffraction-limited narrowband tunable instrument for imaging spectropolarimetry in the wavelength range between 520 and 860 nm. It is based on large-format Fabry Perot. The instrument will be one of the first-light instruments of the 4m aperture Daniel K. Inoue Solar Telescope (DKIST). To provide a field of view of 1 arcmin and a spectral resolution λ/Δλ of about 100.000, the required free aperture of the Fabry Perot is 250mm. The high reflectivity coatings for the Etalon plates need to meet the specifications for the reflectivity over the entire wavelength range and preserve the plate figure specifications of better λ/300, and a micro roughness of < 0.4 nm rms. Coated surfaces with similar specifications have successfully been made for reflecting mirrors on thick substrates but not for larger format Fabry-Perot systems. Ion Beam Sputtering (IBS) based coatings provide stable, homogeneous, and smooth coatings. But IBS coatings also introduce stresses to the substrate that influence the plate figure in our case at the nm level. In a joint effort with an industry partner and a French CNRS research laboratory, we developed and tested processes on small and full size substrates, to provide coated Etalon plates to the required specifications. Zygo Extreme Precision Optics, Richmond, CA, USA, is polishing and figuring the substrates, doing the metrology and FE analysis. LMA (Laboratoire Matériaux Avancés, Lyon, France) is designing and making the IBS coatings and investigating the detailed behavior of the coatings and related processes. Both partners provide experience from manufacturing coated plane optics for gravitational wave detection experiments and EUV optics. The Kiepenheuer-Institut für Sonnenphysik, Freiburg, Germany is designing and building the VTF instrument and is leading the coating development. We present the characteristics of the coatings and the substrate processing concept, as well as results from tests on sample size and from full size substrate processing. We demonstrate that the tight specifications for a single Etalon can be reached.

Proceedings Article | 8 August 2016 Paper

Paper

Design and test of a tip-tilt driver for an image stabilization system

Albert Casas, José María Gómez, David Roma, Manuel Carmona, Manel López, José Bosch, Atilà Herms, Josep Sabater, Reiner Volkmer, Frank Heidecke, Thorsten Maue, Eiji Nakai, Jörg Baumgartner, Wolfgang Schmidt

Proceedings Volume 9911, 991123 (2016) https://doi.org/10.1117/12.2232469

KEYWORDS: Amplifiers, Mirrors, Transistors, Actuators, Capacitors, Polarimetry, Control systems, Sun, Imaging systems, Distortion

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Proceedings Article | 4 August 2014 Paper

Paper

System model of an image stabilization system

Manuel Carmona, José María Gómez, David Roma, Albert Casas, Manel López, José Bosch, Atilà Herms, Josep Sabater, Reiner Volkmer, Frank Heidecke, Thorsten Maue, Eiji Nakai, Wolfgang Schmidt

Proceedings Volume 9150, 91501U (2014) https://doi.org/10.1117/12.2054867

KEYWORDS: Cameras, Mirrors, Sensors, Control systems, Sun, Computed tomography, Systems modeling, Image sensors, Electronics, Polarimetry

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Proceedings Article | 23 July 2014 Paper

Paper

Electronics design for a high precision image stabilization system

A. Casas, D. Roma, M. Carmona, J. M. Gómez, J. Bosch, M. López, J. Sabater, A. Herms, T. Maue, E. Nakai, R. Volkmer, W. Schmidt

Proceedings Volume 9154, 91542J (2014) https://doi.org/10.1117/12.2054885

KEYWORDS: Amplifiers, Transistors, Cameras, Sensors, Electronics, Image processing, Field programmable gate arrays, Image sensors, Imaging systems, Control systems

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Proceedings Article | 22 July 2014 Paper

Paper

Construction status of the Daniel K. Inouye Solar Telescope

Joseph McMullin, Thomas Rimmele, Valentin Martínez Pillet, Thomas Berger, Roberto Casini, Simon Craig, David Elmore, Bret Goodrich, Steve Hegwer, Robert Hubbard, Erik Johansson, Jeffrey Kuhn, Haosheng Lin, William McVeigh, Wolfgang Schmidt, Steve Shimko, Alexandra Tritschler, Mark Warner, Friedrich Wöger

Proceedings Volume 9145, 914525 (2014) https://doi.org/10.1117/12.2055483

KEYWORDS: Observatories, Solar telescopes, Optical fabrication, Telescopes, Astronomy, Adaptive optics, Visible radiation, Control systems, Sun, Solar processes

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Proceedings Article | 18 July 2014 Paper

Paper

DKIST visible tunable filter control software: connecting the DKIST framework to OPC UA

Alexander Bell, Clemens Halbgewachs, Thomas Kentischer, Wolfgang Schmidt, Oskar von der Lühe, Michael Sigwarth, Andreas Fischer

Proceedings Volume 9152, 91521D (2014) https://doi.org/10.1117/12.2055583

KEYWORDS: Control systems, Cameras, Optical proximity correction, Photonic integrated circuits, Modulators, Sensors, Fabry–Perot interferometers, Human-machine interfaces, Control systems design, OLE for process control

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Proceedings Article | 8 July 2014 Paper

Paper

A two-dimensional spectropolarimeter as a first-light instrument for the Daniel K. Inouye Solar Telescope

Wolfgang Schmidt, Alexander Bell, Clemens Halbgewachs, Frank Heidecke, Thomas Kentischer, Oskar von der Lühe, Thomas Scheiffelen, Michael Sigwarth

Proceedings Volume 9147, 91470E (2014) https://doi.org/10.1117/12.2056322

KEYWORDS: Fabry–Perot interferometers, Spectral resolution, Polarimetry, Telescopes, Coating, Signal to noise ratio, Sensors, Sun, Doppler effect, Polarization

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Proceedings Article | 8 July 2014 Paper

Paper

The Daniel K. Inouye Solar Telescope first light instruments and critical science plan

David Elmore, Thomas Rimmele, Roberto Casini, Steve Hegwer, Jeff Kuhn, Haosheng Lin, Joseph McMullin, Kevin Reardon, Wolfgang Schmidt, Alexandra Tritschler, Friedrich Wöger

Proceedings Volume 9147, 914707 (2014) https://doi.org/10.1117/12.2057038

KEYWORDS: Visible radiation, Calibration, Solar telescopes, Solar processes, Spatial resolution, Coronagraphy, Near infrared, Data centers, Telescopes, Adaptive optics

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Proceedings Article | 24 September 2012 Paper

Paper

The visible tunable filtergraph for the ATST

T. Kentischer, W. Schmidt, O. von der Lühe, M. Sigwarth, A. Bell, C. Halbgewachs, A. Fischer

Proceedings Volume 8446, 844677 (2012) https://doi.org/10.1117/12.926789

KEYWORDS: Fabry–Perot interferometers, Signal to noise ratio, Reflectivity, Interferometers, Spectroscopy, Polarimetry, Spectral resolution, Collimation, Sun, Telescopes

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Proceedings Article | 21 September 2012 Paper

Paper

Image stabilisation system of the photospheric and helioseismic imager

R. Volkmer, J. Bosch, B. Feger, J. M. Gomez, F. Heidecke, W. Schmidt, T. Scheiffelen, M. Sigwarth, D. Soltau

Proceedings Volume 8442, 84424P (2012) https://doi.org/10.1117/12.926018

KEYWORDS: Cameras, Mirrors, Sensors, Control systems, Imaging systems, Space operations, Field programmable gate arrays, Polarimetry, Optical filters, High speed cameras

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Proceedings Article | 13 September 2012 Paper

Paper

Performance of a laser frequency comb calibration system with a high-resolution solar echelle spectrograph

H.-P. Doerr, T. Kentischer, T. Steinmetz, R. Probst, M. Franz, R. Holzwarth, Th. Udem, T. W. Hänsch, W. Schmidt

Proceedings Volume 8450, 84501G (2012) https://doi.org/10.1117/12.926224

KEYWORDS: Calibration, Spectrographs, Frequency combs, Telescopes, Charge-coupled devices, Spectral calibration, Cameras, Space telescopes, Point spread functions, Spectral resolution

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Proceedings Article | 28 July 2010 Paper

Paper

GREGOR telescope: start of commissioning

R. Volkmer, O. von der Lühe, C. Denker, S. Solanki, H. Balthasar, T. Berkefeld, P. Caligari, M. Collados, C. Halbgewachs, F. Heidecke, A. Hofmann, M. Klvana, F. Kneer, A. Lagg, E. Popow, D. Schmidt, W. Schmidt, M. Sobotka, D. Soltau, K. Strassmeier

Proceedings Volume 7733, 77330K (2010) https://doi.org/10.1117/12.857079

KEYWORDS: Mirrors, Telescopes, Adaptive optics, Cooling systems, Zerodur, Sun, Polarimetry, Solar telescopes, Coating, Visible radiation

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Proceedings Article | 19 July 2010 Paper

Paper

Flight control software for the wave-front sensor of SUNRISE 1m balloon telescope

Alexander Bell, Peter Barthol, Thomas Berkefeld, Bernhard Feger, Achim Gandorfer, Frank Heidecke, Michael Knoelker, Valentin Pillet, Wolfgang Schmidt, Michael Sigwarth, Sami Solanki, Dirk Soltau, Alan Title

Proceedings Volume 7740, 774003 (2010) https://doi.org/10.1117/12.857003

KEYWORDS: Telescopes, Sensors, Picosecond phenomena, Space telescopes, Mirrors, Control systems, Telecommunications, Computing systems, Cameras

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Proceedings Article | 9 July 2008 Paper

Paper

ChroTel: a robotic telescope to observe the chromosphere of the Sun

T. Kentischer, Ch. Bethge, D. Elmore, R. Friedlein, C. Halbgewachs, M. Knölker, H. Peter, W. Schmidt, M. Sigwarth, K. Streander

Proceedings Volume 7014, 701413 (2008) https://doi.org/10.1117/12.789044

KEYWORDS: Telescopes, Optical filters, Mirrors, Sun, Lenses, Image filtering, Cameras, Robotics, Sensors, Charge-coupled devices

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Proceedings Article | 27 June 2006 Paper

Paper

Auto alignment and image tracking system for the SUNRISE telescope

W. Schmidt, T. Berkefeld, B. Feger, R. Friedlein, K. Gerber, F. Heidecke, T. Kentischer, O. v. d. Lühe, M. Sigwarth, D. Soltau, E. Wälde

Proceedings Volume 6274, 62740H (2006) https://doi.org/10.1117/12.669955

KEYWORDS: Telescopes, Adaptive optics, Mirrors, Sun, Monochromatic aberrations, Wavefront sensors, Servomechanisms, Sensors, Cameras

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Proceedings Article | 23 June 2006 Paper

Paper

SUNRISE: high-resolution UV/VIS observations of the Sun from the stratosphere

A. Gandorfer, S. Solanki, P. Barthol, B. Lites, V. Martínez Pillet, W. Schmidt, D. Soltau, A. Title

Proceedings Volume 6267, 62670S (2006) https://doi.org/10.1117/12.672828

KEYWORDS: Telescopes, Magnetism, Image filtering, Mirrors, Optical filters, CCD cameras, Sun, Solar processes, Wavefront sensors, Polarization

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Proceedings Article | 23 June 2006 Paper

Paper

The new 1.5m solar telescope GREGOR: first light and start of commissioning

Reiner Volkmer, Oskar von der Lühe, Franz Kneer, Jürgen Staude, Thomas Berkefeld, Peter Caligari, Clemens Halbgewachs, Frank Heidecke, Wolfgang Schmidt, Dirk Soltau, Harald Nicklas, Axel Wittmann, Horst Balthasar, Axel Hofmann, Klaus Strassmeier, Michal Sobotka, Miroslav Klvana, Manuel Collados

Proceedings Volume 6267, 62670W (2006) https://doi.org/10.1117/12.671165

KEYWORDS: Mirrors, Telescopes, Adaptive optics, Solar telescopes, Control systems, Integrated optics, Polarimetry, Optical benches, Manufacturing, Silicon carbide

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Proceedings Article | 15 September 2005 Paper

Paper

The new 1.5 solar telescope GREGOR: progress report and results of performance tests

Reiner Volkmer, Oskar von der Lühe, Franz Kneer, Jürgen Staude, Thomas Berkefeld, Peter Caligari, Clemens Halbgewachs, Wolfgang Schmidt, Dirk Soltau, Harald Nicklas, Axel Wittmann, Horst Balthasar, Axel Hofmann, Klaus Strassmeier, Michal Sobotka, Miroslav Klvana, Manuel Collados

Proceedings Volume 5901, 590108 (2005) https://doi.org/10.1117/12.618247

KEYWORDS: Telescopes, Mirrors, Control systems, Space telescopes, Solar telescopes, Adaptive optics, Manufacturing, Optical alignment, Spectrographs, Deformable mirrors

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Proceedings Article | 28 September 2004 Paper

Paper

High-precision wavefront sensor for the SUNRISE Telescope

Wolfgang Schmidt, Thomas Berkefeld, Ruediger Friedlein, Frank Heidecke, Thomas Kentischer, Oskar von der Luhe, Michael Sigwarth, Dirk Soltau, E. Walde

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.549769

KEYWORDS: Telescopes, Mirrors, Wavefront sensors, Calibration, Sun, Monochromatic aberrations, Sensors, Wavefronts, Motion measurement

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Proceedings Article | 28 September 2004 Paper

Paper

Progress report of the 1.5 m solar telescope GREGOR

Reiner Volkmer, Oskar von der Lühe, Franz Kneer, Jurgen Staude, Thomas Berkefeld, Peter Caligari, Wolfgang Schmidt, Dirk Soltau, Harald Nicklas, Eberhardt Wiehr, Axel Wittmann, Horst Balthasar, Axel Hofmann, Klaus Strassmeier, Michal Sobotka, Miroslav Klvana, Manuel Collados

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.551577

KEYWORDS: Telescopes, Mirrors, Control systems, Adaptive optics, Spectrographs, Space telescopes, Solar telescopes, Domes, Spectroscopy, Optics manufacturing

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Proceedings Article | 28 September 2004 Paper

Paper

SUNRISE: high-resolution UV/VIS observations of the Sun from the stratosphere

Achim Gandorfer, Sami Solanki, Manfred Schussler, Werner Curdt, Bruce Lites, Valentin Martinez Pillet, Wolfgang Schmidt, Alan Title

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.549119

KEYWORDS: Magnetism, Telescopes, Mirrors, CCD cameras, Optical filters, Image filtering, Solar processes, Sun, Polarimetry, Imaging systems

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Proceedings Article | 11 February 2003 Paper

Paper

SUNRISE: a balloon-borne telescope for high resolution solar observations in the visible and UV

Sami Solanki, Achim Gandorfer, Manfred Schuessler, W. Curdt, Bruce Lites, Valentin Martinez-Pillet, Wolfgang Schmidt, Alan Title

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460283

KEYWORDS: Magnetism, Telescopes, Mirrors, Solar processes, Optical filters, CCD cameras, Ultraviolet radiation, Polarimetry, Sun, Polarization

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Proceedings Article | 11 February 2003 Paper

Paper

GREGOR: the new 1.5-m solar telescope on Tenerife

Reiner Volkmer, Oskar von der Luehe, Franz Kneer, Juergen Staude, Axel Hofmann, Wolfgang Schmidt, Michal Sobotka, Dirk Soltau, Eberhardt Wiehr, Axel Wittmann, Thomas Berkefeld

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.471367

KEYWORDS: Telescopes, Adaptive optics, Mirrors, Space telescopes, Solar telescopes, Spectrographs, Polarimetry, Magnetism, Sun, Observatories

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Proceedings Article | 11 February 2003 Paper

Paper

Lightweight Cesic mirrors and their applications

Norbert Pailer, Matthias Kroedel, William Rosenberg, Wolfgang Schmidt, Oskar von der Luehe

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460274

KEYWORDS: Mirrors, Polishing, Optics manufacturing, Silicon carbide, Surface finishing, Lightweight mirrors, Ceramics, Manufacturing, Silicon, Interfaces

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Showing 5 of 34 publications

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