Dr. Joschua Hellemeier Profile

Dr. Joschua Hellemeier

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Publications (5)

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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