Prof. Oskar F. von der Lühe Profile

Prof. Oskar F. von der Lühe

Scientific Director (retired) at Leibniz-Institut für Sonnenphysik (KIS)

SPIE Involvement:

Conference Program Committee | Author

Publications (47)

SPIE Journal Paper | 2 November 2017 Open Access

Simulation algorithm to model the visible tunable filter for the Daniel K. Inouye Solar Telescope

Matthias Schubert, Thomas Kentischer, Oskar von der Lühe

JATIS, Vol. 3, Issue 04, 045002, (November 2017) https://doi.org/10.1117/12.10.1117/1.JATIS.3.4.045002

KEYWORDS: Computer simulations, Reflectivity, Fabry–Perot interferometers, Device simulation, Tunable filters, Algorithm development, Magnetism, Systems modeling, Solar telescopes, Sensors

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Proceedings Article | 18 October 2017 Presentation

Local optical turbulence at and in the vicinity of the GREGOR solar telescope (Conference Presentation)

Oskar von der Lühe, Thomas Berkefeld, Detlev Sprung, Erik Sucher, Karin Stein

Proceedings Volume 10425, 104250C (2017) https://doi.org/10.1117/12.2279432

KEYWORDS: Optical turbulence, Telescopes, Image quality, Turbulence, Solar telescopes, Observatories, Adaptive optics, Refractive index, Earth's atmosphere, Atmospheric optics

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The image quality of ground-based solar telescopes depends on the amount of turbulence in the Earth’s atmosphere, which is strongest in layers close to the ground during daytime. Local optical turbulence affects the performance of adaptive optical systems and reduces the spatial resolution of solar observations. Increased turbulence which is caused by solar irradiation of the infrastructure close to the telescope and obstructions to a free airflow are major concerns, but difficult to detect and to monitor. We have conducted measurements of optical turbulence at the GREGOR solar telescope (Teide Observatory, Tenerife, Canary Islands) to assess quantitatively the influence of the infrastructure on the image quality. The strength of optical turbulence is determined by the structure function parameter of the refractive index Cn2. We have measured the temporal behavior of the free flow optical turbulence about 30m above ground using a laser scintillometer between the towers of the Vacuum Tower Telescope and of GREOR. Local measurements of Cn2 were taken on the observing platform of GREGOR using three ultrasonic anemometers. Two anemometers are located at the north and south ends of the telescope building, a third one was be placed close to the telescope main mirror cell. Air temperature, pressure, humidity as well as wind speed and direction were measured along with refractive index measurements. An image quality indicator based on an estimate of the Fried parameter r0 was recorded whenever the adaptive optics system GAOS at the GREGOR telescope was operating. Recordings of the net solar radiation were obtained from the GONG experiment which is located a few 100 m from GREGOR. All data were taken between May 2015 and March 2016. We investigate the relation between optical turbulence, solar irradiance and meteorological parameters. Under almost all conditions, optical turbulence nearby the telescope is stronger than free flow turbulence. We note significant dependencies of the strength and the horizontal gradient of Cn2 on wind direction. The moderate influence on image quality indicates that there is only a thin layer with strong turbulence just above the telescope.

Proceedings Article | 19 October 2016 Paper

Characterization of optical turbulence at the GREGOR solar telescope: temporal and local behavior and its influence on the solar observations

D. Sprung, E. Sucher, K. Stein, O. von der Lühe, Th. Berkefeld

Proceedings Volume 10002, 1000205 (2016) https://doi.org/10.1117/12.2245479

KEYWORDS: Telescopes, Optical turbulence, Turbulence, Solar telescopes, Adaptive optics, Refractive index, Observatories, Ultrasonics, Temperature metrology, Receivers

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Proceedings Article | 9 August 2016 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

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

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 | 21 July 2014 Paper

GREGOR MCAO looking at the Sun

Dirk Schmidt, Thomas Berkefeld, Frank Heidecke, Andreas Fischer, Oskar von der Lühe, Dirk Soltau

Proceedings Volume 9148, 91481T (2014) https://doi.org/10.1117/12.2055154

KEYWORDS: Wavefront sensors, Adaptive optics, Telescopes, Deformable mirrors, Wavefronts, Image sensors, Sun, Solar telescopes, Sensors, Mirrors

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Proceedings Article | 18 July 2014 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

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 | 17 October 2013 Paper

Solar adaptive optics at the Observatorio del Teide, Tenerife

Dirk Soltau, Thomas Berkefeld, Dirk Schmidt, Oskar von der Lühe

Proceedings Volume 8890, 88901D (2013) https://doi.org/10.1117/12.2032382

KEYWORDS: Adaptive optics, Telescopes, Cameras, Sun, Actuators, Mirrors, Lanthanum, Turbulence, Sensors, Wavefront sensors

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Proceedings Article | 24 September 2012 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 | 28 July 2010 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 | 18 September 2009 Paper

Testbed for the multi-conjugate adaptive optics system of the solar telescope GREGOR

Dirk Schmidt, T. Berkefeld, F. Heidecke, O. von der Lühe, D. Soltau

Proceedings Volume 7439, 74390X (2009) https://doi.org/10.1117/12.829886

KEYWORDS: Mirrors, Telescopes, Wavefront sensors, Adaptive optics, Deformable mirrors, Actuators, Cameras, Sensors, Microlens, Microlens array

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Proceedings Article | 15 July 2008 Paper

Turbulence profiling using wide field of view Hartmann-Shack wavefront sensors

T. Waldmann, T. Berkefeld, O. von der Lühe

Proceedings Volume 7015, 70155O (2008) https://doi.org/10.1117/12.789553

KEYWORDS: Turbulence, Telescopes, Computer simulations, Precision measurement, Profiling, Device simulation, Wavefront sensors, Adaptive optics, Atmospheric turbulence, Image resolution

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Proceedings Article | 15 July 2008 Paper

KISIP: a software package for speckle interferometry of adaptive optics corrected solar data

Friedrich Wöger, Oskar von der Lühe

Proceedings Volume 7019, 70191E (2008) https://doi.org/10.1117/12.788062

KEYWORDS: Adaptive optics, Reconstruction algorithms, Speckle, Telescopes, Speckle interferometry, Solar telescopes, Computing systems, Detection and tracking algorithms, Data modeling, Satellites

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Proceedings Article | 9 July 2008 Paper

Polarization effects in Fabry-Pérot interferometer-based solar spectrometers

H.-P. Doerr, O. von der Lühe, T. Kentischer

Proceedings Volume 7014, 701417 (2008) https://doi.org/10.1117/12.789180

KEYWORDS: Polarization, Fabry–Perot interferometers, Point spread functions, Polarimetry, Interferometers, Reflection, Spectrometers, Multilayers, Reflectivity, Collimation

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Proceedings Article | 16 May 2007 Paper

Optical wavefront differentiation: wavefront sensing for solar adaptive optics based on a LCD

Dirk Schmidt, Oskar von der Lühe

Proceedings Volume 6584, 658408 (2007) https://doi.org/10.1117/12.722640

KEYWORDS: Wavefronts, LCDs, Wavefront sensors, Adaptive optics, Telescopes, Mirrors, Sun, Projection systems, Monochromatic aberrations, Cameras

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Proceedings Article | 27 June 2006 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 | 27 June 2006 Paper

Multi-conjugate solar adaptive optics with the VTT and GREGOR

Thomas Berkefeld, Dirk Soltau, Oskar von der Lühe

Proceedings Volume 6272, 627205 (2006) https://doi.org/10.1117/12.671718

KEYWORDS: Adaptive optics, Telescopes, Turbulence, Mirrors, Actuators, Wavefront reconstruction, Solar telescopes, Stars, Correlation function, Wavefront sensors

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Proceedings Article | 23 June 2006 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

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 | 25 August 2005 Paper

Results of the Multi-conjugate Adaptive Optics System at the German Solar Telescope, Tenerife

Thomas Berkefeld, Dirk Soltau, Oskar von der Luehe

Proceedings Volume 5903, 59030O (2005) https://doi.org/10.1117/12.619132

KEYWORDS: Adaptive optics, Mirrors, Telescopes, Cameras, Solar telescopes, Wavefront sensors, Stars, Actuators, Beam splitters, Turbulence

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Proceedings Article | 25 October 2004 Paper

Photometric stability of multiconjugate adaptive optics

Oskar von der Luhe

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.553053

KEYWORDS: Telescopes, Distortion, Adaptive optics, Turbulence, Deformable mirrors, Solids, Ray tracing, Video, Spatial resolution, Point spread functions

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Proceedings Article | 25 October 2004 Paper

Second-generation adaptive optics for the 1.5 m solar telescope GREGOR, Tenerife

Thomas Berkefeld, Dirk Soltau, Oskar von der Luhe

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.555505

KEYWORDS: Adaptive optics, Mirrors, Cameras, Turbulence, Solar telescopes, Telescopes, Deformable mirrors, Diffraction, Wavefront sensors, Actuators

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Proceedings Article | 28 September 2004 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

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

GISOT: a giant solar telescope

Robert Hammerschlag, Oskar von der Luhe, Felix Bettonvil, Aswin Jagers, Frans Snik

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.550513

KEYWORDS: Mirrors, Telescopes, Solar telescopes, Point spread functions, Adaptive optics, Space telescopes, Diffraction, Off axis mirrors, Optical components, Modulation transfer functions

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Proceedings Article | 12 December 2003 Paper

Optical and thermal design of the main optic of the solar telescope GREGOR

Reiner Volkmer, Oskar von der Luhe, Dirk Soltau, Peter Emde, Matthias Krodel, Norbert Pailer, Eberhardt Wiehr

Proceedings Volume 5179, (2003) https://doi.org/10.1117/12.506710

KEYWORDS: Mirrors, Telescopes, Thermography, Solar telescopes, Thermal analysis, Zerodur, Optical instrument design, Optical design, Solar radiation, Radiation effects

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Proceedings Article | 11 February 2003 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

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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Proceedings Article | 7 February 2003 Paper

Multiconjugate adaptive optics at the Vacuum Tower Telescope, Tenerife

Thomas Berkefeld, Dirk Soltau, Oskar von der Luhe

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.459799

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Wavefront sensors, Actuators, Turbulence, Deformable mirrors, Cameras, Correlation function, Wavefront aberrations

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Proceedings Article | 29 January 2002 Paper

Multiconjugate adaptive optics at the Vacuum Tower Telescope, Tenerife

Thomas Berkefeld, Dirk Soltau, Oskar von der Luehe

Proceedings Volume 4538, (2002) https://doi.org/10.1117/12.454398

KEYWORDS: Adaptive optics, Mirrors, Telescopes, Actuators, Wavefront sensors, Cameras, Micromirrors, Turbulence, Deformable mirrors, Correlation function

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Proceedings Article | 29 January 2002 Paper

Adaptive optics system for a 1.5-m solar telescope

Oskar von der Luehe, Thomas Berkefeld, Dirk Soltau

Proceedings Volume 4538, (2002) https://doi.org/10.1117/12.454408

KEYWORDS: Adaptive optics, Mirrors, Telescopes, Actuators, Wavefronts, Sensors, Solar telescopes, Observatories, Wavefront sensors, Deformable mirrors

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Proceedings Article | 5 July 2000 Paper

10-um interferometry on the VLTI with the MIDI instrument: a preview

Christoph Leinert, Uwe Graser, Laurens Waters, Guy Perrin, Bruno Lopez, Vincent Coude du Foresto, Annelie Glazenborg-Kluttig, Johannes de Haas, Thomas Herbst, Walter Jaffe, Pierre Lena, Rainer Lenzen, Rudolf le Poole, Sebastiano Ligori, Reinhard Mundt, Jan-Willem Pel, Irene Porro, Oskar von der Luehe

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390236

KEYWORDS: Interferometry, Telescopes, Sensors, Visibility, Interferometers, Cameras, Mid-IR, Astatine, Optical filters, Modulation

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Proceedings Article | 5 July 2000 Paper

Science opportunities with AMBER, the near-IR VLTI instrument

Andrea Richichi, Thomas Bloecker, Renaud Foy, Didier Fraix-Burnet, Bruno Lopez, Fabien Malbet, Philippe Stee, Oskar von der Luehe, Gerd Weigelt

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390266

KEYWORDS: Stars, Spatial resolution, Visibility, Interferometry, Interferometers, Telescopes, Exoplanets, Spectral resolution, Astatine, Data modeling

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Proceedings Article | 21 March 1997 Paper

Results of studies on the environmental factors affecting the VLTI performance

Bertrand Koehler, Samuel Leveque, Oskar von der Luehe

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269081

KEYWORDS: Telescopes, Acoustics, 3D modeling, Interferometry, Interferometers, Mirrors, Head, Turbulence, Electronics, Optical instrument design

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Proceedings Article | 21 March 1997 Paper

Interferometry with the ESO Very Large Telescope

Oskar von der Luehe, Frederic Derie, Bertrand Koehler, Samuel Leveque, Francesco Paresce, Massimo Verola

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269074

KEYWORDS: Telescopes, Interferometry, Large telescopes, Adaptive optics, Stars, Infrared telescopes, Interferometers, Diffraction, Observatories, Ultraviolet telescopes

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Proceedings Article | 21 March 1997 Paper

Optical path difference model for the Very Large Telescope Interferometer

Samuel Leveque, Bertrand Koehler, Oskar von der Luehe

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269082

KEYWORDS: Stars, Telescopes, Calibration, Interferometers, Switching, Protactinium, Astronomical imaging, Large telescopes, Astronomy, Interferometry

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Proceedings Article | 12 October 1996 Paper

Kilometric baseline space interferometry

Pierre Bely, Robin Laurance, Sergio Volonte, Alain Greenaway, Christopher Haniff, Mario Lattanzi, Jean-Marie Mariotti, Jacco Noordam, Farrokh Vakili, Oskar von der Luehe, Herve Lambert, Bertrand Calvel, Richard Scaddan, Paul Vangasse

Proceedings Volume 2807, (1996) https://doi.org/10.1117/12.255123

KEYWORDS: Stars, Telescopes, Space telescopes, Space operations, Interferometers, Mirrors, Observatories, Laser metrology, Interferometry, Active optics

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Proceedings Article | 16 October 1995 Paper

Ultraviolet Coronagraph Spectrometer for the Solar and Heliospheric Observatory: instrument description and calibration overview

John Kohl, R. Esser, Larry Gardner, Shadia Habbal, Peter Daigneau, George Nystrom, John Raymond, Leonard Strachan, A. van Ballegooijen, Giancarlo Noci, Silvano Fineschi, Marco Romoli, A. Ciaravella, Andrea Modigliani, Martin Huber, Ester Antonucci, C. Benna, Silvio Giordano, Oskar von der Luehe, Giuseppe Tondello, Piergiorgio Nicolosi, Giampiero Naletto, Claudio Pernechele, J. Geiss, George Gloeckler, G. Poletto, D. Spadaro, A. Allegra, Giuseppe Basile, R. Brusa, B. Wood, Oswald Siegmund

Proceedings Volume 2517, (1995) https://doi.org/10.1117/12.224917

KEYWORDS: Spectroscopy, Coronagraphy, Calibration, Ultraviolet radiation, Observatories, Visible radiation, Polarimetry, Reflector telescopes, Ultraviolet telescopes, Telescopes

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Proceedings Article | 23 August 1995 Paper

Measurement of optical path fluctuations due to internal seeing for the VLTI

Samuel Leveque, Bertrand Koehler, Oskar von der Luehe

Proceedings Volume 2566, (1995) https://doi.org/10.1117/12.217370

KEYWORDS: Temperature metrology, Interferometers, Turbulence, Atmospheric optics, Atmospheric modeling, Atmospheric propagation, Wavefronts, Control systems, Optical testing, Metrology

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Proceedings Article | 23 August 1995 Paper

Interferometry with the ESO Very Large Telescope

Oskar von der Luehe, Frederic Derie, Didier Ferrand, Bertrand Koehler, Samuel Leveque, Francesco Paresce, Luigi D'Arcio

Proceedings Volume 2566, (1995) https://doi.org/10.1117/12.217366

KEYWORDS: Telescopes, Interferometry, Space telescopes, Interferometers, Turbulence, Control systems, Astatine, Mirrors, Large telescopes, Observatories

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Proceedings Article | 9 June 1994 Paper

Engineering aspects of the environmental factors affecting the VLTI performance

Bertrand Koehler, Oskar von der Luehe

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177238

KEYWORDS: 3D modeling, Mirrors, Telescopes, Acoustics, Wind measurement, Buildings, Turbulence, Interferometers, Solar radiation models, 3D imaging standards

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Proceedings Article | 9 June 1994 Paper

Interferometric mode of the European Southern Observatory Very Large Telescope

Oskar von der Luehe, Didier Ferrand, Bertrand Koehler, N. Zhu, Thorsten Reinheimer

Proceedings Volume 2200, (1994) https://doi.org/10.1117/12.177237

KEYWORDS: Telescopes, Space telescopes, Interferometry, Interferometers, Ultraviolet radiation, Astatine, Signal to noise ratio, Observatories, Adaptive optics, Mirrors

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Proceedings Article | 31 May 1994 Paper

Estimating residual aberrations from images taken at the user focus of a telescope compensated by adaptive optics

Oskar von der Luehe, Bertrand Theodore

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176018

KEYWORDS: Adaptive optics, Wavefronts, Point spread functions, Calibration, Telescopes, Astronomy, Control systems, Deformable mirrors, Monochromatic aberrations, Wavefront sensors

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Proceedings Article | 31 May 1994 Paper

Highly variable curvature mirrors for the Very Large Telescope Interferometer

Marc Ferrari, Gerard Lemaitre, Silvio Mazzanti, Oskar von der Luehe, Bernard di Biagio, Pierre Montiel, Daniel Revest, Patrice Joulie, Jean-Francois Carre

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176116

KEYWORDS: Mirrors, Adaptive optics, Zoom lenses, Astronomy, Interferometers, Large telescopes, Control systems, Active optics, X-rays, Eye

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Proceedings Article | 1 December 1991 Paper

Solar feature correlation tracker

Thomas Rimmele, Oskar von der Luehe, P. Wiborg, A. Lee Widener, Richard Dunn, G. Spence

Proceedings Volume 1542, (1991) https://doi.org/10.1117/12.48806

KEYWORDS: Sensors, Detection and tracking algorithms, Mirrors, Servomechanisms, Fourier transforms, Telescopes, Solar telescopes, Active optics, Observatories, Control systems

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