Prof. Stefan Kraus Profile

Prof. Stefan Kraus

Professor at Univ of Exeter

SPIE Involvement:

Author

Publications (54)

SPIE Journal Paper | 27 June 2023

High-angular resolution and high contrast observations from Y to L band at the Very Large Telescope Interferometer with the Asgard Instrumental suite

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Azzurra Bigioli, Emilie Bouzerand, Julia Bryant, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Steve Ertel, Tyler Gardner, Germain Garreau, Adrian Glauser, Lucas Labadie, Tiphaine Lagadec, Romain Laugier, Alexandra Mazzoli, Daniel Mortimer, Barnaby R. Norris, Gert Raskin, Gordon Robertson, Ahmed Sanny, Adam Taras

JATIS, Vol. 9, Issue 02, 025007, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025007

KEYWORDS: Equipment, Stars, L band, Exoplanets, Astronomical interferometers, Nulling interferometry, Imaging systems, Spatial resolution, Planets, Planetary systems

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SPIE Journal Paper | 6 June 2023 Open Access

Open Access

MYSTIC: a high angular resolution K-band imager at CHARA

Benjamin Setterholm, John Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Jacob Ennis, Laurent Jocou, Nour Ibrahim, Stefan Kraus, Matthew Anderson, Sorabh Chhabra, Isabelle Codron, Christopher Farrington, Becky Flores, Tyler Gardner, Mayra Gutierrez, Cyprien Lanthermann, Olli W. Majoinen, Daniel Mortimer, Gail Schaefer, Nicholas Scott, Theo ten Brummelaar, Norman Vargas

JATIS, Vol. 9, Issue 02, 025006, (June 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025006

KEYWORDS: Equipment, K band, Spatial resolution, Beam combiners, Cameras, Imaging systems, Prisms, Mirrors, Vacuum, Design and modelling

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Proceedings Article | 29 August 2022 Presentation

Presentation

CHARA MIRC-X and MYSTIC cophasing observations to enable efficient spectro-interferometry and over-resolved object imaging

Narsireddy Anugu, John Monnier, Jean-Baptiste Le Bouquin, Stefan Kraus, Benjamin Setterholm, Theo ten Brummelaar, Gail Schaefer, Cyprien Lanthermann, Jacob Ennis

Proceedings Volume 12183, 121830J (2022) https://doi.org/10.1117/12.2629661

KEYWORDS: Telescopes, Spectral resolution, Spatial resolution, Ranging, Observatories, K band, Vibration control, Interferometry

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Proceedings Article | 29 August 2022 Presentation

Presentation

In memoriam Matt Willson

Antoine Mérand, Stefan Kraus, Fabien Baron

Proceedings Volume 12183, 121831Q (2022) https://doi.org/10.1117/12.2635454

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

High-angular and high-contrast VLTI observations from Y to M band with the Asgard instrumental suite

Marc-Antoine Martinod, Denis Defrère, Michael Ireland, Stefan Kraus, Frantz Martinache, Peter Tuthill, Azzurra Bigioli, Julia Bryant, Sorabh Chhabra, Benjamin Courtney-Barrer, Fred Crous, Nick Cvetojevic, Colin Dandumont, Germain Garreau, Tiphaine Lagadec, Romain Laugier, Daniel Mortimer, Barnaby Norris, Gordon Robertson, Adam Taras

Proceedings Volume 12183, 1218310 (2022) https://doi.org/10.1117/12.2628151

KEYWORDS: Sensors, Mirrors, Cameras, Lawrencium, Camera shutters, L band, Interferometers, Calibration, Spectral resolution, Spatial resolution

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

L-band nulling interferometry at the VLTI with Asgard/Hi-5: status and plans

Denis Defrère, Azzurra Bigioli, Colin Dandumont, Germain Garreau, Romain Laugier, Marc-Antoine Martinod, Olivier Absil, Jean-Philippe Berger, Emilie Bouzerand, Benjamin Courtney-Barrer, Alexandre Emsenhuber, Steve Ertel, Jonathan Gagne, Adrian Glauser, Simon Gross, Michael Ireland, Harry-Dean Kenchington, Jacques Kluska, Stefan Kraus, Lucas Labadie, Viktor Laborde, Alain Léger, Jarron Leisenring, Jérôme Loicq, Guillermo Martin, Johan Morren, Alexis Matter, Alexandra Mazzoli, Kwinten Missiaen, Salman Muhammad, Marc Ollivier, Gert Raskin, Hélène Rousseau, Ahmed Sanny, Simon Verlinden, Bart Vandenbussche, Julien Woillez

Proceedings Volume 12183, 121830H (2022) https://doi.org/10.1117/12.2627953

KEYWORDS: Stars, Planets, Exoplanets, Nulling interferometry, L band, Telescopes, Interferometers, Astronomy, Spectral resolution, Interferometry

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

High spectral-resolution interferometry down to one micron with Asgard/BIFROST at VLTI: science drivers and project overview

Stefan Kraus, Daniel Mortimer, Sorabh Chhabra, Yi Lu, Isabelle Codron, Tyler Gardner, Narsireddy Anugu, John Monnier, Jean-Baptiste Le Bouquin, Michael Ireland, Frantz Martinache, Denis Defrère, Marc-Antoine Martinod

Proceedings Volume 12183, 121831S (2022) https://doi.org/10.1117/12.2627973

KEYWORDS: Stars, Spectral resolution, Interferometry, Exoplanets, Astronomical interferometry, Infrared detectors, Astronomical spectroscopy

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

A thesis to probe unique exoplanet regimes with micro-arcsecond astrometry and precision closure phases at CHARA and VLTI

Tyler Gardner, John Monnier, Francis Fekel, Jean-Baptiste Le Bouquin, Adam Scovera, Gail Schaefer, Stefan Kraus, Fred Adams, Narsireddy Anugu, Hayley Beltz, Jean-Philippe Berger, Theo ten Brummelaar, Claire Davies, Jacob Ennis, Douglas Gies, Keith J. C. Johnson, Pierre Kervella, Kaitlin Kratter, Aaron Labdon, Cyprien Lanthermann, Isaac Malsky, Emily Rauscher, Johannes Sahlmann, Benjamin Setterholm

Proceedings Volume 12183, 121830Z (2022) https://doi.org/10.1117/12.2630035

KEYWORDS: Planets, Stars, Calibration, Exoplanets, Data modeling, Interferometry, Binary data

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Beam combiner for the Asgard/BIFROST instrument

Daniel Mortimer, Sorabh Chhabra, Stefan Kraus, Narsireddy Anugu, Romain Laugier, Jean-Baptiste Le Bouquin, John Monnier

Proceedings Volume 12183, 121831U (2022) https://doi.org/10.1117/12.2629268

KEYWORDS: Signal to noise ratio, Single mode fibers, Visibility, Photons, Spatial frequencies, Spectral resolution

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

MYSTIC: a high angular resolution K-band imager at CHARA

Benjamin Setterholm, John Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Jacob Ennis, Becky Flores, Tyler Gardner, Nour Ibrahim, Laurent Jocou, Stefan Kraus, Cyprien Lanthermann, Gail Schaefer, Theo ten Brummelaar

Proceedings Volume 12183, 121830B (2022) https://doi.org/10.1117/12.2629437

KEYWORDS: Astronomical interferometry, Long baseline optical interferometry, Optical fibers, K band, Cameras, Prisms, Spatial resolution, Visibility, Optical systems, Optical filters

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Spectrograph design for the Asgard/BIFROST spectro-interferometric instrument for the VLTI

Sorabh Chhabra, Michele Frangiamore, Stefan Kraus, Andrea Bianco, Francisco Garzon, John Monnier, Daniel Mortimer

Proceedings Volume 12183, 121830M (2022) https://doi.org/10.1117/12.2628805

KEYWORDS: Spectrographs, Binary data, Diffraction gratings, Calibration, Sensors, Prisms, Spectral resolution, Diffraction, Reflectivity

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Proceedings Article | 13 December 2020 Paper

Paper

Review and scientific prospects of high-contrast optical stellar interferometry

D. Defrère, O. Absil, J.-P. Berger, W. C. Danchi, C. Dandumont, F. Eisenhauer, S. Ertel, T. Gardner, A. Glauser, P. Hinz, M. Ireland, J. Kammerer, S. Kraus, L. Labadie, S. Lacour, R. Laugier, J. Loicq, G. Martin, F. Martinache, M. A. Martinod, B. Mennesson, J. Monnier, B. Norris, M. Nowak, J. U. Pott, S. Quanz, E. Serabyn, J. Stone, P. Tuthill, J. Woillez

Proceedings Volume 11446, 114461J (2020) https://doi.org/10.1117/12.2561505

KEYWORDS: Stellar interferometry, Interferometry, Nulling interferometry, Data acquisition, Stars, Adaptive optics, Integrated optics, Calibration, Large telescopes

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

CHARA/MIRC-X: a high-sensitive six telescope interferometric imager concept, commissioning and early science

Narsireddy Anugu, Jean-Baptiste Le Bouquin, John Monnier, Stefan Kraus, Gail Schaefer, Benjamin Setterholm, Claire Davies, Tyler Gardner, Aaron Labdon, Cyprien Lanthermann, Jacob Ennis, Theo ten Brummelaar, Judit Sturmann, Matt Anderson, Chris Farrington, Norm Vargas, Olli Majoinen

Proceedings Volume 11446, 114460N (2020) https://doi.org/10.1117/12.2561579

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

MIRC-X polarinterferometry at CHARA

Benjamin Setterholm, John Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Aaron Labdon, Jacob Ennis, Keith J. Johnson, Stefan Kraus, Theo ten Brummelaar

Proceedings Volume 11446, 114460R (2020) https://doi.org/10.1117/12.2562407

KEYWORDS: Prisms, Stars, Spectral resolution, Polarimetry, Sensors, Light scattering, Beryllium

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

A new frontier for J-band interferometry: dual-band NIR interferometry with MIRC-X

Aaron Labdon, John Monnier, Stefan Kraus, Jean-Baptiste Le Bouquin, Benjamin Setterholm, Narsireddy Anugu, Theo ten Brummelaar, Cyprien Lanthermann, Claire Davies, Jacob Ennis, Tyler Gardner, Gail Schaefer, Laszlo Sturmann, Judit Sturmann

Proceedings Volume 11446, 114460H (2020) https://doi.org/10.1117/12.2561371

KEYWORDS: Interferometry, Near infrared, Birefringence, Atmospheric corrections, Atmospheric modeling, Telescopes, Instrument modeling

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Proceedings Article | 13 December 2020 Paper

Paper

CHARA array adaptive optics: complex operational software and performance

Narsireddy Anugu, Theo ten Brummelaar, Nils Turner, Matthew Anderson, Jean-Baptiste Le Bouquin, Judit Sturmann, Laszlo Sturmann, Chris Farrington, Norm Vargas, Olli Majoinen, Michael Ireland, John Monnier, Denis Mourard, Gail Schaefer, Douglas Gies, Stephen Ridgway, Stefan Kraus, Cyril Petit, Michel Tallon, Caroline Lim, Philippe Berio

Proceedings Volume 11446, 1144622 (2020) https://doi.org/10.1117/12.2561560

KEYWORDS: Adaptive optics, Telescopes, Wavefront sensors, Optical arrays, Cameras, Deformable mirrors, Actuators, Space telescopes, Interferometers, Binary data

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Proceedings Article | 13 December 2020 Poster

Poster

High-spectral resolution interferometry at 1 micrometer with VLTI/BIFROST: science drivers and instrument design

Stefan Kraus, Michael Ireland, Jean-Baptiste Le Bouquin, John Monnier, Barnaby Norris, Frantz Martinache, Denis Defrère, Narsireddy Anugu

Proceedings Volume 11446, 114462H (2020) https://doi.org/10.1117/12.2562181

KEYWORDS: Spectral resolution, Interferometry, Stars, Exoplanets, Planetary systems, Diagnostics, Telescopes, Spectroscopes, James Webb Space Telescope, Adaptive optics

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Progress of the CHARA/SPICA project

C. Pannetier, D. Mourard, P. Berio, F. Cassaing, F. Allouche, N. Anugu, C. Bailet, T. ten Brummelaar, J. Dejonghe, D. Gies, L. Jocou, S. Kraus, S. Lacour, S. Lagarde, J. B. Le Bouquin, D. Lecron, J. Monnier, N. Nardetto, F. Patru, K. Perraut, R. Petrov, S. Rousseau, P. Stee, J. Sturmann, L. Sturmann

Proceedings Volume 11446, 114460T (2020) https://doi.org/10.1117/12.2560625

KEYWORDS: Glasses, Stars, Fourier transforms, Optical tracking, Photons, Integrated optics, Coherence (optics), Atmospheric optics, Planets, Interferometry

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

VLTI images of circumbinary disks around evolved stars

Jacques Kluska, Rik Claes, Akke Corporaal, Hans Van Winckel, Javier Alcolea, Narsireddy Anugu, Jean-Philippe Berger, Dylan Bollen, Valentin Bujarrabal, Robert Izzard, Devika Kamath, Stefan Kraus, Jean-Baptiste Le Bouquin, Michiel Min, John Monnier, Hans Olofsson

Proceedings Volume 11446, 114460D (2020) https://doi.org/10.1117/12.2561480

KEYWORDS: Stars, Image processing, Interferometry, Image restoration, Infrared imaging, Infrared radiation, Imaging systems, Spatial resolution, Thermal modeling, Binary data

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Proceedings Article | 21 August 2020 Paper

Paper

Betelgeuse scope: single-mode-fibers-assisted optical interferometer design for dedicated stellar activity monitoring

Narsireddy Anugu, Katie Morzinski, Josh Eisner, Ewan Douglas, Dan Marrone, Steve Ertel, Sebastiaan Haffert, Oscar Montoya, Jordan Stone, Stefan Kraus, John Monnier, Jean-Baptiste Lebouquin, Jean-Philippe Berger, Julien Woillez, Miguel Montargès

Proceedings Volume 11490, 114900X (2020) https://doi.org/10.1117/12.2568900

KEYWORDS: Telescopes, Convection, Stars, Interferometers, Visibility, Interferometry, Optical telescopes, Single mode fibers, Spatial resolution

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Proceedings Article | 16 July 2018 Presentation + Paper

Presentation + Paper

Astronomical interferometry with near-IR e-APD at CHARA: characterization, optimization and on-sky operation

Cyprien Lanthermann, Jean-Baptiste Le Bouquin, Narsireddy Anugu, John Monnier, Stefan Kraus

Proceedings Volume 10709, 1070914 (2018) https://doi.org/10.1117/12.2312944

KEYWORDS: Stellar interferometry, Near infrared, Cameras, Data modeling, Signal to noise ratio, Sensors, Calibration, Nondestructive evaluation, Astronomy

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Proceedings Article | 9 July 2018 Paper

Paper

MYSTIC: Michigan Young STar Imager at CHARA

John Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Stefan Kraus, Benjamin Setterholm, Jacob Ennis, Cyprien Lanthermann, Laurent Jocou, Theo ten Brummelaar

Proceedings Volume 10701, 1070122 (2018) https://doi.org/10.1117/12.2312762

KEYWORDS: Optical fibers, Cameras, Spectrographs, K band, Integrated optics, Stars, Imaging systems, Spectral resolution, Optical interferometry, Coherent beam combination

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

MIRC-X/CHARA: sensitivity improvements with an ultra-low noise SAPHIRA detector

Narsireddy Anugu, Jean-Baptiste Le Bouquin, John Monnier, Stefan Kraus, Jacob Ennis, Cyprien Lanthermann, Benjamin Setterholm, Claire Davies, Theo ten Brummelaar, Mariam Haidar, Veronika Dubravec, Scott Peters

Proceedings Volume 10701, 1070124 (2018) https://doi.org/10.1117/12.2313036

KEYWORDS: Cameras, Signal to noise ratio, Sensors, Data acquisition, Polarization, Optical fibers, Visibility, Imaging systems, Photons, Telescopes

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Proceedings Article | 9 July 2018 Paper

Paper

Hi-5: a potential high-contrast thermal near-infrared imager for the VLTI

D. Defrère, M. Ireland, O. Absil, J.-P. Berger, W. Danchi, S. Ertel, A. Gallenne, F. Hénault, P. Hinz, E. Huby, S. Kraus, L. Labadie, J.-B. Le Bouquin, G. Martin, A. Matter, B. Mennesson, A. Mérand, S. Minardi, J. Monnier, B. Norris, G. Orban de Xivry, E. Pedretti, J.-U. Pott, M. Reggiani, E. Serabyn, J. Surdej, K. R. W. Tristram, J. Woillez

Proceedings Volume 10701, 107010U (2018) https://doi.org/10.1117/12.2313700

KEYWORDS: Planets, Interferometry, Stars, Exoplanets, Imaging systems, Interferometers, L band, Mid-IR, Integrated optics, Astrophysics

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

The MIRC-X 6-telescope imager: key science drivers, instrument design and operation

Stefan Kraus, John Monnier, Narsireddy Anugu, Jean-Baptiste Le Bouquin, Claire Davies, Jacob Ennis, Aaron Labdon, Cyprien Lanthermann, Benjamin Setterholm, Theo ten Brummelaar

Proceedings Volume 10701, 1070123 (2018) https://doi.org/10.1117/12.2311706

KEYWORDS: Sensors, Cameras, Visibility, Stars, Imaging systems, Polarization, Interferometry, Optical fibers, Signal to noise ratio, Calibration

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Proceedings Article | 9 July 2018 Paper

Paper

Planet formation imager: project update

John Monnier, Michael Ireland, Stefan Kraus, Almudena Alonso-Herrero, Amy Bonsor, Fabien Baron, Amelia Bayo, Jean-Philippe Berger, Tabetha Boyajian, Andrea Chiavassa, David Ciardi, Michelle Creech-Eakman, Willem-Jan de Wit, Denis Defrère, Ruobing Dong, Gaspard Duchêne, Catherine Espaillat, Alexandre Gallenne, Poshak Gandhi, Jean-Francois Gonzalez, Chris Haniff, Sebastian Hoenig, John Ilee, Andrea Isella, Eric Jensen, Attila Juhasz, Stephen Kane, Makoto Kishimoto, Wilhelm Kley, Quentin Kral, Kaitlin Kratter, Lucas Labadie, Sylvestre Lacour, Greg Laughlin, Jean-Baptiste Le Bouquin, Ernest Michael, Farzana Meru, Rafael Millan-Gabet, Florentin Millour, Stefano Minardi, Alessandro Morbidelli, Chris Mordasini, Andreas Morlok, Dave Mozurkewich, Richard Nelson, Johan Olofsson, Rene Oudmaijer, Chris Packham, Claudia Paladini, Olja Panic, Romain Petrov, Benjamin Pope, Joerg-Uwe Pott, Luis Henry Quiroga-Nunez, Cristina Ramos Almeida, Sean Raymond, Zsolt Regaly, Mark Reynolds, Stephen Ridgway, Stephen Rinehart, Matthias Schreiber, Michael Smith, Keivan Stassun, Jean Surdej, Theo ten Brummelaar, Konrad Tristram, Neal Turner, Peter Tuthill, Gerard van Belle, Gautum Vasisht, Alexander Wallace, Gerd Weigelt, Edward Wishnow, Markus Wittkowski, Sebastian Wolf, John Young, Ming Zhao, Zhaohuan Zhu, Sebastian Zúñiga-Fernández

Proceedings Volume 10701, 1070118 (2018) https://doi.org/10.1117/12.2312683

KEYWORDS: Planets, Telescopes, Space telescopes, Exoplanets, Stars, Mid-IR, Interferometry, Signal to noise ratio, Interferometers, Heterodyning

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Proceedings Article | 6 July 2018 Paper

Paper

NPF: mirror development in Chile

Sebastián Zúñiga-Fernández, Amelia Bayo, Johan Olofsson, Leslie Pedrero, Claudio Lobos, Elias Rozas, Nicolás Soto, Matthias Schreiber, Pedro Escárate, Christian Romero, Hayk Hakobyan, Jorge Cuadra, Cristopher Rozas, John Monnier, Stefan Kraus, Mike Ireland, Pedro Mardones

Proceedings Volume 10700, 107003X (2018) https://doi.org/10.1117/12.2313983

KEYWORDS: Mirrors, Surface finishing, Carbon, Polishing, Abrasives, Manufacturing, Telescopes, Astronomy, Planets, Prototyping

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Proceedings Article | 4 August 2016 Paper

Paper

Architecture design study and technology road map for the Planet Formation Imager (PFI)

John Monnier, Michael Ireland, Stefan Kraus, Fabien Baron, Michelle Creech-Eakman, Ruobing Dong, Andrea Isella, Antoine Merand, Ernest Michael, Stefano Minardi, David Mozurkewich, Romain Petrov, Stephen Rinehart, Theo ten Brummelaar, Gautam Vasisht, Ed Wishnow, John Young, Zhaohuan Zhu

Proceedings Volume 9907, 99071O (2016) https://doi.org/10.1117/12.2233311

KEYWORDS: Telescopes, Planets, Imaging systems, Mid-IR, Heterodyning, Stars, Signal to noise ratio, Image restoration, L band, Visibility

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The Planet Formation Imager (PFI) Project has formed a Technical Working Group (TWG) to explore possible facility architectures to meet the primary PFI science goal of imaging planet formation in situ in nearby starforming regions. The goals of being sensitive to dust emission on solar system scales and resolving the Hill-sphere around forming giant planets can best be accomplished through sub-milliarcsecond imaging in the thermal infrared. Exploiting the 8-13 micron atmospheric window, a ground-based long-baseline interferometer with approximately 20 apertures including 10km baselines will have the necessary resolution to image structure down 0.1 milliarcseconds (0.014 AU) for T Tauri disks in Taurus. Even with large telescopes, this array will not have the sensitivity to directly track fringes in the mid-infrared for our prime targets and a fringe tracking system will be necessary in the near-infrared. While a heterodyne architecture using modern mid-IR laser comb technology remains a competitive option (especially for the intriguing 24 and 40μm atmospheric windows), the prioritization of 3-5μm observations of CO/H2O vibrotational levels by the PFI-Science Working Group (SWG) pushes the TWG to require vacuum pipe beam transport with potentially cooled optics. We present here a preliminary study of simulated L- and N-band PFI observations of a realistic 4-planet disk simulation, finding 21x2.5m PFI can easily detect the accreting protoplanets in both L and N-band but can see non-accreting planets only in L band. We also find that even an ambitious PFI will lack sufficient surface brightness sensitivity to image details of the fainter emission from dust structures beyond 5 AU, unless directly illuminated or heated by local energy sources. That said, the utility of PFI at N-band is highly dependent on the stage of planet formation in the disk and we require additional systematic studies in conjunction with the PFI-SWG to better understand the science capabilities of PFI, including the potential to resolve protoplanetary disks in emission lines to measure planet masses using position-velocity diagrams. We advocate for a specific technology road map in order to reduce the current cost driver (telescopes) and to validate high accuracy fringe tracking and high dynamic range imaging at L, M band. In conclusion, no technology show-stoppers have been identified for PFI to date, however there is high potential for breakthroughs in medium-aperture (4-m class) telescopes architecture that could reduce the cost of PFI by a factor of 2 or more.

Proceedings Article | 4 August 2016 Paper

Paper

Planet Formation Imager (PFI): science vision and key requirements

Stefan Kraus, John Monnier, Michael Ireland, Gaspard Duchêne, Catherine Espaillat, Sebastian Hönig, Attila Juhasz, Chris Mordasini, Johan Olofsson, Claudia Paladini, Keivan Stassun, Neal Turner, Gautam Vasisht, Tim Harries, Matthew Bate, Jean-François Gonzalez, Alexis Matter, Zhaohuan Zhu, Olja Panic, Zsolt Regaly, Alessandro Morbidelli, Farzana Meru, Sebastian Wolf, John Ilee, Jean-Philippe Berger, Ming Zhao, Quentin Kral, Andreas Morlok, Amy Bonsor, David Ciardi, Stephen Kane, Kaitlin Kratter, Greg Laughlin, Joshua Pepper, Sean Raymond, Lucas Labadie, Richard Nelson, Gerd Weigelt, Theo ten Brummelaar, Arnaud Pierens, Rene Oudmaijer, Wilhelm Kley, Benjamin Pope, Eric L. Jensen, Amelia Bayo, Michael Smith, Tabetha Boyajian, Luis Henry Quiroga-Nuñez, Rafael Millan-Gabet, Andrea Chiavassa, Alexandre Gallenne, Mark Reynolds, Willem-Jan de Wit, Markus Wittkowski, Florentin Millour, Poshak Gandhi, Cristina Ramos Almeida, Almudena Alonso Herrero, Chris Packham, Makoto Kishimoto, Konrad R. Tristram, Jörg-Uwe Pott, Jean Surdej, David Buscher, Chris Haniff, Sylvestre Lacour, Romain Petrov, Steve Ridgway, Peter Tuthill, Gerard van Belle, Phil Armitage, Clement Baruteau, Myriam Benisty, Bertram Bitsch, Sijme-Jan Paardekooper, Christophe Pinte, Frederic Masset, Giovanni Rosotti

Proceedings Volume 9907, 99071K (2016) https://doi.org/10.1117/12.2231067

KEYWORDS: Planets, Imaging systems, Exoplanets, Planetary systems, Astrophysics, Stars, Astronomy, Theoretical astronomy, Observatories, Physics

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Proceedings Article | 4 August 2016 Paper

Paper

Co-phasing the planet formation imager

Romain Petrov, Abdelkarim Boskri, Thami Elhalkouj, John Monnier, Michael Ireland, Stefan Kraus

Proceedings Volume 9907, 99073W (2016) https://doi.org/10.1117/12.2231081

KEYWORDS: Planets, Imaging systems, Interferometers, Fourier transforms, Telescopes, Sensors, Phase measurement, Near infrared, Visibility, K band

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Proceedings Article | 4 August 2016 Paper

Paper

Status of the Planet Formation Imager (PFI) concept

Michael Ireland, John Monnier, Stefan Kraus, Andrea Isella, Stefano Minardi, Romain Petrov, Theo ten Brummelaar, John Young, Gautam Vasisht, David Mozurkewich, Stephen Rinehart, Ernest Michael, Gerard van Belle, Julien Woillez

Proceedings Volume 9907, 99071L (2016) https://doi.org/10.1117/12.2233926

KEYWORDS: Planets, Imaging systems, Telescopes, Signal to noise ratio, Heterodyning, Optical instrument design, Space telescopes, Stars, Optical spheres, Adaptive optics

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Proceedings Article | 24 July 2014 Paper

Paper

The science case for the Planet Formation Imager (PFI)

Stefan Kraus, John Monnier, Tim Harries, Ruobing Dong, Matthew Bate, Barbara Whitney, Zhaohuan Zhu, David Buscher, Jean-Philippe Berger, Chris Haniff, Mike Ireland, Lucas Labadie, Sylvestre Lacour, Romain Petrov, Steve Ridgway, Jean Surdej, Theo ten Brummelaar, Peter Tuthill, Gerard van Belle

Proceedings Volume 9146, 914611 (2014) https://doi.org/10.1117/12.2055544

KEYWORDS: Planets, Stars, Planetary systems, Mid-IR, Interferometry, Exoplanets, Computer simulations, Imaging systems, Radiative transfer, Physics

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Proceedings Article | 24 July 2014 Paper

Paper

Planet formation imager (PFI): introduction and technical considerations

John Monnier, Stefan Kraus, David Buscher, J.-P. Berger, Christopher Haniff, Michael Ireland, Lucas Labadie, Sylvestre Lacour, Herve Le Coroller, Romain Petrov, Jörg-Uwe Pott, Stephen Ridgway, Jean Surdej, Theo ten Brummelaar, Peter Tuthill, Gerard van Belle

Proceedings Volume 9146, 914610 (2014) https://doi.org/10.1117/12.2057262

KEYWORDS: Planets, Telescopes, Space telescopes, Stars, Imaging systems, Spatial resolution, Interferometry, Mid-IR, Interferometers, Exoplanets

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Proceedings Article | 24 July 2014 Paper

Paper

The 2014 interferometric imaging beauty contest

John Monnier, Jean-Philippe Berger, Jean-Baptiste Le Bouquin, Peter Tuthill, Markus Wittkowski, Rebekka Grellmann, André Müller, Sridhar Renganswany, Christian Hummel, Karl-Heinz Hofmann, Dieter Schertl, Gerd Weigelt, John Young, David Buscher, Joel Sanchez-Bermudez, Antxon Alberdi, Rainer Schoedel, Rainer Köhler, Ferréol Soulez, Éric Thiébaut, Jacques Kluska, Fabien Malbet, Gilles Duvert, Stefan Kraus, Brian Kloppenborg, Fabien Baron, Willem-Jan de Wit, Thomas Rivinius, Antoine Merand

Proceedings Volume 9146, 91461Q (2014) https://doi.org/10.1117/12.2057312

KEYWORDS: Stars, Image restoration, Interferometry, Image processing, Visibility, Reconstruction algorithms, Telescopes, Data modeling, Spatial resolution, Optical interferometry

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Proceedings Article | 12 September 2012 Paper

Paper

Imaging from the first 6-beam infrared combiner

Xiao Che, John Monnier, Stefan Kraus, Fabien Baron, Ettore Pedretti, Nathalie Thureau, Scott Webster

Proceedings Volume 8445, 84450Z (2012) https://doi.org/10.1117/12.926909

KEYWORDS: Visibility, Calibration, Binary data, Data modeling, Infrared radiation, Telescopes, Infrared imaging, Interferometry, Stars, Sensors

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Proceedings Article | 12 September 2012 Paper

Paper

Control interface concepts for CHARA 6-telescope fringe tracking with CHAMP+MIRC

Stefan Kraus, John Monnier, Fabien Baron, Xiao Che, Rafael Millan-Gabet, Nathalie Thureau, Ettore Pedretti

Proceedings Volume 8445, 84453A (2012) https://doi.org/10.1117/12.926559

KEYWORDS: Human-machine interfaces, Telescopes, Infrared telescopes, Infrared radiation, Amplifiers, Sensors, Electroluminescence, Interferometry, Fourier transforms, Infrared imaging

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Proceedings Article | 12 September 2012 Paper

Paper

Tracking faint fringes with the CHARA-Michigan Phasetracker (CHAMP)

John Monnier, F. Baron, M. Anderson, S. Kraus, R. Millan-Gabet, E. Pedretti, X. Che, T. ten Brummelaar, N. Calvet

Proceedings Volume 8445, 84451I (2012) https://doi.org/10.1117/12.926399

KEYWORDS: Ferroelectric materials, Coating, Visibility, Metrology, Signal to noise ratio, K band, Calibration, Astronomy, Interferometry, Infrared radiation

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Proceedings Article | 12 September 2012 Paper

Paper

New opportunities with spectro-interferometry and spectro-astrometry

Stefan Kraus

Proceedings Volume 8445, 84451H (2012) https://doi.org/10.1117/12.926801

KEYWORDS: Stars, Visibility, Calibration, Bromine, Data modeling, Beryllium, Interferometry, Double positive medium, Spatial resolution, Kinematics

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Proceedings Article | 22 July 2010 Paper

Paper

MI-6: Michigan interferometry with six telescopes

John Monnier, M. Anderson, F. Baron, D. Berger, X. Che, T. Eckhause, S. Kraus, E. Pedretti, N. Thureau, R. Millan-Gabet, T. ten Brummelaar, P. Irwin, M. Zhao

Proceedings Volume 7734, 77340G (2010) https://doi.org/10.1117/12.858286

KEYWORDS: Telescopes, Calibration, Stars, Amplifiers, Interferometry, Visibility, Imaging systems, Infrared telescopes, Infrared imaging, Infrared radiation

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Proceedings Article | 22 July 2010 Paper

Paper

First results from VLTI near-infrared interferometry on high-mass young stellar objects

Stefan Kraus, Karl-Heinz Hofmann, Karl Menten, Dieter Schertl, Gerd Weigelt, Friedrich Wyrowski, Anthony Meilland, Karine Perraut, Romain Petrov, Sylvie Robbe-Dubois, Peter Schilke, Leonardo Testi

Proceedings Volume 7734, 773408 (2010) https://doi.org/10.1117/12.858285

KEYWORDS: Stars, Interferometry, Data modeling, Visibility, Infrared radiation, Telescopes, Infrared technology, Synthetic apertures, Spatial resolution, K band

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Proceedings Article | 28 July 2008 Paper

Paper

AMBER closure and differential phases: accuracy and calibration with a beam commutation

Florentin Millour, Romain Petrov, Martin Vannier, Stefan Kraus

Proceedings Volume 7013, 70131G (2008) https://doi.org/10.1117/12.788689

KEYWORDS: Calibration, Phase shift keying, Colorimetry, Stars, Phase measurement, Modulation, Visibility, Astatine, Sensors, Data processing

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Proceedings Article | 28 July 2008 Paper

Paper

Infrared spectro-interferometry of YSOs

Stefan Kraus, Karl-Heinz Hofmann, Keiichi Ohnaka, Thomas Preibisch, Gerd Weigelt

Proceedings Volume 7013, 70130R (2008) https://doi.org/10.1117/12.789219

KEYWORDS: Stars, Visibility, Interferometry, Infrared radiation, Calibration, Near infrared, Infrared spectroscopy, Beryllium, Bromine, Binary data

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Proceedings Article | 28 July 2008 Paper

Paper

MATISSE: concept analysis

S. Lagarde, B. Lopez, R. G. Petrov, K. H. Hofmann, S. Kraus, W. Jaffe, P. Antonelli, Y. Bresson, Ch. Leinert, A. Matter

Proceedings Volume 7013, 701332 (2008) https://doi.org/10.1117/12.789391

KEYWORDS: Signal to noise ratio, Mid-IR, Interferometry, Sensors, Telescopes, Bismuth, Photometry, Contamination, Spectroscopy, Interferometers

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Proceedings Article | 28 July 2008 Paper

Paper

MATISSE: perspective of imaging in the mid-infrared at the VLTI

B. Lopez, P. Antonelli, S. Wolf, S. Lagarde, W. Jaffe, R. Navarro, U. Graser, R. Petrov, G. Weigelt, Y. Bresson, K. Hofmann, U. Beckman, T. Henning, W. Laun, Ch. Leinert, S. Kraus, S. Robbe-Dubois, F. Vakili, A. Richichi, P. Abraham, J.-C. Augereau, J. Behrend, Ph. Berio, N. Berruyer, O. Chesneau, J. Clausse, C. Connot, K. Demyk, W. Danchi, M. Dugué, G. Finger, S. Flament, A. Glazenborg, H. Hannenburg, M. Heininger, Y. Hugues, J. Hron, S. Jankov, F. Kerschbaum, G. Kroes, H. Linz, J.-L. Lizon, Ph. Mathias, R. Mathar, A. Matter, J. Menut, K. Meisenheimer, F. Millour, N. Nardetto, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosoni, J. Olofsson, Y. Rabbia, T. Ratzka, F. Rigal, A. Roussel, D. Schertl, F.-X. Schmider, B. Stecklum, E. Thiebaut, M. Vannier, B. Valat, K. Wagner, L. B. F. M. Waters

Proceedings Volume 7013, 70132B (2008) https://doi.org/10.1117/12.789412

KEYWORDS: Mid-IR, Planets, Stars, Interferometry, Spectral resolution, Spectroscopy, Mirrors, Telescopes, Sensors, Observatories

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Proceedings Article | 28 July 2008 Paper

Paper

Aperture-synthesis imaging with the mid-infrared instrument MATISSE

Karl-Heinz Hofmann, Matthias Heininger, Walter Jaffe, Stefan Kraus, Bruno Lopez, Florentin Millour, Dieter Schertl, Gerd Weigelt, Sebastian Wolf

Proceedings Volume 7013, 70133Y (2008) https://doi.org/10.1117/12.788904

KEYWORDS: Signal to noise ratio, Visibility, Interferometry, Image restoration, Astatine, Photons, Reconstruction algorithms, Mid-IR, Calibration, Image resolution

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Proceedings Article | 28 July 2008 Paper

Paper

VLTI-AMBER observations of Eta Carinae with the FINITO fringe tracker and spectral resolution 12000

Gerd Weigelt, Olivier Chesneau, Thomas Driebe, Renaud Foy, Didier Fraix-Burnet, Jose Groh, Karl-Heinz Hofmann, Stefan Kraus, Fabien Malbet, Alessandro Marconi, Philippe Mathias, Florentin Millour, Jean-Louis Monin, Romain Petrov, Frederik Rantakyrö, Andrea Richichi, Dieter Schertl, Markus Schöller, Philippe Stee, Leonardo Testi, Markus Wittkowski

Proceedings Volume 7013, 701303 (2008) https://doi.org/10.1117/12.796204

KEYWORDS: Visibility, Bromine, Spectral resolution, Phase measurement, Spectroscopy, Interferometry, Stars, Speckle, Telescopes, Binary data

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Proceedings Article | 28 July 2008 Paper

Paper

2008 imaging beauty contest

William Cotton, John Monnier, Fabien Baron, Karl-Heinz Hofmann, Stefan Kraus, Gerd Weigelt, Sridharan Rengaswamy, Eric Thiébaut, Peter Lawson, Walter Jaffe, Christian Hummel, Tom Pauls, Henrique Schmitt, Peter Tuthill, John Young

Proceedings Volume 7013, 70131N (2008) https://doi.org/10.1117/12.788903

KEYWORDS: Data modeling, K band, Interferometry, Image restoration, Reconstruction algorithms, Visibility, Stars, Phase measurement, Image quality, Astronomical imaging

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Proceedings Article | 28 June 2006 Paper

Paper

2006 interferometry imaging beauty contest

Peter Lawson, William Cotton, Christian Hummel, Fabien Baron, John Young, Stefan Kraus, Karl-Heinz Hofmann, Gerd Weigelt, Michael Ireland, John Monnier, Eric Thiébaut, Sridharan Rengaswamy, Olivier Chesneau

Proceedings Volume 6268, 62681U (2006) https://doi.org/10.1117/12.670409

KEYWORDS: Interferometry, Data modeling, Interferometers, Visibility, Image restoration, Image resolution, Reconstruction algorithms, Observatories, Algorithm development, Telescopes

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Proceedings Article | 28 June 2006 Paper

Paper

Aperture synthesis image reconstruction study for the mid-infrared VLTI imager MATISSE

Karl-Heinz Hofmann, Stefan Kraus, Bruno Lopez, Gerd Weigelt, Sebastian Wolf

Proceedings Volume 6268, 62683I (2006) https://doi.org/10.1117/12.671678

KEYWORDS: Visibility, Astatine, Image restoration, Mid-IR, Synthetic apertures, Image quality, Telescopes, Interferometry, Imaging systems, Image resolution

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Proceedings Article | 28 June 2006 Paper

Paper

MATISSE: a four beam combiner in the mid-infrared for the VLTI

S. Lagarde, B. Lopez, P. Antonelli, U. Beckman, J. Behrend, Y. Bresson, O. Chesneau, M. Dugué, A. Glazenborg, U. Graser, K. Hofmann, W. Jaffe, Ch. Leinert, F. Millour, J. Menut, R. Petrov, T. Ratzka, G. Weigelt, S. Wolf, P. Abraham, C. Connot, T. Henning, M. Heininger, Y. Hugues, S. Kraus, W. Laun, A. Matter, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosoni, S. Robbe-Dubois, A. Roussel, D. Schertl, F. Vakili, K. Wagner, L.B.F.M. Waters

Proceedings Volume 6268, 62683M (2006) https://doi.org/10.1117/12.671690

KEYWORDS: Sensors, Signal to noise ratio, Telescopes, Mid-IR, Spectral resolution, Interferometers, Spectroscopes, Phase measurement, Interferometry, Mirrors

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Proceedings Article | 28 June 2006 Paper

Paper

VLTI-AMBER observations of Eta Carinae with high spatial resolution and spectral resolutions of 1,500 and 10,000

Gerd Weigelt, Romain Petrov, Olivier Chesneau, Kris Davidson, Armando Domiciano de Souza, Thomas Driebe, Renaud Foy, Didier Fraix-Burnet, Ted Gull, John Hillier, Karl-Heinz Hofmann, Stefan Kraus, Fabien Malbet, Alessandro Marconi, Philippe Mathias, Jean-Louis Monin, Florentin Millour, Keiichi Ohnaka, Frederik Rantakyrö, Andrea Richichi, Dieter Schertl, Markus Schöller, Philippe Stee, Leonardo Testi, Markus Wittkowski

Proceedings Volume 6268, 62682S (2006) https://doi.org/10.1117/12.671582

KEYWORDS: Visibility, Bromine, Spectral resolution, K band, Stars, Spatial resolution, Phase measurement, Observatories, Interferometry, Near infrared

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Proceedings Article | 27 June 2006 Paper

Paper

MATISSE: perspective of imaging in the mid-infrared at the VLTI

B. Lopez, S. Wolf, S. Lagarde, P. Abraham, P. Antonelli, J. Augereau, U. Beckman, J. Behrend, N. Berruyer, Y. Bresson, O. Chesneau, J. Clausse, C. Connot, K. Demyk, W. Danchi, M. Dugué, S. Flament, A. Glazenborg, U. Graser, T. Henning, K. Hofmann, M. Heininger, Y. Hugues, W. Jaffe, S. Jankov, S. Kraus, W. Laun, Ch. Leinert, H. Linz, Ph. Mathias, K. Meisenheimer, A. Matter, J. Menut, F. Millour, U. Neumann, E. Nussbaum, A. Niedzielski, L. Mosonic, R. Petrov, T. Ratzka, S. Robbe-Dubois, A. Roussel, D. Schertl, F.-X. Schmider, B. Stecklum, E. Thiebaut, F. Vakili, K. Wagner, L. B. F. M. Waters, G. Weigelt

Proceedings Volume 6268, 62680Z (2006) https://doi.org/10.1117/12.671636

KEYWORDS: Mid-IR, Planets, Stars, Spectral resolution, Interferometry, Spectroscopy, Signal to noise ratio, Visibility, Spatial resolution, Sensors

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Proceedings Article | 20 October 2004 Paper

Paper

Infrared imaging of Capella with the IOTA interferometer

Stefan Kraus, F. Peter Schloerb

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.551435

KEYWORDS: Visibility, Interferometers, Stars, Error analysis, Calibration, Data modeling, Infrared imaging, Telescopes, Ultraviolet radiation, Phase measurement

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Proceedings Article | 20 October 2004 Paper

Paper

IOTA: recent technology and science

Wesley Traub, Jean-Philippe Berger, Michael Brewer, Nathaniel Carleton, Pierre Kern, Stefan Kraus, Marc Lacasse, William McGonagle, Rafael Millan-Gabet, John Monnier, Ettore Pedretti, Sam Ragland, Robert Reich, F. Peter Schloerb, Peter Schuller, Kamal Souccar, Gary Wallace

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550916

KEYWORDS: Stars, Cameras, Telescopes, Control systems, Integrated optics, Infrared radiation, Phase measurement, Sensors, Prisms, Interferometers

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Showing 5 of 54 publications

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