Dr. Julien H. Girard
Scientist at Space Telescope Science Institute
SPIE Involvement:
Author
Area of Expertise:
Astronomy , Adaptive Optics , Instrumentation , High Angular Resolution Techniques , Star and Planet Formation , High Contrast Imaging
Profile Summary

Julien H. Girard is currently an AURA (Full) Scientist at the Space Telescope Science Institute (STScI) in Baltimore, Maryland. Girard supports two flagship missions: JWST/NIRCam and Roman. He leads effort with coronagraphy / high contrast imaging since mid 2017. Member of the long term senior research staff at STScI, Girard's research focuses on constraining the formation and migration mechanisms of giant extra-solar planets in young and dusty circumstellar environments (e.g disks) through direct imaging. Girard uses high angular/contrast imaging techniques extensively, mainly in the infrared, from the ground and space.

From 2009 to 2017 Girard was Operations Staff Astronomer at ESO Chile. Adaptive Optics specialist, he was the lead Instrument Scientist of VLT/SPHERE and NACO. After completing a Master in Instrumentation Physics from the University of Utah in 2000, he obtained a 2nd Master in Astrophysics at UJF/IPAG ( Grenoble) the next year and his PhD in 2005 (UCBL/Observatoire de Lyon), validating the concept of polychromatic laser guide star on-sky.
Before ESO, Girard spent 3 years in Mexico City as a Postdoctoral Fellow at UNAM and as Assistant Professor at IPN. Enjoying public outreach, Julien is one of the ESO Photo Ambassadors.
Publications (57)

Proceedings Article | 24 August 2024 Poster
Julien Girard, Mario Gennaro, Armin Rest, Jarron Leisenring, Bryan Hilbert, Alicia Canipe, Martha Boyer, David Golimowski, Tony Sohn, Ananya Sahoo, Ben Sunnquist, Brian Brooks, Anton Koekemoer, Vera Kozhurina-Platais, Justin Pierel, Aarynn Carter, John Stansberry, Marshall Perrin, Laurent Pueyo, William Balmer, Jens Kammerer, Kellen Lawson, Ell Bogat, Jason Wang, Marcia Rieke
Proceedings Volume 13092, 1309251 (2024) https://doi.org/10.1117/12.3020243

Proceedings Article | 23 August 2024 Presentation + Paper
Dmitry Savransky, Vanessa Bailey, Schuyler Wolff, Maxwell Millar-Blanchaer, Jason Wang, Lisa Altinier, Ramya Anche, Pierre Baudoz, Beth Biller, Sarah Blunt, Wolfgang Brandner, Marah Brinjikji, Oscar Carrión-González, Amanda Chavez, Elodie Choquet, David Doelman, Julien Girard, Alexandra Greenbaum, Samantha Hasler, Justin Hom, James Ingalls, Stephen Kane, N. Jeremy Kasdin, Oliver Krause, Masayuki Kuzuhara, Alexis Lau, Zhexing Li, John Livingston, Patrick Lowrance, Kevin Ludwick, Bruce Macintosh, Eric Mamajek, Mark Marley, Johan Mazoyer, Bertrand Mennesson, Toshiyuki Mizuki, Sarah Moran, Naoshi Murakami, Jun Nishikawa, Malachi Noel, Laurent Pueyo, Sergi Hildebrandt Rafels, Jason Rhodes, Tyler Robinson, Robert De Rosa, Matthias Samland, Nicholas Schragal, Jürgen Schreiber, Jennifer Sobeck, Karl Stapelfeldt, Motohide Tamura, Taichi Uyajma, Arthur Vigan, Michele Woodland, Marie Ygouf, Kenta Yoneta, Robert Zellem, Neil Zimmerman
Proceedings Volume 13092, 130921I (2024) https://doi.org/10.1117/12.3020514
KEYWORDS: Coronagraphy, Stars, Observatories, Space telescopes, Wavefronts, Telescopes, Planets, Observational astronomy, Exoplanets

Proceedings Article | 23 August 2024 Paper
Maxwell Andrew Millar-Blanchaer, Jason Wang, Ellis Bogat, Jürgen Schreiber, Marie Ygouf, Kevin Ludwick, Alexandra Greenbaum, Vanessa Bailey, Sergi Hildebrandt Rafels, Dmitry Savransky, Matthias Samland, Lisa Altinier, Ramya Anche, Beth Biller, Amanda Chavez, Elodie Choquet, Julien Girard, Justin Hom, James Ingalls, N. Jeremy Kasdin, Oliver Krause, John Livingston, Johan Mazoyer, Laurent Pueyo, Taichi Uyama, Robert Zellem, Neil Zimmerman
Proceedings Volume 13092, 1309256 (2024) https://doi.org/10.1117/12.3020478
KEYWORDS: Calibration, Coronagraphy, Simulations, Observational astronomy, Data processing, Exoplanets, Equipment, Analog electronics, Space telescopes, Signal processing

Proceedings Article | 23 August 2024 Poster + Paper
Schuyler Wolff, Jason Wang, Karl Stapelfeldt, Vanessa Bailey, Dmitry Savransky, Justin Hom, Beth Biller, Wolfgang Brandner, Ramye Anche, Sarah Blunt, Marah Brinjikji, Julien Girard, Oliver Krause, Zhexing Li, John Livingston, Maxwell Millar-Blanchaer, Malachi Noel, Laurent Pueyo, Robert De Rosa, Matthias Samland, Nicholas Schragal
Proceedings Volume 13092, 1309255 (2024) https://doi.org/10.1117/12.3020205
KEYWORDS: Stars, Coronagraphy, Exoplanets, Databases, Imaging spectroscopy, Observatories

Proceedings Article | 29 August 2022 Open Access Presentation
Jonathan Gardner, Nora Lützgendorf, Julien Girard, Sarah Kendrew, Swara Ravindranath
Proceedings Volume 12180, 1218003 (2022) https://doi.org/10.1117/12.2646871

Proceedings Article | 27 August 2022 Poster + Presentation + Paper
Julien Girard, Jarron Leisenring, Jens Kammerer, Mario Gennaro, Marcia Rieke, John Stansberry, Armin Rest, Eiichi Egami, Ben Sunnquist, Martha Boyer, Alicia Canipe, Matteo Correnti, Bryan Hilbert, Marshall Perrin, Laurent Pueyo, Remi Soummer, Marsha Allen, Howard Bushouse, Jonathan Aguilar, Brian Brooks, Dan Coe, Audrey DiFelice, David Golimowski, George Hartig, Dean Hines, Anton Koekemoer, Bryony Nickson, Nikolay Nikolov, Vera Kozhurina-Platais, Nor Pirzkal, Massimo Robberto, Anand Sivaramakrishnan, Sangmo Tony Sohn, Randal Telfer, Chi Rai Wu, Thomas Beatty, Michael Florian, Kevin Hainline, Doug Kelly, Karl Misselt, Everett Schlawin, Fengwu Sun, Christina Williams, Christopher Willmer, Christopher Stark, Marie Ygouf, Aarynn Carter, Charles Beichman, Thomas Greene, Thomas Roellig, John Krist, Jéa Adams Redai, Jason Wang, Charles Clark, Dan Lewis, Malcolm Ferry
Proceedings Volume 12180, 121803Q (2022) https://doi.org/10.1117/12.2629636
KEYWORDS: Coronagraphy, Stars, James Webb Space Telescope, Point spread functions, Distortion, Telescopes, Signal to noise ratio, Calibration, Target acquisition, Exoplanets, Astronomical imaging, Near infrared, Direct methods, Astronomical instrumentation

Proceedings Article | 27 August 2022 Presentation + Paper
Proceedings Volume 12180, 121801Z (2022) https://doi.org/10.1117/12.2627567
KEYWORDS: Calibration, Stars, Coronagraphy, Planets, Sensors, Polarization, Point spread functions, Error analysis, Signal to noise ratio, Uranus

Proceedings Article | 27 August 2022 Paper
Proceedings Volume 12180, 121803N (2022) https://doi.org/10.1117/12.2628865
KEYWORDS: Coronagraphy, James Webb Space Telescope, Target acquisition, Data processing, Telescopes, Calibration, Interferometry, Image registration

Proceedings Article | 27 August 2022 Presentation + Paper
Sasha Hinkley, Aarynn Carter, Shrishmoy Ray, Beth Biller, Andrew Skemer, Elodie Choquet, Maxwell Millar-Blanchaer, Stephanie Sallum, Brittany Miles, Niall Whiteford, Polychronis Patapis, Marshall Perrin, Laurent Pueyo, Karl Stapelfeldt, Jason Wang, Kimberly Ward-Duong, Julien Girard, Dean Hines, Jens Kammerer, Jarron Leisenring, Yifan Zhou, Michael Meyer, Michael Liu, Mickael Bonnefoy, Simon Petrus, Mariangela Bonavita, Gael Chauvin, Christine Chen, Thayne Currie, Kielan K. Hoch, Cecilia Lazzoni, Elisabeth Matthews, Michael McElwain, Isabel Rebollido, Emily Rickman, Glenn Schneider, Anand Sivaramakrishnan, Jordan Stone
Proceedings Volume 12180, 121800S (2022) https://doi.org/10.1117/12.2629919
KEYWORDS: James Webb Space Telescope, Coronagraphy, Planets, Exoplanets, Imaging systems, Astronomy, Imaging spectroscopy, Spectroscopy, Stars, Calibration

Proceedings Article | 3 September 2021 Presentation + Paper
Aarynn Carter, Andrew J. Skemer, Camilla Danielski, Jarron Leisenring, Jason Wang, Kyle Van Gorkom, Brian York, Jea Adams, Beth Biller, Julien Girard, Sasha Hinkley, Bryony Nickson, Marshall Perrin, Laurent Pueyo
Proceedings Volume 11823, 118230H (2021) https://doi.org/10.1117/12.2594501
KEYWORDS: James Webb Space Telescope, Point spread functions, Coronagraphy, Wavefronts, Computer simulations, Device simulation, Target acquisition, Telescopes, Sensors, Exoplanets

SPIE Journal Paper | 5 August 2021 Open Access
Anne-Lise Maire, Maud Langlois, Philippe Delorme, Gaël Chauvin, Raffaele Gratton, Arthur Vigan, Julien Girard, Zahed Wahhaj, Jörg-Uwe Pott, Leonard Burtscher, Anthony Boccaletti, Alexis Carlotti, Thomas Henning, Matthew Kenworthy, Pierre Kervella, Emily Rickman, Tobias O. Schmidt
JATIS, Vol. 7, Issue 03, 035004, (August 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.3.035004
KEYWORDS: Optical spheres, Calibration, Stars, Distortion, Coronagraphy, Exoplanets, Telescopes, Imaging systems, Adaptive optics, Sensors

SPIE Journal Paper | 28 May 2021 Open Access
JATIS, Vol. 7, Issue 02, 021218, (May 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.021218
KEYWORDS: Planets, Exoplanets, Imaging systems, Signal to noise ratio, Stars, Coronagraphy, Telescopes, Data modeling, Point spread functions, Sensors

Proceedings Article | 23 December 2020 Poster + Paper
Proceedings Volume 11443, 114433N (2020) https://doi.org/10.1117/12.2561628
KEYWORDS: James Webb Space Telescope, Data processing, Image processing, Human-computer interaction, Exoplanets, Planets, Point spread functions, Control systems, Coronagraphy, Environmental sensing

Proceedings Article | 16 December 2020 Presentation + Paper
Julien Girard, Sebastiaan Haffert, Jaehan Bae, Peter Zeidler, Jozua de Boer, Alexander Bohn, Rob van Holstein, Jarle Brinchmann, Ignas Snellen, Rolan Bacon, Christoph Keller
Proceedings Volume 11448, 1144808 (2020) https://doi.org/10.1117/12.2560075
KEYWORDS: Planets, Adaptive optics, Stars, Spatial resolution, Planetary systems, Near infrared, Spectrographs, Point spread functions, Image resolution, Iterated function systems

Proceedings Article | 16 December 2020 Presentation + Paper
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

Proceedings Article | 15 December 2020 Poster + Presentation + Paper
Julien Girard, Ell Bogat, Junellie Gonzalez-Quiles, Sergi Hildebrandt, Stephen Kane, Zhexing Li, Margaret Turnbull, Christopher Stark, Avi Mandell, Tiffany Meshkat, Neil Zimmerman
Proceedings Volume 11443, 1144337 (2020) https://doi.org/10.1117/12.2561736
KEYWORDS: Exoplanets, Coronagraphy, Planets, Imaging systems, Stars, Point spread functions, Astrophysics, Contamination, Light, Wavefronts

Proceedings Article | 17 August 2018 Paper
Julien Girard, William Blair, Brian Brooks, Keira Brooks, Robert Brown, Howard Bushouse, Alicia Canipe, Christine Chen, Matteo Correnti, J. Brendan Hagan, Bryan Hilbert, Dean Hines, Jarron Leisenring, Joseph Long, Bryony Nickson, Marshall Perrin, Klaus Pontoppidan, Laurent Pueyo, Abhijith Rajan, Adric Riedel, Remi Soummer, John Stansberry, Christopher Stark, Kyle Van Gorkom, Brian York
Proceedings Volume 10698, 106983V (2018) https://doi.org/10.1117/12.2314198
KEYWORDS: Coronagraphy, Point spread functions, James Webb Space Telescope, Stars, Signal to noise ratio, Exoplanets, Calibration, Visibility, Space telescopes, Device simulation

Proceedings Article | 9 August 2018 Paper
Vanessa Bailey, Michael Bottom, Eric Cady, Faustine Cantalloube, Jozua de Boer, Tyler Groff, John Krist, Maxwell Millar-Blanchaer, Arthur Vigan, Jeffrey Chilcote, Elodie Choquet, Robert De Rosa, Julien Girard, Olivier Guyon, Brian Kern, Anne-Marie Lagrange, Bruce Macintosh, Jared Males, Christian Marois, Tiffany Meshkat, Julien Milli, Mamadoue N'Diaye, Henry Ngo, Eric Nielsen, Jason Rhodes, Garreth Ruane, Rob van Holstein, Jason Wang, Wenhao Xuan
Proceedings Volume 10698, 106986P (2018) https://doi.org/10.1117/12.2313820
KEYWORDS: Calibration, Stars, Point spread functions, Polarization, Coronagraphy, Satellites, Telescopes, Planets, Polarimetry, Imaging spectroscopy

Proceedings Article | 6 August 2018 Presentation + Paper
Marshall Perrin, Laurent Pueyo, Kyle Van Gorkom, Keira Brooks, Abhijith Rajan, Julien Girard, Charles-Philippe Lajoie
Proceedings Volume 10698, 1069809 (2018) https://doi.org/10.1117/12.2313552
KEYWORDS: Point spread functions, Coronagraphy, Wavefronts, James Webb Space Telescope, Calibration, Observatories, Telescopes, Exoplanets, Wavefront aberrations

Proceedings Article | 10 July 2018 Presentation + Paper
J. Milli, M. Kasper, P. Bourget, C. Pannetier, D. Mouillet, J.-F. Sauvage, C. Reyes, T. Fusco, F. Cantalloube, K. Tristam, Z. Wahhaj, J.-L. Beuzit, J. Girard, D. Mawet, A. Telle, A. Vigan, M. N'Diaye
Proceedings Volume 10703, 107032A (2018) https://doi.org/10.1117/12.2311499
KEYWORDS: Telescopes, Adaptive optics, Point spread functions, Optical coatings, Wind measurement, Coronagraphy, Diffraction

Proceedings Article | 9 July 2018 Presentation
Proceedings Volume 10702, 107020T (2018) https://doi.org/10.1117/12.2312783
KEYWORDS: Coronagraphy, Infrared radiation, Mid-IR, Infrared cameras, Observatories, Keck Observatory, Data processing, Planets, Cameras, K band

Proceedings Article | 12 September 2017 Presentation + Paper
Rob van Holstein, Frans Snik, Julien Girard, Jozua de Boer, C. Ginski, Christoph Keller, Daphne Stam, Jean-Luc Beuzit, David Mouillet, Markus Kasper, Maud Langlois, Alice Zurlo, Remco de Kok, Arthur Vigan
Proceedings Volume 10400, 1040015 (2017) https://doi.org/10.1117/12.2272554
KEYWORDS: Polarization, Polarimetry, Planets, Signal detection, Principal component analysis, Exoplanets, Telescopes, Stars, Solids, Speckle

Proceedings Article | 2 September 2016 Paper
Julien Girard, Martin Tourneboeuf
Proceedings Volume 9909, 99097V (2016) https://doi.org/10.1117/12.2231493
KEYWORDS: Image quality, Point spread functions, Telescopes, Observatories, Adaptive optics, Stars, Photometry, Electroluminescent displays, Signal to noise ratio, Strontium

Proceedings Article | 16 August 2016 Paper
Proceedings Volume 9907, 99072U (2016) https://doi.org/10.1117/12.2233108
KEYWORDS: Point spread functions, Interferometry, Spatial filters, Image filtering, Large telescopes, Optical filters, Wavefronts, Spatial frequencies, Diffraction, Single mode fibers

Proceedings Article | 9 August 2016 Paper
Proceedings Volume 9908, 99083D (2016) https://doi.org/10.1117/12.2233953
KEYWORDS: Wavefronts, Optical spheres, Cameras, Actuators, Calibration, Coronagraphy, Mirrors, Infrared radiation, Sensors, Iterated function systems

Proceedings Article | 9 August 2016 Paper
Proceedings Volume 9908, 990834 (2016) https://doi.org/10.1117/12.2233013
KEYWORDS: Optical spheres, Iterated function systems, Calibration, Distortion, Planets, Electroluminescent displays, Coronagraphy, Stars, Data centers, Error analysis

Proceedings Article | 9 August 2016 Paper
Olivier Absil, Dimitri Mawet, Mikael Karlsson, Brunella Carlomagno, Valentin Christiaens, Denis Defrère, Christian Delacroix, Bruno Femenía Castella, Pontus Forsberg, Julien Girard, Carlos Gómez González, Serge Habraken, Philip Hinz, Elsa Huby, Aïssa Jolivet, Keith Matthews, Julien Milli, Gilles Orban de Xivry, Eric Pantin, Pierre Piron, Maddalena Reggiani, Garreth Ruane, Gene Serabyn, Jean Surdej, Konrad R. Tristram, Ernesto Vargas Catalán, Olivier Wertz, Peter Wizinowich
Proceedings Volume 9908, 99080Q (2016) https://doi.org/10.1117/12.2233289
KEYWORDS: Thermography, Infrared radiation, Coronagraphy, Stars, L band, Planets, Etching, Diamond, Telescopes, Cameras

Proceedings Article | 9 August 2016 Paper
R. Claudi, J. Antichi, A. Baruffolo, P. Bruno, E. Cascone, V. DeCaprio, M. DePascale, S. Desidera, V. D'Orazi, D. Fantinel, G. Farisato, E. Giro, R. Gratton, L. Lessio, A.L. Maire, D. Mesa, B. Salasnich, S. Scuderi, E. Sissa, M. Turatto, A. Zurlo, JL Beuzit, A. Boccaletti, G. Chauvin, K. Dohlen, G. Finger, J. Girard, M. Kasper, N. Hubin, M. Langlois, J. L. Lizon, D. Mouillet, P. Puget, F. Wildi
Proceedings Volume 9908, 99083H (2016) https://doi.org/10.1117/12.2232827
KEYWORDS: Iterated function systems, Optical spheres, Imaging systems, Exoplanets, Stars, Polarization, Visible radiation, Iterated function systems, Optical spheres, Principal component analysis, Coronagraphy, Planets

Proceedings Article | 4 August 2016 Paper
Proceedings Volume 9907, 99072T (2016) https://doi.org/10.1117/12.2231983
KEYWORDS: Optical spheres, Interferometry, Visible radiation, Adaptive optics, Imaging systems, Wavefronts, Iterated function systems, Point spread functions, Calibration, Polarimetry

Proceedings Article | 27 July 2016 Paper
Proceedings Volume 9909, 99096S (2016) https://doi.org/10.1117/12.2232463
KEYWORDS: Wavefront sensors, Exoplanets, Exoplanets, Sensors, Wavefront sensors, Wavefronts, Coronagraphy, Optical spheres, Calibration, Point spread functions, Actuators, Photomasks

Proceedings Article | 27 July 2016 Paper
Proceedings Volume 9909, 99094Z (2016) https://doi.org/10.1117/12.2231703
KEYWORDS: Adaptive optics, Speckle, Optical spheres, Point spread functions, Adaptive optics, Optical spheres, Coronagraphy, Sensors, Stars, Telescopes, Lamps, Camera shutters

Proceedings Article | 26 July 2016 Paper
Proceedings Volume 9909, 99090U (2016) https://doi.org/10.1117/12.2233319
KEYWORDS: Adaptive optics, Optical spheres, Exoplanets, Stars, Adaptive optics, Coronagraphy, Telescopes, Calibration, Near infrared, Image quality, Control systems

Proceedings Article | 26 July 2016 Paper
Proceedings Volume 9909, 990916 (2016) https://doi.org/10.1117/12.2232459
KEYWORDS: Optical spheres, Adaptive optics, Planets, Stars, Exoplanets, Telescopes, Wind measurement, Spatial frequencies, Control systems, Radiative transfer

Proceedings Article | 11 July 2016 Paper
Henri Boffin, Dimitri Gadotti, Joe Anderson, Andres Pino, Willem-Jan de Wit, Julien Girard
Proceedings Volume 9910, 991032 (2016) https://doi.org/10.1117/12.2232105
KEYWORDS: Astronomical telescopes, Telescopes, Adaptive optics, Interferometry, Observatories, Astronomy, Particle swarm optimization, Calibration, Optical interferometry, Infrared telescopes

Proceedings Article | 11 July 2016 Paper
Wolfgang Hummel, Julien Girard, Julien Milli, Zahed Wahhaj, Lars Lundin, Arthur Vigan
Proceedings Volume 9910, 99102O (2016) https://doi.org/10.1117/12.2231423
KEYWORDS: Optical spheres, Control systems, Radio astronomy, Observatories, Systems engineering, Scanning transmission electron microscopy, Surgery, Software, Computing systems, Data storage

SPIE Journal Paper | 24 May 2016
JATIS, Vol. 2, Issue 02, 025003, (May 2016) https://doi.org/10.1117/12.10.1117/1.JATIS.2.2.025003
KEYWORDS: Optical spheres, Adaptive optics, Actuators, Turbulence, Coronagraphy, Point spread functions, Calibration, Mirrors, Telescopes, Observatories

Proceedings Article | 22 August 2014 Paper
Proceedings Volume 9148, 91485P (2014) https://doi.org/10.1117/12.2058594
KEYWORDS: Adaptive optics, Spatial frequencies, Interferometry, Spatial filters, Imaging systems, Point spread functions, Actuators, Wavefronts, Optical filters, Image filtering

Proceedings Article | 13 August 2014 Paper
Elisabeth Brunner, Julien Girard
Proceedings Volume 9148, 914861 (2014) https://doi.org/10.1117/12.2055614
KEYWORDS: Adaptive optics, Data modeling, Telescopes, Wavefront sensors, Atmospheric turbulence, Atmospheric modeling, Turbulence, Atmospheric sensing, Statistical analysis, Statistical modeling

Proceedings Article | 7 August 2014 Paper
Proceedings Volume 9148, 91481U (2014) https://doi.org/10.1117/12.2055423
KEYWORDS: Adaptive optics, Optical spheres, Coronagraphy, Actuators, Point spread functions, Telescopes, Exoplanets, Speckle, Control systems, Sensors

Proceedings Article | 7 August 2014 Paper
Proceedings Volume 9148, 91484T (2014) https://doi.org/10.1117/12.2057263
KEYWORDS: Adaptive optics, Image quality, Image analysis, Wavefront sensors, Telescopes, Observatories, Infrared radiation, Infrared imaging, Computer simulations, Imaging systems

Proceedings Article | 28 July 2014 Paper
Jozua de Boer, Julien Girard, Dimitri Mawet, Frans Snik, Christoph Keller, Julien Milli
Proceedings Volume 9147, 914787 (2014) https://doi.org/10.1117/12.2054970
KEYWORDS: Polarization, Information operations, Telescopes, Calibration, Polarimetry, Mueller matrices, Wave plates, Mirrors, Stray light, Stars

Proceedings Article | 26 September 2013 Paper
Dimitri Mawet, Olivier Absil, Julien Milli, Christian Delacroix, Julien Girard, Jared O'Neal, Pierre Baudoz, Anthony Boccaletti, Pierre Bourget, Pontus Forsberg, Frederic Gonté, Serge Habraken, Mikael Karlsson, Markus Kasper, Anne-Marie Lagrange, Jean-Louis Lizon, Koraljka Muzic, Eduardo Peña, Richard Olivier, Nicolas Slusarenko, Lowell Tacconi-Garman, Jean Surdej
Proceedings Volume 8864, 88640I (2013) https://doi.org/10.1117/12.2025501
KEYWORDS: Coronagraphy, Stars, Principal component analysis, Point spread functions, L band, Adaptive optics, Exoplanets, Space telescopes, Planets, Observatories

Proceedings Article | 26 September 2013 Paper
P. Bourget, D. Mawet, P. Mardones, N. Schuhler, L. Pueyo, J. Girard, P. Haguenauer, F. Gonte
Proceedings Volume 8864, 88640J (2013) https://doi.org/10.1117/12.2026211
KEYWORDS: Phase shift keying, Coronagraphy, Modulation, Phase modulation, Amplitude modulation, Speckle, Avalanche photodetectors, High dynamic range imaging, Demodulation, Stars

Proceedings Article | 24 September 2012 Paper
Proceedings Volume 8446, 84467Z (2012) https://doi.org/10.1117/12.927162
KEYWORDS: Adaptive optics, Coronagraphy, Image resolution, Spectroscopy, Telescopes, Sensors, Mirrors, Device simulation, Wavefront sensors, Polarization

Proceedings Article | 21 September 2012 Paper
Proceedings Volume 8442, 844204 (2012) https://doi.org/10.1117/12.927245
KEYWORDS: Coronagraphy, Space telescopes, Telescopes, Adaptive optics, Stars, Spiral phase plates, Planets, Wavefronts, Cameras, Modulation

Proceedings Article | 13 September 2012 Paper
Julien H. Girard, Jared O'Neal, Dimitri Mawet, Markus Kasper, Gérard Zins, Benoît Neichel, Johann Kolb, Valentin Christiaens, Martin Tourneboeuf
Proceedings Volume 8447, 84470L (2012) https://doi.org/10.1117/12.925660
KEYWORDS: Adaptive optics, Calibration, Point spread functions, Stars, Coronagraphy, Image quality, Telescopes, Electroluminescent displays, Optical spheres, Imaging systems

Proceedings Article | 13 September 2012 Paper
J. Kolb, N. Muller, E. Aller-Carpentier, P. Andrade, J. Girard
Proceedings Volume 8447, 84475U (2012) https://doi.org/10.1117/12.926402
KEYWORDS: Adaptive optics, Turbulence, Point spread functions, Reconstruction algorithms, Zernike polynomials, Atmospheric modeling, Telescopes, Data modeling, Computer simulations, Instrument modeling

Proceedings Article | 13 September 2012 Paper
P. Bourget, N. Schuhler, D. Mawet, P. Haguenauer, J. Girard, Frederic Gonte
Proceedings Volume 8450, 84505I (2012) https://doi.org/10.1117/12.927284
KEYWORDS: Coronagraphy, Polarization, Nulling interferometry, Phase shifts, Avalanche photodetectors, Diffraction, Phase shift keying, Liquid crystals, Mercury, Control systems

Proceedings Article | 12 September 2012 Paper
Proceedings Volume 8445, 84453M (2012) https://doi.org/10.1117/12.926915
KEYWORDS: Asteroids, Speckle imaging, Speckle, Observatories, Spatial resolution, Stars, Adaptive optics, Calibration, Signal to noise ratio, Telescopes

Proceedings Article | 6 October 2011 Paper
Fabien Patru, Jacopo Antichi, Julien Girard
Proceedings Volume 8172, 81720W (2011) https://doi.org/10.1117/12.896920
KEYWORDS: Point spread functions, Telescopes, Spatial filters, Adaptive optics, Spatial frequencies, Interferometry, Diffraction, Optical filters, Image filtering, Image resolution

Proceedings Article | 1 October 2011 Paper
Jacopo Antichi, Patrick Rabou, Fabien Patru, Enrico Giro, Julien Girard, Denis Mourard
Proceedings Volume 8172, 81720X (2011) https://doi.org/10.1117/12.896926
KEYWORDS: Spatial filters, Telescopes, Diffraction, Interferometry, Optical design, Optical filters, Adaptive optics, Wavefronts, Cameras, K band

Proceedings Article | 29 July 2010 Paper
Proceedings Volume 7736, 77362N (2010) https://doi.org/10.1117/12.856799
KEYWORDS: Adaptive optics, Stars, Point spread functions, Imaging systems, K band, Speckle, Wavefront sensors, Exoplanets, Coronagraphy, Holography

Proceedings Article | 22 July 2010 Paper
Proceedings Volume 7734, 773436 (2010) https://doi.org/10.1117/12.857373
KEYWORDS: IRIS Consortium, Strontium, Adaptive optics, Mirrors, Stars, Deformable mirrors, Diamond, Observatories, Telescopes, Modulation

Proceedings Article | 22 July 2010 Paper
Proceedings Volume 7734, 77341B (2010) https://doi.org/10.1117/12.857393
KEYWORDS: Speckle, Speckle imaging, Stars, Telescopes, Device simulation, Calibration, Binary data, Adaptive optics, Atmospheric modeling, Instrument modeling

Proceedings Article | 16 July 2010 Paper
Proceedings Volume 7735, 773532 (2010) https://doi.org/10.1117/12.856811
KEYWORDS: Point spread functions, Coronagraphy, Stars, Planets, Diffraction, Exoplanets, Telescopes, Cameras, Computer programming, Observatories

Proceedings Article | 17 July 2008 Paper
Julien H. V. Girard, Alan Watson, Luís Carlos Álvarez, Oscar Chapa, Salvador Cuevas, Ruben Flores, Fernando Garfias, Arturo Iriarte, Luís Artemio Martínez, Beatriz Sánchez
Proceedings Volume 7015, 701560 (2008) https://doi.org/10.1117/12.788595
KEYWORDS: Adaptive optics, Stars, Telescopes, Diffraction, Imaging systems, Charge-coupled devices, Mirrors, Optical imaging, Sensors, Atmospheric optics

Proceedings Article | 24 September 2007 Paper
Renaud Foy, Pierre Éric, Jérôme Eysseric, Françoise Foy, Thierry Fusco, Julien Girard, Auguste Le Van Suu, Sandrine Perruchot, Pierre Richaud, Yoann Richaud, Xavier Rondeau, Michel Tallon, Éric Thiébaut, Michel Boër
Proceedings Volume 6691, 66910R (2007) https://doi.org/10.1117/12.733997
KEYWORDS: Telescopes, Mesosphere, Projection systems, Sodium, Laser guide stars, Adaptive optics, Photons, Algorithm development, Stars, Wavefronts

Showing 5 of 57 publications
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