Prof. Roberto G. Abraham Profile

Prof. Roberto G. Abraham

at Univ of Toronto

SPIE Involvement:

Author

Publications (17)

Proceedings Article | 11 September 2024 Poster + Paper

Poster + Paper

Realizing the potential of the Dragonfly Spectral Line Mapper: calibration methods and on-sky performance

Deborah Lokhorst, Seery Chen, Imad Pasha, Victoria Purcell, William Bowman, Qing Liu, Zili Shen, Aidan MacNichol, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 13094, 130942N (2024) https://doi.org/10.1117/12.3018958

KEYWORDS: Tunable filters, Calibration, Bandpass filters, Telescopes, Galactic astronomy, Optical filters, Data modeling, Sensors, Emission wavelengths

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Proceedings Article | 11 September 2024 Poster + Paper

Poster + Paper

The Dragonfly Spectral Line Mapper: completion of the 120-lens array

Seery Chen, Deborah Lokhorst, Imad Pasha, William Bowman, Qing Liu, Zili Shen, Aiden MacNichol, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 13094, 130942J (2024) https://doi.org/10.1117/12.3019491

KEYWORDS: Extragalactic astronomy, Tunable filters, Optical filters, Lenses, Cameras, Design, Bandpass filters, Baffles, Dark current, Telescopes

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Proceedings Article | 25 July 2024 Presentation + Paper

Presentation + Paper

Software infrastructure for the highly-distributed semi-autonomous Dragonfly spectral line mapper

Imad Pasha, Seery Chen, Deborah Lokhorst, William Bowman, Zili Shen, Qing Liu, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 13101, 1310107 (2024) https://doi.org/10.1117/12.3019506

KEYWORDS: Tunable filters, Equipment, Lenses, Optical filters, Computer hardware, Cameras, Telescopes

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

A low-cost ultraviolet-to-infrared absolute quantum efficiency characterization system of detectors

Ajay Gill, Mohamed Shaaban, Aaron Tohuvavohu, Suresh Sivanandam, Roberto Abraham, Seery Chen, Maria Drout, Deborah Lokhorst, Christopher Matzner, Stefan Mochnacki, Calvin Netterfield

Proceedings Volume 12191, 1219114 (2022) https://doi.org/10.1117/12.2627564

KEYWORDS: Quantum efficiency, Sensors, Photodiodes, Electrons, CMOS sensors, Monochromators, Lamps, Cameras, Integrating spheres, Optical filters

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Distributed aperture telescopes and the Dragonfly Telephoto Array

Roberto Abraham, Pieter van Dokkum, Deborah Lokhorst, Seery Chen, Qing Liu, Michael Rice, E. Lynn Rice

Proceedings Volume 12182, 121821W (2022) https://doi.org/10.1117/12.2629585

KEYWORDS: Telescopes, Sensors, Lenses, Imaging systems, Astronomical telescopes, Optical instrument design, Large telescopes

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Proceedings Article | 26 August 2022 Poster + Presentation + Paper

Poster + Presentation + Paper

The Dragonfly Spectral Line Mapper: design and first light

Seery Chen, Deborah Lokhorst, Jeff Shen, Imad Pasha, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 12182, 121824E (2022) https://doi.org/10.1117/12.2629582

KEYWORDS: Optical filters, Bandpass filters, Actuators, Cameras, Telescopes, Sensors, Calibration, Spectroscopy, Interference filters, Galactic astronomy

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

The pathfinder Dragonfly Spectral Line Mapper: pushing the limits for ultra-low surface brightness spectroscopy

Deborah Lokhorst, Seery Chen, Imad Pasha, Jeff Shen, Evgeni Malakhov, Roberto Abraham, Pieter van Dokkum

Proceedings Volume 12182, 121821T (2022) https://doi.org/10.1117/12.2629396

KEYWORDS: Optical filters, Telescopes, Calibration, Galactic astronomy, Data modeling, Bandpass filters, Image filtering, Amplifiers, Contamination, Sensors

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Wide-field ultra-narrow-bandpass imaging with the Dragonfly Telephoto Array

Deborah Lokhorst, Roberto Abraham, Pieter van Dokkum, Seery Chen

Proceedings Volume 11445, 1144527 (2020) https://doi.org/10.1117/12.2561162

KEYWORDS: Imaging systems, Refractor telescopes, Telescopes, Lenses, Image filtering, Galactic astronomy, Instrument modeling, Calibration

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Gemini infrared multi-object spectrograph: instrument overview

Suresh Sivanandam, Scott Chapman, Luc Simard, Paul Hickson, Kim Venn, Simon Thibault, Marcin Sawicki, Adam Muzzin, Darren Erickson, Roberto Abraham, Masayuki Akiyama, David Andersen, Colin Bradley, Raymond Carlberg, Shaojie Chen, Carlos Correia, Tim Davidge, Sara Ellison, Kamal El-Sankary, Gregory Fahlman, Masen Lamb, Olivier Lardière, Marie Lemoine-Busserolle, Dae-Sik Moon, Norman Murray, Alison Peck, Cyrus Shafai, Gaetano Sivo, Jean-Pierre Veran, Howard Yee

Proceedings Volume 10702, 107021J (2018) https://doi.org/10.1117/12.2313924

KEYWORDS: Spectrographs, Galactic astronomy, Adaptive optics, Telescopes, James Webb Space Telescope, Stars, Infrared spectroscopy, Infrared radiation, Gemini Observatory, Imaging spectroscopy

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Proceedings Article | 24 September 2012 Paper

Paper

Characterizing near-infrared sky brightness in the Canadian high arctic

Suresh Sivanandam, James Graham, Roberto Abraham, Anthony Tekatch, Eric Steinbring, Wayne Ngan, Doug Welch, Nicholas Law

Proceedings Volume 8446, 844643 (2012) https://doi.org/10.1117/12.926251

KEYWORDS: Photometry, Calibration, Diodes, Solids, Photodiodes, Near infrared, Astronomy, Airglow, Sun, Temperature metrology

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Proceedings Article | 21 September 2012 Paper

Paper

The JWST Fine Guidance Sensor (FGS) and Near-Infrared Imager and Slitless Spectrograph (NIRISS)

René Doyon, John Hutchings, Mathilde Beaulieu, Loic Albert, David Lafrenière, Chris Willott, Driss Touahri, Neil Rowlands, Micheal Maszkiewicz, Alex Fullerton, Kevin Volk, André Martel, Pierre Chayer, Anand Sivaramakrishnan, Roberto Abraham, Laura Ferrarese, Ray Jayawardhana, Doug Johnstone, Michael Meyer, Judith Pipher, Marcin Sawicki

Proceedings Volume 8442, 84422R (2012) https://doi.org/10.1117/12.926578

KEYWORDS: Sensors, Spectroscopy, Imaging spectroscopy, Stars, Exoplanets, James Webb Space Telescope, Atmospheric modeling, Imaging systems, Point spread functions, Spectrographs

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Proceedings Article | 5 August 2010 Paper

Paper

The JWST tunable filter imager (TFI)

R. Doyon, J. Hutchings, N. Rowlands, C. Evans, E. Greenberg, C. Haley, A. Scott, D. Touahri, M. Beaulieu, D. Lafrenière, R. Abraham, E. Barton, P. Chayer, L. Ferrarese, A. Fullerton, R. Jayawardhana, D. Johnstone, A. Martel, A. W. M. R. Meyer, J. Pipher, K. Saad, M. Sawicki, A. Sivaramakrishnan, K. Volk

Proceedings Volume 7731, 77310F (2010) https://doi.org/10.1117/12.857382

KEYWORDS: Fabry–Perot interferometers, James Webb Space Telescope, Coronagraphy, Coating, Sensors, Exoplanets, Imaging systems, Tunable filters, Spectral resolution, Space telescopes

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Proceedings Article | 21 July 2010 Paper

Paper

Upgraded GMOS-N science detectors: schedule and commissioning plans

Katherine Roth, Scot Kleinman, E. Rodrigo Carrasco, Timothy Davidge, Roberto Abraham

Proceedings Volume 7735, 773580 (2010) https://doi.org/10.1117/12.857926

KEYWORDS: Charge-coupled devices, Sensors, Quantum efficiency, Gemini Observatory, Bandpass filters, Linear filtering, Adaptive optics, Telescopes, Observatories, Astronomy

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Proceedings Article | 12 July 2008 Paper

Paper

The JWST tunable filter imager (TFI)

R. Doyon, N. Rowlands, J. Hutchings, C. Evans, E. Greenberg, A. Scott, D. Touhari, M. Beaulieu, R. Abraham, L. Ferrarese, A. Fullerton, R. Jayawardhana, D. Johnston, M. R. Meyer, J. Pipher, M. Sawicki

Proceedings Volume 7010, 70100X (2008) https://doi.org/10.1117/12.789504

KEYWORDS: Coronagraphy, James Webb Space Telescope, Coating, Fabry–Perot interferometers, Imaging systems, Exoplanets, Tunable filters, Sensors, Reflectivity, Mirrors

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Proceedings Article | 9 July 2008 Paper

Paper

Optical-mechanical operation of the F2T2 filter: a tunable filter designed to search for First Light

Erin Mentuch, Alan Scott, Roberto Abraham, Elizabeth Barton, Matthew Bershady, Joss Bland-Hawthorn, David Crampton, René Doyon, Steve Eikenberry, Mike Gladders, Karl Glazebrook, Joe Jenson, Jeff Julian, Roger Julian, Jean-Paul Kneib, David Loop, Nick Raines, Neil Rowlands, J. D. Smith

Proceedings Volume 7014, 701476 (2008) https://doi.org/10.1117/12.789692

KEYWORDS: Fabry–Perot interferometers, Tunable filters, Optical filters, Calibration, Gemini Observatory, Galactic astronomy, James Webb Space Telescope, Observatories, Image filtering, Spectroscopy

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Proceedings Article | 29 June 2006 Paper

Paper

WFOS: a wide field optical spectrograph for the Thirty Meter Telescope

John Pazder, Scott Roberts, Roberto Abraham, Andre Anthony, Murray Fletcher, Tim Hardy, David Loop, Simon Sun

Proceedings Volume 6269, 62691X (2006) https://doi.org/10.1117/12.672712

KEYWORDS: Cameras, Telescopes, Spectrographs, Sensors, Diffraction gratings, Mirrors, Spectral resolution, Optical design, Imaging spectroscopy, Thirty Meter Telescope

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Proceedings Article | 27 June 2006 Paper

Paper

Performance of F2T2 tandem tunable etalon

Alan Scott, Maniyar Javed, Roberto Abraham, Steve Eikenberry, Elizabeth Barton, Matthew Bershady, Joss Bland-Hawthorn, David Crampton, Rene Doyon, Jeff Julian, Roger Julian, Jean-Paul Kneib, David Loop, Nick Raines, Neil Rowlands, J. Smith

Proceedings Volume 6269, 62695J (2006) https://doi.org/10.1117/12.668774

KEYWORDS: Fabry–Perot interferometers, Gemini Observatory, Spectral resolution, Calibration, Space telescopes, Telescopes, Control systems, Electronics, Device simulation, Digital signal processing

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Showing 5 of 17 publications

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