Dr. Thomas Ott Profile

Dr. Thomas Ott

at Max-Planck-Institut für extraterrestrische Physik

SPIE Involvement:

Author

Publications (38)

Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

GRAVITY+ Wide: towards hundreds of z ~ 2 AGN

Antonia Drescher, Maximilian Fabricius, Taro Shimizu, Julien Woillez, Pierre Bourget, Felix Widmann, Jinyi Shangguan, Christian Straubmeier, Matthew Horrobin, Nicolas Schuhler, Frank Eisenhauer, Frederic Gonté, Stefan Gillessen, Thomas Ott, Guy Perrin, Thibaut Paumard, Wolfgang Brandner, Laura Kreidberg, Karine Perraut, Jean-Baptiste Le Bouquin, Paulo Garcia, Sebastian Hönig, Denis Defrère, Guillaume Bourdarot, Helmut Feuchtgruber, Reinhard Genzel, Michael Hartl, Frank Haussmann, Dieter Lutz, Nikhil More, Christian Rau, Jonas Sauter, Sinem Uysal, Patrick Wessely, Ekkehard Wieprecht, Lukas Wimmer, Senol Yazici

Proceedings Volume 12183, 121830T (2022) https://doi.org/10.1117/12.2628921

KEYWORDS: Fourier transforms, Visibility, Mirrors, Stars, Atmospheric turbulence, Atmospheric modeling, Adaptive optics, Relays, Turbulence

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

GRAVITY faint: reducing noise sources in GRAVITY+ with a fast metrology attenuation system

Felix Widmann, Stefan Gillessen, Thomas Ott, Taro Shimizu, Frank Eisenhauer, Maximilian Fabricius, Julien Woillez, Frédéric Gonté, Matthew Horrobin, Jingyi Shangguan, Senol Yazici, Guy Perrin, Thibaut Paumard, Wolfgang Brandner, Laura Kreidberg, Christian Straubmeier, Karin Perraut, Jean-Baptiste Le Bouquin, Paulo Garcia, Sebastian Hönig, Denis Defrère, Guillaume Bourdarot, Antonia Drescher, Helmut Feuchtgruber, Reinhard Genzel, Michael Hartl, Dieter Lutz, Nikhil More, Christian Rau, Sinem Uysal, Ekkehard Wieprecht

Proceedings Volume 12183, 121830U (2022) https://doi.org/10.1117/12.2628813

KEYWORDS: Astronomical interferometers, Near infrared, Metrology, Laser metrology, Sensors, Signal to noise ratio, Backscatter, Telescopes, Fourier transforms, Stars, Diodes, Fiber couplers

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Proceedings Article | 15 January 2021 Poster + Paper

Poster + Paper

GRAVITY upgrade with high-performance grisms with factor >2 enhanced throughput

Senol Yazici, Takashi Sukegawa, Martin Mayer, Frank Eisenhauer, Yukinobu Okura, Karine Perraut, Laurent Jocou, Stefan Gillessen, Frank Haussmann, Alexander Buron, David Huber, Lothar Barl, Kateryna Kravchenko, Oliver Pfuhl, Sylvestre Lacour, Vincent Lapeyrere, Erich Wiezorrek, Thomas Ott, Thibaut Paumard, Jinyi Shangguan, Feng Gao, Christian Straubmeier, Patricia Guajardo, Miguel Riquelme, Laurent Pallanca, Reinhard Genzel, Tim de Zeeuw, Michael Bauböck, Maryam Habibi, Christian Rau, Alejandra Jimenez Rosales, Julia Stadler, Odele Straub, Eckhard Sturm, Sebastiano von Fellenberg, Felix Widmann, Ekkehard Wieprecht, Andreas Eckart, Guy Perrin, Antonio Amorim, Paolo Garcia, Wolfgang Brandner

Proceedings Volume 11446, 114461X (2021) https://doi.org/10.1117/12.2561387

KEYWORDS: Spectroscopy, Interferometry, Spectral resolution, Germanium, Phase interferometry, Image resolution, Zinc, Refractive index, Antireflective coatings, Optical properties

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Proceedings Article | 16 December 2020 Presentation + Paper

Presentation + Paper

The ExoGRAVITY project: using single mode interferometry to characterize exoplanets

S. Lacour, J. Wang, M. Nowak, L. Pueyo, F. Eisenhauer, A.-M. Lagrange, P. Mollière, R. Abuter, A. Amorin, R. Asensio-Torres, M. Bauböck, M. Benisty, J. P. Berger, H. Beust, S. Blunt, A. Boccaletti, A. Bohn, M. Bonnefoy, H. Bonnet, W. Brandner, F. Cantalloube, P. Caselli, B. Charnay, G. Chauvin, E. Choquet, V. Christiaens, Y. Clénet, A. Cridland, P. T. de Zeeuw, R. Dembet, J. Dexter, A. Drescher, G. Duvert, F. Gao, P. Garcia, R. Garcia Lopez, T. Gardner, E. Gendron, R. Genzel, S. Gillessen, J. H. Girard, X. Haubois, G. Heißel, T. Henning, S. Hinkley, S. Hippler, M. Horrobin, M. Houllé, Z. Hubert, A. Jiménez-Rosales, L. Jocou, J. Kammerer, M. Keppler, P. Kervella, L. Kreidberg, V. Lapeyrère, J.-B. Le Bouquin, P. Léna, D. Lutz, A.-L. Maire, A. Mérand, J. D. Monnier, D. Mouillet, A. Muller, E. Nasedkin, T. Ott, G. P. P. L. Otten, C. Paladini, T. Paumard, K. Perraut, G. Perrin, O. Pfuhl, J. Rameau, L. Rodet, G. Rodriguez-Coira, G. Rousset, J. Shangguan, T. Shimizu, J. Stadler, O. Straub, C. Straubmeier, E. Sturm, T. Stolker, E. van Dishoeck, A. Vigan, F. Vincent, S. D. von Fellenberg, K. Ward-Duong, F. Widmann, E. Wieprecht, E. Wiezorrek, J. Woillez

Proceedings Volume 11446, 114460O (2020) https://doi.org/10.1117/12.2561667

KEYWORDS: Interferometry, Exoplanets

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Proceedings Article | 14 December 2020 Poster + Paper

Poster + Paper

Dimensioning adaptive optics for future VLTI projects

Fabien Patru, Florentin Millour, Olivier Lai, Marcel Carbillet, Frank Eisenhauer, Stefan Gillessen, Maximilian Haase, Michael Hartl, Frank Haussmann, Jean-Baptiste Le Bouquin, Dieter Lutz, Christopher Mandla, Nikhil More, Thomas Ott, Thibaut Paumard, Christian Rau, Josef Schubert, Ekkehard Wieprecht, Julien Woillez, Senol Yazici

Proceedings Volume 11448, 1144871 (2020) https://doi.org/10.1117/12.2562433

KEYWORDS: Adaptive optics, Wavefront sensors, Numerical simulations

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Proceedings Article | 13 December 2020 Presentation

Presentation

Polarization analysis of GRAVITY and the VLTI

Felix Widmann, Frank Eisenhauer, Oliver Pfuhl, Nicolas Schuhler, Xavier Haubois, António Amorim, Michi Bauböck, Wolfgang Brandner, Jason Dexter, Feng Gao, Paulo J. Garcia, Reinhard Genzel, Stefan Gillessen, Alejandra Jimenez-Rosales, Sylvestre Lacour, Thomas Ott, Karine Perraut, Guy Perrin, Jinyi Shangguan, Odèle Straub, Christian Straubmeier, Eckhard Sturm, Sebastiano von Fellenberg

Proceedings Volume 11446, 114460S (2020) https://doi.org/10.1117/12.2559311

KEYWORDS: Polarization, Data modeling, Polarization analysis, Calibration, Signal attenuation, Birefringence, Polarimetry, Telescopes, Mirrors, Device simulation

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Proceedings Article | 13 December 2020 Presentation

Presentation

First four telescopes large-separation off-axis fringe-tracking interferometry with GRAVITY at the VLTI

Feng Gao, Frank Eisenhauer, Julien Woillez, Pierre Bourget, Bruno Chazelas, Roderick Dembet, Frédéric Gonté, Jürgen Ott, Nicolas Schuhler, Gérard Zins, Frank Haussmann, Michael Hartl, Stefan Gillessen, Reinhard Genzel, Guy Perrin, Wolfgang Brandner, Thibaut Paumard, Karine Perraut, Paulo J. Garcia, Christian Straubmeier, António Amorim, Thomas Ott, Felix Widmann, Jinyi Shangguan, Odèle Straub, Sebastiano von Fellenberg, Eckhard Sturm, Oliver Pfuhl, Michi Bauboeck, Alejandra Jimenez-Rosales, Matthew Horrobin, Julia Stadler, Dieter Lutz, Taro Shimizu, Antonia Drescher, Mari Lena Bolzer

Proceedings Volume 11446, 114461I (2020) https://doi.org/10.1117/12.2561408

KEYWORDS: Telescopes, Interferometry, Interferometers, Atmospheric turbulence, Optical interferometry, Large telescopes, Stars

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Proceedings Article | 13 December 2020 Presentation

Presentation

Static phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distanceStatic phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distance

Julia Stadler, Guy Perin, Wolfgang Brandner, Christian Straubmeier, Karine Rousselet-Perraut, António Amorim, Paulo Garcia, Frank Eisenhauer, Michael Bauböck, Feng Gao, Reinhard Genzel, Stefan Gillessen, Alejandra Jimenez-Rosales, Thomas Ott, Jinyi Shangguan, Odèle Straub, Eckhard Sturm, Sebastiano von Fellenberg, Felix Widmann, Oliver Pfuhl, Sylvestre Lacour, Julien Woillez, Mathias Nowak

Proceedings Volume 11446, 114460M (2020) https://doi.org/10.1117/12.2576225

KEYWORDS: Interferometry, Visibility, Phase measurement, Calibration, Zernike polynomials, Superposition, Phase interferometry, Integrated optics, Control systems

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Proceedings Article | 9 July 2018 Open Access

Open Access

Presentation + Paper

Learnings from the use of fiber optics in GRAVITY

Magdalena Lippa, Stefan Gillessen, Nicolas Blind, Yitping Kok, Karine Perraut, Laurent Jocou, Frank Eisenhauer, Oliver Pfuhl, Marcus Haug, Stefan Kellner, Frank Haußmann, Markus Plattner, Christian Rau, Oliver Hans, Ekkehard Wieprecht, Thomas Ott, Erich Wiezorrek, Eckhard Sturm, Alexander Buron, Sylvestre Lacour, Reinhard Genzel, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Antonio Amorim

Proceedings Volume 10701, 107011Y (2018) https://doi.org/10.1117/12.2312477

KEYWORDS: Metrology, Connectors, Polarization, Backscatter, Fiber lasers, Raman scattering, Laser metrology, Luminescence, Fiber optics, Glasses

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Proceedings Article | 9 July 2018 Open Access

Open Access

Paper

Improving GRAVITY towards observations of faint targets

Felix Widmann, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karin Perraut, Antonio Amorim, Markus Schöller, Feng Gao, Reinhard Genzel, Stefan Gillessen, Martina Karl, Sylvestre Lacour, Magdalena Lippa, Thomas Ott, Oliver Pfuhl, Philipp Plewa, Idel Waisberg

Proceedings Volume 10701, 107010K (2018) https://doi.org/10.1117/12.2312118

KEYWORDS: Signal to noise ratio, Calibration, Data modeling, Systems modeling, Telescopes, Atmospheric modeling, Interferometers, Interferometry

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Proceedings Article | 4 August 2016 Open Access

Open Access

Paper

The metrology system of the VLTI instrument GRAVITY

Magdalena Lippa, Stefan Gillessen, Nicolas Blind, Yitping Kok, Şenol Yazıcı, Johannes Weber, Oliver Pfuhl, Marcus Haug, Stefan Kellner, Ekkehard Wieprecht, Frank Eisenhauer, Reinhard Genzel, Oliver Hans, Frank Haußmann, David Huber, Tobias Kratschmann, Thomas Ott, Markus Plattner, Christian Rau, Eckhard Sturm, Idel Waisberg, Erich Wiezorrek, Guy Perrin, Karine Perraut, Wolfgang Brandner, Christian Straubmeier, Antonio Amorim

Proceedings Volume 9907, 990722 (2016) https://doi.org/10.1117/12.2232272

KEYWORDS: Metrology, Telescopes, Signal detection, Laser metrology, Sensors, Beam splitters, Phase shifts, Phase measurement, Receivers, Diodes

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Proceedings Article | 4 August 2016 Paper

Paper

GRAVITY acquisition camera: characterization results

Narsireddy Anugu, Paulo Garcia, Antonio Amorim, Erich Wiezorrek, Ekkehard Wieprecht, Frank Eisenhauer, Thomas Ott, Oliver Pfuhl, Paulo Gordo, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proceedings Volume 9907, 990727 (2016) https://doi.org/10.1117/12.2233315

KEYWORDS: Stars, Cameras, Telescopes, Optical tracking, Imaging systems, Sensors, Electroluminescent displays, Image sensors, Actuators, Mirrors

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Proceedings Article | 24 July 2014 Paper

Paper

The GRAVITY/VLTI acquisition camera software

Narsireddy Anugu, Paulo J. Garcia, Ekkehard Wieprecht, Antonio Amorim, Leonard Burtscher, Thomas Ott, Paulo Gordo, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proceedings Volume 9146, 91462C (2014) https://doi.org/10.1117/12.2055831

KEYWORDS: Imaging systems, Cameras, Telescopes, Sensors, Image sensors, Refraction, Stars, Wavefronts, Device simulation, Databases

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Proceedings Article | 24 July 2014 Open Access

Open Access

Paper

The GRAVITY metrology system: narrow-angle astrometry via phase-shifting interferometry

Magdalena Lippa, Nicolas Blind, Stefan Gillessen, Yitping Kok, Johannes Weber, Frank Eisenhauer, Oliver Pfuhl, Annemieke Janssen, Marcus Haug, Frank Haußmann, Stefan Kellner, Oliver Hans, Ekkehard Wieprecht, Thomas Ott, Leonard Burtscher, Reinhard Genzel, Eckhard Sturm, Reiner Hofmann, S. Huber, David Huber, Stefanie Senftleben, Andreas Pflüger, Roland Greßmann, Guy Perrin, Karine Perraut, Wolfgang Brandner, Christian Straubmeier, Antonio Amorim, Markus Schöller

Proceedings Volume 9146, 914622 (2014) https://doi.org/10.1117/12.2054637

KEYWORDS: Phase shifts, Metrology, Phase shift keying, Calibration, Telescopes, Modulation, Phase interferometry, Interferometers, Interferometry, Phase measurement

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Proceedings Article | 24 July 2014 Paper

Paper

The fiber coupler and beam stabilization system of the GRAVITY interferometer

O. Pfuhl, M. Haug, F. Eisenhauer, S. Kellner, F. Haussmann, G. Perrin, S. Gillessen, C. Straubmeier, T. Ott, K. Rousselet-Perraut, A. Amorim, Magdalena Lippa, A. Janssen, W. Brandner, Yitping Kok, N. Blind, L. Burtscher, E. Sturm, E. Wieprecht, M. Schoeller, J. Weber, O. Hans, S. Huber

Proceedings Volume 9146, 914623 (2014) https://doi.org/10.1117/12.2055080

KEYWORDS: Telescopes, Fiber couplers, Actuators, Mirrors, Prisms, Adaptive optics, Sensors, Cameras, Stars, Interferometers

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Proceedings Article | 24 July 2014 Open Access

Open Access

Paper

The GRAVITY instrument software/hardware related aspects

Thomas Ott, Ekkehard Wieprecht, Leonard Burtscher, Yitping Kok, Senol Yazici, Narsireddy Anugu, Roderick Dembet, Pierre Fedou, Sylvestre Lacour, Jürgen Ott, Frank Eisenhauer, Nicolas Blind, Reinhard Genzel, Stefan Gillessen, Oliver Hans, Marcus Haug, Frank Haussmann, Stefan Huber, Annemieke Janssen, Stefan Kellner, Magdalena Lippa, Oliver Pfuhl, Eckhard Sturm, Johannes Weber, Antonio Amorim, Wolfgang Brandner, Karine Rousselet-Perraut, Guy Perrin, Christian Straubmeier, Markus Schöller, Roberto Abuter

Proceedings Volume 9146, 91462A (2014) https://doi.org/10.1117/12.2055927

KEYWORDS: Sensors, Lamps, Camera shutters, Control systems, Analog electronics, Metrology, Detection and tracking algorithms, Optical fibers, Fiber lasers, Laser metrology

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Proceedings Article | 24 July 2014 Open Access

Open Access

Paper

The GRAVITY instrument software/high-level software

Leonard Burtscher, Ekkehard Wieprecht, Thomas Ott, Yitping Kok, Senol Yazici, Narsireddy Anugu, Roderick Dembet, Pierre Fedou, Sylvestre Lacour, Jürgen Ott, Thibaut Paumard, Vincent Lapeyrere, Pierre Kervella, Roberto Abuter, Eszter Pozna, Frank Eisenhauer, Nicolas Blind, Reinhard Genzel, Stefan Gillessen, Oliver Hans, Marcus Haug, Frank Haussmann, Stefan Kellner, Magdalena Lippa, Oliver Pfuhl, Eckhard Sturm, Johannes Weber, Antonio Amorim, Wolfgang Brandner, Karine Rousselet-Perraut, Guy Perrin, Christian Straubmeier, Markus Schöller

Proceedings Volume 9146, 91462B (2014) https://doi.org/10.1117/12.2055928

KEYWORDS: Sensors, Process control, Control systems, Cameras, Telescopes, Signal detection, Data acquisition, Computing systems, Interferometers, Interfaces

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Proceedings Article | 24 July 2014 Paper

Paper

GRAVITY: the calibration unit

N. Blind, F. Eisenhauer, M. Haug, S. Gillessen, Magdalena Lippa, L. Burtscher, O. Hans, F. Haussmann, S. Huber, A. Janssen, S. Kellner, Y. Kok, T. Ott, O. Pfuhl, E. Sturm, J. Weber, E. Wieprecht, A. Amorim, W. Brandner, G. Perrin, K. Perraut, C. Straubmeier

Proceedings Volume 9146, 91461U (2014) https://doi.org/10.1117/12.2055542

KEYWORDS: Calibration, Mirrors, Telescopes, Stars, Metrology, Wavefronts, Light sources, Relays, Optical alignment, Safety

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Proceedings Article | 24 July 2014 Paper

Paper

The GRAVITY metrology system: modeling a metrology in optical fibers

N. Blind, Heinrich Huber, F. Eisenhauer, J. Weber, S. Gillessen, M. Lippa, L. Burtscher, O. Hans, M. Haug, F. Haussmann, S. Huber, A. Janssen, S. Kellner, Y. Kok, T. Ott, O. Pfuhl, E. Sturm, E. Wieprecht, A. Amorim, W. Brandner, G. Perrin, K. Perraut, C. Straubmeier

Proceedings Volume 9146, 914624 (2014) https://doi.org/10.1117/12.2055553

KEYWORDS: Metrology, Phase modulation, Polarization, Waveguides, Polarizers, Cameras, Connectors, Temperature metrology, Birefringence, Laser metrology

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Proceedings Article | 24 July 2014 Open Access

Open Access

Paper

GRAVITY: the impact of non-common optical paths within the metrology system

Yitping Kok, Stefan Gillessen, Sylvestre Lacour, Frank Eisenhauer, Nicolas Blind, Johannes Weber, Magdalena Lippa, Oliver Pfuhl, Leonard Burtscher, Ekkehard Wieprecht, Thomas Ott, Marcus Haug, Stefan Kellner, Frank Haussmann, Eckhard Sturm, Annemieke Janssen, Reinhard Genzel, Guy Perrin, Karine Perraut, Christian Straubmeier, Wolfgang Brandner, Antonio Amorim, Oliver Hans

Proceedings Volume 9146, 914625 (2014) https://doi.org/10.1117/12.2055567

KEYWORDS: Metrology, Stars, Laser metrology, Interferometers, Telescopes, Information operations, Visibility, Sensors, Phase shifts, Time metrology

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Proceedings Article | 12 September 2012 Paper

Paper

GRAVITY: beam stabilization and light injection subsystems

O. Pfuhl, M. Haug, F. Eisenhauer, D. Penka, A. Amorim, S. Kellner, S. Gillessen, T. Ott, E. Wieprecht, E. Sturm, F. Haußmann, S. Huber, M. Lippa, L. Burtscher, K. Rousselet-Perraut, C. Straubmeier, G. Perrin, W. Brandner

Proceedings Volume 8445, 84451U (2012) https://doi.org/10.1117/12.925391

KEYWORDS: Fiber couplers, Mirrors, Cameras, Actuators, Telescopes, Sensors, Diodes, Prisms, Receivers, Stars

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Proceedings Article | 12 September 2012 Paper

Paper

GRAVITY: metrology

Stefan Gillessen, Magdalena Lippa, Frank Eisenhauer, Oliver Pfuhl, Marcus Haug, Stefan Kellner, Thomas Ott, Ekkehard Wieprecht, Eckhard Sturm, Frank Haußmann, Clemens Kister, David Moch, Markus Thiel

Proceedings Volume 8445, 84451O (2012) https://doi.org/10.1117/12.926813

KEYWORDS: Metrology, Telescopes, Optical fibers, Mirrors, Diodes, Phase shifts, Phase measurement, Interferometry, Space telescopes, Photodiodes

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Proceedings Article | 12 September 2012 Paper

Paper

The final design of the GRAVITY acquisition camera and associated VLTI beam monitoring strategy

Antonio Amorim, Jorge Lima, Narsireddy Anugu, Frank Eisenhauer, Alexander Graeter, Marcus Haug, Thomas Ott, Oliver Pfuhl, Markus Thiel, Ekkehard Wieprecht, Pedro Carvas, Paulo Garcia, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut

Proceedings Volume 8445, 844534 (2012) https://doi.org/10.1117/12.925993

KEYWORDS: Sensors, Cameras, Imaging systems, Telescopes, Lenses, Beam analyzers, Metrology, Semiconductor lasers, Mirrors, Image sensors

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Proceedings Article | 21 July 2010 Paper

Paper

KMOS data flow: reconstructing data cubes in one step

Richard Davies, Alex Agudo Berbel, Erich Wiezorrek, Thomas Ott, Natascha Förster-Schreiber

Proceedings Volume 7735, 77356V (2010) https://doi.org/10.1117/12.856380

KEYWORDS: Calibration, Sensors, Data processing, Spectral resolution, Lamps, Spectroscopy, Visualization, Stars, Atmospheric modeling, Astronomical imaging

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Proceedings Article | 4 July 2006 Paper

Paper

First light of the ESO laser guide star facility

D. Bonaccini Calia, E. Allaert, J. Alvarez, C. Araujo Hauck, G. Avila, E. Bendek, B. Buzzoni, M. Comin, M. Cullum, R. Davies, M. Dimmler, I. Guidolin, W. Hackenberg, S. Hippler, S. Kellner, A. van Kesteren, F. Koch, U. Neumann, T. Ott, D. Popovic, F. Pedichini, M. Quattri, J. Quentin, S. Rabien, A. Silber, M. Tapia

Proceedings Volume 6272, 627207 (2006) https://doi.org/10.1117/12.674484

KEYWORDS: Telescopes, Sodium, Laser guide stars, Adaptive optics, Fiber lasers, LIDAR, Scattering, Continuous wave operation, Laser scattering, Observatories

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Proceedings Article | 25 October 2004 Open Access

Open Access

Paper

Using adaptive optics to probe the dynamics and star formation in active galactic nuclei

Richard Davies, Linda Tacconi, Reinhard Genzel, Thomas Ott, Sebastian Rabien

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.568135

KEYWORDS: Stars, Point spread functions, Adaptive optics, K band, Galactic astronomy, Absorption, Carbon monoxide, Spatial resolution, Active galactic nuclei, Telescopes

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Proceedings Article | 25 October 2004 Paper

Paper

Test performance of the PARSEC laser system

Sebastian Rabien, Richard Davies, Thomas Ott, Jianlang Li, Roberto Abuter, Stefan Kellner, Udo Neumann

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.551572

KEYWORDS: Optical amplifiers, Laser systems engineering, Laser guide stars, Sodium, Mirrors, Continuous wave operation, Stars, Adaptive optics, High power lasers, Fabry–Perot interferometers

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Proceedings Article | 7 February 2003 Paper

Paper

The VLT laser guide star facility

Domenico Bonaccini, Eric Allaert, Constanza Araujo, Enzo Brunetto, Bernard Buzzoni, Mauro Comin, Martin Cullum, Richard Davies, Canio Dichirico, Philippe Dierickx, Martin Dimmler, Michel Duchateau, Carsten Egedal, Wolfgang Hackenberg, Stefan Hippler, Stefan Kellner, Arno van Kesteren, Franz Koch, Udo Neumann, Thomas Ott, Marco Quattri, Jutta Quentin, Sebastian Rabien, Roberto Tamai, Mario Tapia, Massimo Tarenghi

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.459277

KEYWORDS: Telescopes, Relays, Laser guide stars, Continuous wave operation, Adaptive optics, Dye lasers, Diagnostics, Laser safety, Safety, Electronics

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Proceedings Article | 7 February 2003 Paper

Paper

Design of PARSEC, the VLT laser

Sebastian Rabien, Richard Davies, Thomas Ott, J. Li, Stefan Hippler, Udo Neumann

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.457097

KEYWORDS: Optical amplifiers, Mirrors, Adaptive optics, Laser guide stars, Telescopes, Continuous wave operation, Polarization, Laser systems engineering, Laser stabilization, Dye lasers

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Proceedings Article | 7 February 2003 Paper

Paper

Operational issues for PARSEC, the VLT laser

Richard Davies, Thomas Ott, Jianlang Li, Sebastian Rabien, Udo Neumann, Stefan Hippler, Domenico Bonaccini, Wolfgang Hackenberg

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.459068

KEYWORDS: Mirrors, Optical amplifiers, Sodium, Laser guide stars, Telescopes, Cameras, Observatories, Absorption, Fabry–Perot interferometers, Control systems

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Proceedings Article | 4 February 2002 Paper

Paper

ESO VLT laser guide star facility

Domenico Bonaccini, Wolfgang Hackenberg, Martin Cullum, Enzo Brunetto, Thomas Ott, Marco Quattri, Eric Allaert, Martin Dimmler, Massimo Tarenghi, Arno van Kesteren, Canio Dichirico, Bernard Buzzoni, Peter Gray, Roberto Tamai, Mario Tapia

Proceedings Volume 4494, (2002) https://doi.org/10.1117/12.454802

KEYWORDS: Telescopes, Relays, Mirrors, Adaptive optics, Information operations, Laser guide stars, Lawrencium, Diagnostics, Laser safety, Safety

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Proceedings Article | 4 February 2002 Paper

Paper

PARSEC: the laser for the VLT

Sebastian Rabien, Richard Davies, Thomas Ott, Stefan Hippler, Ulrich Neumann

Proceedings Volume 4494, (2002) https://doi.org/10.1117/12.454807

KEYWORDS: Sodium, Stars, Telescopes, Laser guide stars, Optical amplifiers, Adaptive optics, Dye lasers, Mirrors, Continuous wave operation, Astronomy

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Proceedings Article | 7 July 2000 Paper

Paper

ALFA: three years of experience in adaptive optics with a laser guide star

Stefan Hippler, Markus Kasper, Markus Feldt, Robert Weiss, Douglas Looze, Luzma Montoya, Jesus Aceituno, Thomas Ott, Richard Davies

Proceedings Volume 4007, (2000) https://doi.org/10.1117/12.390397

KEYWORDS: Adaptive optics, Telescopes, Laser guide stars, Wavefront sensors, Stars, Astronomy, K band, Sensors, Diffraction, Cameras

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Proceedings Article | 7 July 2000 Paper

Paper

ALFA laser guide star: present status and future developments

Sebastian Rabien, Richard Davies, Thomas Ott, David Butler

Proceedings Volume 4007, (2000) https://doi.org/10.1117/12.390398

KEYWORDS: Laser guide stars, Telescopes, Adaptive optics, Stars, Laser systems engineering, Sodium, Mirrors, Laser applications, Dye lasers, Beam controllers

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Proceedings Article | 7 July 2000 Paper

Paper

Sodium layer monitoring at Calar Alto by LIDAR

David Butler, Richard Davies, Hayden Fews, R. Michael Redfern, Nancy Ageorges, Wolfgang Hackenberg, Ralf-Rainer Rohloff, Sebastian Rabien, Thomas Ott, Stefan Hippler

Proceedings Volume 4007, (2000) https://doi.org/10.1117/12.390318

KEYWORDS: Sodium, Telescopes, LIDAR, Avalanche photodetectors, Photons, Pulsed laser operation, Laser guide stars, Calibration, Adaptive optics, Sensors

Read Abstract +

Observations have shown the presence of sodium layer centroid height variations of a few hundred meters on timescales of tens of seconds. As quality laser guide star (LGS) plus adaptive optics (AO) assisted astronomy, especially on large (8m+) telescopes, will require optimal scheduling of observations and regular laser and wavefront sensor focusing at sites where sporadic sodium layers are frequent, an 'easy to use' sodium layer monitor is required. LIDAR offers a convenient means to achieve this. By pulsing the outgoing sodium laser and performing time-of-flight measurements on the returned photons we can acquire the altitude profile of the sodium layer. Unfortunately, conventional LIDAR requires the laser duty cycle to be very low, therefore large integration times are required. However, by using a cross-correlation technique the duty cycle can be increased to 50%, which gives far better performance. We present the details of this technique which involved amplitude modulation of the MPIA/MPE ALFA cw laser, as well as the following results of such LIDAR measurements performed in October 1999 at the 3.5 m telescope at Calar Alto Observatory in Spain. The altitude of the sodium layer at Calar Alto on 17th and 18th October 1999 was found to be at 90 +/- 3 km and there is evidence for sporadics on one of two nights with sporadic layer FWHM* varying from approximately 240 to 350 m. In addition, a noticeable layer FWHM change (excluding the sporadic layer) from approximately 13 to approximately 5 - 7 km was observed over the two nights. After flux and altitude calibration and correction of the projected altitude range, a very good agreement is found between sodium layer profiles derived from an auxiliary telescope and 3.5 m telescope LIDAR observations. Using an intensity weighted centroid algorithm the centroid height of the sodium layer was observed to have a variation of < 500 m in approximately 10 minutes. Although, shorter timescale variations may be have been present, poor observing conditions and resulting reduced S/N prevents this analysis.

Proceedings Article | 27 September 1999 Paper

Paper

Calar Alto ALFA and the sodium laser guide star in astronomy

David Butler, Richard Davies, Hayden Fews, Wolfgang Hackenberg, Sebastian Rabien, Thomas Ott, Andreas Eckart, Markus Kasper

Proceedings Volume 3762, (1999) https://doi.org/10.1117/12.363573

KEYWORDS: Sodium, Stars, Laser guide stars, Adaptive optics, Galactic astronomy, Telescopes, Astronomy, Mirrors, Sensors, Wavefronts

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Proceedings Article | 27 September 1999 Paper

Paper

Beam quality and polarization analysis of the ALFA laser at Calar Alto and the influence on brightness and size of the laser guide star

Sebastian Rabien, Richard Davies, Wolfgang Hackenberg, Andreas Eckart, Thomas Ott, David Butler

Proceedings Volume 3762, (1999) https://doi.org/10.1117/12.363594

KEYWORDS: Telescopes, Polarization, Sodium, Laser guide stars, Adaptive optics, Stars, Mirrors, Wavefronts, Distortion, Polarimetry

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Proceedings Article | 11 September 1998 Paper

Paper

ALFA: first operational experience of the MPE/MPIA laser guide star system for adaptive optics

Richard Davies, Wolfgang Hackenberg, Thomas Ott, Andreas Eckart, Hans-Christoph Holstenberg, Sebastian Rabien, Andreas Quirrenbach, Markus Kasper

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321747

KEYWORDS: Telescopes, Adaptive optics, Sodium, Stars, Laser guide stars, Wavefront sensors, Mirrors, Polarization, Laser systems engineering, Optical benches

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Showing 5 of 38 publications

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