Dr. Joschua Hellemeier Profile

Dr. Joschua Hellemeier

at Australian National Univ

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Author

Publications (8)

Proceedings Article | 28 August 2024 Presentation

CaNaPy LGS-AO facility: commissioning and first light

Felipe Pedreros Bustos, David Alaluf, Roberto Biasi, Domenico Bonaccini Calia, Julienne Böttger, Mauro Centrone, Ralf Conzelmann, Marco Faccini, Tomas Fordey, Ivan Guidolin, Wolfgang Hackenberg, Pierre Haguenauer, Joschua Hellemeier, Norbert Hubin, Petr Janout, David Jenkins, Andreas Jost, Noelia Martínez Rey, Tim Morris, James Osborn, Christian Patauner, Dietrich Pescoller, Alfio Puglisi, Marcos Reyes García-Talavera, Luca Sabatini, Laura Salvi, Bernadett Stadler, Matteo Tordi

Proceedings Volume 13097, 130970B (2024) https://doi.org/10.1117/12.3021144

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Proceedings Article | 27 August 2024 Presentation + Paper

Gender equity and diversity in astronomy and adaptive optics: what has changed since 2014 and what more can be done

Celine d'Orgeville, Noelia Martinez Rey, Joschua Hellemeier, Elena Masciadri, François Rigaut, Roger Haynes, Pascale Hibon, Lisa Kewley, Caroline Kulcsár, Joanna Sikora, Ria Singh, Laura Young

Proceedings Volume 13097, 130971E (2024) https://doi.org/10.1117/12.3019314

KEYWORDS: Adaptive optics, Astronomy, Education and training, Engineering, Astronomical telescopes, Observatories, Astrophysics, Scanning transmission electron microscopy, Reflection, Histograms

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Proceedings Article | 27 August 2024 Presentation + Paper

The laser guide star system for the Giant Magellan Telescope laser tomography adaptive optics

Noelia Martinez Rey, Joschua Hellemeier, Hana Benhizia, Mark Blundell, David Chandler, Jesse Cranney, Angela Hernandez Delgado, Grace McGinness, Hajime Ogane, Rachael Rheinberger, Tony Travouillon, Israel Vaughn, Richard Demers, Antonin Bouchez, Marcos Van Dam, Celine D'Orgeville

Proceedings Volume 13097, 1309724 (2024) https://doi.org/10.1117/12.3019822

KEYWORDS: Design, Laser systems engineering, Laser guide stars, Telescopes, Laser beam diagnostics, Sodium, Diagnostics, Observatories, Control systems, Beam divergence

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Proceedings Article | 29 August 2022 Poster + Paper

GIRMOS: preliminary design of the calibration system

Joschua Hellemeier, Bin Ma, Eleanor Uyyek, Paul Hickson

Proceedings Volume 12184, 121845E (2022) https://doi.org/10.1117/12.2624028

KEYWORDS: Calibration, Lamps, Photons, Spectroscopy, Sensors, Spectral calibration, Optical spheres, Imaging systems, Signal to noise ratio, Relays

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Proceedings Article | 29 August 2022 Presentation + Paper

Detailed performance of the preliminary optical design of the Gemini multi-object infrared integral-field spectrograph

Shaojie Chen, Tristan Chabot, Olivier Lardière, Denis Brousseau, Suresh Sivanandam, Simon Thibault, Jenny Atwood, Joschua Hellemeier, Paul Hickson, Scott Chapman, Saugata Dutt, Masen Lamb, Scott Christie, Mark Barnet, Martin Tschimmel, Patrick Nkwari, Gaetano Sivo

Proceedings Volume 12184, 121840E (2022) https://doi.org/10.1117/12.2629027

KEYWORDS: Spectrographs, Iterated function systems, Image quality, Spectral resolution, Adaptive optics, Mirrors, Diffraction, Optical design, Laser imaging, Sensors

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Proceedings Article | 13 December 2020 Poster + Paper

Gemini infrared multi-object spectrograph: calibration system

Paul Hickson, Joschua Hellemeier, Bin Ma, Darren Erickson, Suresh Sivanandam

Proceedings Volume 11447, 114475P (2020) https://doi.org/10.1117/12.2561705

KEYWORDS: Calibration, Gemini Observatory, Astronomical imaging, Spectrographs, Infrared spectroscopy, Infrared radiation, Spectral calibration, Infrared imaging, Adaptive optics, Infrared telescopes

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Proceedings Article | 18 July 2018 Paper

Line of sight mesospheric sodium profiles obtained from the LGS signal for optimal ELT LGS-AO

Joschua Hellemeier, Domenico Bonaccini Calia, Paul Hickson, Thomas Pfrommer, Ron Holzlöhner

Proceedings Volume 10703, 1070340 (2018) https://doi.org/10.1117/12.2312292

KEYWORDS: Sodium, Adaptive optics, Modulation, LIDAR, Continuous wave operation, Telescopes, Wavefront sensors, Laser guide stars, Amplitude modulation, Large telescopes

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Proceedings Article | 17 July 2018 Paper

Simulations of continuous-wave sodium laser guide stars with polarization modulation at Larmor frequency

Felipe Pedreros Bustos, Ronald Holzlöhner, Simon Rochester, Domenico Bonaccini Calia, Joschua Hellemeier, Dmitry Budker

Proceedings Volume 10703, 107033R (2018) https://doi.org/10.1117/12.2313694

KEYWORDS: Modulation, Polarization, Sodium, Continuous wave operation, Laser guide stars, Mesosphere, Optical pumping

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Showing 5 of 8 publications

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