Dr. Tobias Feger Profile

Dr. Tobias Feger

R&D Engineer at Redback Systems

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 7 October 2022 Paper

Paper

The SDSS-V local volume mapper fibre cable assembly and metrology

Tobias Feger, Ellen Houston, Yevgen Kripak, Ross Zhelem, Timothy Chin, David Adams, Scott Case, David Robertson, Jon Lawrence, Tom Herbst, Pavan Bilgi, Nicholas Konidaris, Leon Aslan, Guillermo Blanc, Stefanie Wachter, Solange Ramírez, Niv Drory, Juna Kollmeier, Cynthia Froning

Proceedings Volume 12184, 121846Q (2022) https://doi.org/10.1117/12.2629083

KEYWORDS: Spectrographs, Metrology, Tolerancing, Telescopes, Inspection, Surface finishing, Polishing, Interfaces, Observatories, Assembly tolerances

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Construction, testing, and commissioning of the SDSS-V Local Volume Mapper telescope system

T. Herbst, Peter Bizenberger, Guillermo Blanc, Florian Briegel, Scott Case, Niv Drory, Tobias Feger, Cynthia Froning, Wolfgang Gaessler, Maximilian Häberle, Anthony Hebert, Juna Kollmeier, Nicholas Konidaris, Markus Kuhlberg, Alicia Lanz, Richard Mathar, Lars Mohr, Soojong Pak, Solange Ramírez, Christopher Ritz, Ralf-Rainer Rohloff, José Sánchez-Gallego, Paula Stępień, Stefanie Wachter, Ross Zhelem, Dmitry Bizyaev

Proceedings Volume 12182, 121821Q (2022) https://doi.org/10.1117/12.2629354

KEYWORDS: Telescopes, Silver, Optical benches, Mirrors, Objectives, Cameras, Calibration, Microscopes, Staring arrays, Spectrographs

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Proceedings Article | 14 December 2020 Poster + Presentation

Poster + Presentation

The SDSS-V local volume mapper fiber cable system

Tobias Feger, Scott Case, Ross Zhelem, Yevgen Kripak, Jon Lawrence, Christian Schwab, Tom Herbst, Guillermo Blanc, Pavan Bilgi, Nicholas Konidaris, Anthony Hebert, Stefanie Wachter, Solange Ramirez, Niv Drory, Cynthia Froning

Proceedings Volume 11447, 114478N (2020) https://doi.org/10.1117/12.2562185

KEYWORDS: Calibration, Spectroscopy, Telescopes, Spectrographs, Stars, Solar system, Lanthanum, Observatories, Optical instrument design, Staring arrays

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

SDSS-V local volume mapper instrument: overview and status

Nicholas Konidaris, Niv Drory, Cynthia Froning, Anthony Hebert, Pavan Bilgi, Guillermo Blanc, Alicia Lanz, Charles Hull, Juna Kollmeier, Solange Ramirez, Stefanie Wachter, Kathryn Kreckel, Soojong Pak, Eric Pellegrini, Andrés Almeida, Scott Case, Ross Zhelem, Tobas Feger, Jon Lawrence, Michael Lesser, Tom Herbst, José Sanchez-Gallego, Matthew Bershady, Sabyasachi Chattopadhyay, Andrew Hauser, Michael Smith, Marsha Wolf, Renbin Yan

Proceedings Volume 11447, 1144718 (2020) https://doi.org/10.1117/12.2557565

KEYWORDS: Telescopes, Spectrographs, Spectroscopes, Stars, Solar system, Lanthanum, Observatories, Clouds, Spectral resolution, Atmospheric sciences

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Keck Planet Finder: design updates

Steven Gibson, Andrew Howard, Kodi Rider, Arpita Roy, Jerry Edelstein, Marc Kassis, Jason Grillo, Sam Halverson, Martin Sirk, Christopher Smith, Steve Allen, Ashley Baker, Charles Beichman, Bruce Berriman, Thomas Brown, Kelleen Casey, Jason Chin, David Coutts, David Cowley, William Deich, Tobias Feger, Benjamin Fulton, Luke Gers, Yulia Gurevich, Yuzo Ishikawa, Ean James, Sharon Jelinsky, Stephen Kaye, Kyle Lanclos, Adela Li, Scott Lilley, Ben McCarney, Tim Miller, Steve Milner, Timothy O'Hanlon, Jacob Pember, Mike Raffanti, Constance Rockosi, Ryan Rubenzahl, Dave Rumph, Dale Sandford, Maureen Savage, Christian Schwab, Andreas Seifahrt, Abby Shaum, Roger Smith, Julian Stuermer, Jim Thorne, Adam Vandenberg, Tod Von Boeckmann, Cindy Wang, Qifan Wang, Marie Weisfeiler, Mavourneen Wilcox, Edward Wishnow, Peter Wizinowich, Truman Wold, Anna Wolfenberger

Proceedings Volume 11447, 1144742 (2020) https://doi.org/10.1117/12.2561783

KEYWORDS: Planets, Spectroscopy, Keck Observatory, Exoplanets, Doppler effect, Optical fabrication, Zerodur, Optical benches, Charge-coupled devices, CCD image sensors

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

IRANTI: a compact flexible configuration infrared échelle spectrograph integrating emerging technologies for precise radial velocity measurements

Blaise Kuo Tiong, Christian Schwab, Tobias Feger, Theodoros Anagnos, Jacob Pember, Surangkhana Rukdee, Leonardo Vanzi, David Coutts

Proceedings Volume 11447, 114474H (2020) https://doi.org/10.1117/12.2561352

KEYWORDS: Spectrographs, New and emerging technologies, Velocity measurements, Single mode fibers, Adaptive optics, Near infrared, Cameras, Sensors, Optical design, Relays

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

The SDSS-V local volume mapper telescope system

T. Herbst, Pavaman Bilgi, Peter Bizenberger, Guillermo Blanc, Florian Briegel, Scott Case, Niv Drory, Tobias Feger, Cynthia Froning, Wolfgang Gaessler, Anthony Hebert, Nicholas Konidaris, Alicia Lanz, Lars Mohr, Soojong Pak, Solange Ramírez, Ralf-Rainer Rohloff, José Sánchez-Gallego, Stefanie Wachter

Proceedings Volume 11445, 114450J (2020) https://doi.org/10.1117/12.2561419

KEYWORDS: Telescopes, Calibration, Spectrographs, Lanthanum, Spatial resolution, Optical instrument design, Observatories, Spectral resolution, Galactic astronomy, Sun

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The Sloan Digital Sky Survey V (SDSS-V) is an all-sky spectroscopic survey of <6 million objects, designed to decode the history of the Milky Way, reveal the inner workings of stars, investigate the origin of solar systems, and track the growth of supermassive black holes across the Universe. The Local Volume Mapper (LVM) is one of three surveys that form SDSS-V. LVM will employ a coordinated system of four telescopes feeding three fiber spectrographs at Las Campanas Observatory in Chile. The goal is to map approximately 2500 square degrees of the Galactic plane over the wavelength range 360-980 nm with R~4000 spectral resolution. These observations will reveal for the first time how distinct gaseous environments within the Galaxy interact with each other and with the stellar population, producing the large-scale interstellar medium that we observe. Accurately mapping and calibrating a substantial portion of the sky at this spatial resolution requires a unique type of telescope system. Each of the four LVM telescopes has a diameter of 16 cm, making them considerably smaller and lighter than the instruments they feed. One telescope will host the science IFU containing ~1800 fibers arranged in a close-packed hexagon. Two additional Calibration telescopes will observe fields adjacent to the science IFU, in order to calibrate out terrestrial airglow and other geo-coronal emission. The fourth, Spectrophotometric telescope will make rapid observations of bright stars (typically 12 during a single IFU / Calibration exposure) to correct for telluric absorption lines and overall extinction. The fibers from all three types of telescope will be interspersed in the entrance slits of the spectrographs, allowing for simultaneous science and calibration exposures. Although considerably smaller than the next generation of giants, the LVM telescopes must also operate close to the limits of physical optics, and the geometry and scope of the LVM survey present unique challenges. For example, with this type of telescope at the Las Campanas site, the effects of optical aberrations, diffraction, seeing, and (uncorrected) atmospheric dispersion are all of comparable scale. This, coupled with the need for repeated and reliable measurements over years, leads to some unconventional design choices. This paper presents the preliminary design of the LVM telescope system and discusses the requirements and tradeoffs that led to the baseline choices.

Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

An innovative integral field unit upgrade with 3D-printed micro-lenses for the RHEA at Subaru

Theodoros Anagnos, Pascal Maier, Philipp Hottinger, Christopher Betters, Tobias Feger, Sergio Leon-Saval, Itandehui Gris-Sánchez, Stephanos Yerolatsitis, Julien Lozi, Tim Birks, Sébastien Vievard, Nemanja Jovanovic, Adam Rains, Michael Ireland, Robert Harris, Blaise Kuo Tiong, Olivier Guyon, Barnaby Norris, Sebastiaan Haffert, Matthias Blaicher, Yulin Xu, Moritz Straub, Jörg-Uwe Pott, Oliver Sawodny, Philip Neureuther, David Coutts, Christian Schwab, Christian Koos, Andreas Quirrenbach

Proceedings Volume 11451, 114516Y (2020) https://doi.org/10.1117/12.2560626

KEYWORDS: Spectrographs, Adaptive optics, Free space optics, Large telescopes, Optical instrument design, Diffraction, Spectral resolution, Free space, Lenses, Exoplanets

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Proceedings Article | 3 January 2020 Paper

Paper

Rubidium transitions as wavelength reference for astronomical Doppler spectrographs

D. Rogozin, T. Feger, C. Schwab, Y. Gurevich, G. Raskin, D. Coutts, J. Stuermer, A. Seifahrt, T. Fuehrer, T. Legero, H. Van Winckel, S. Halverson, A. Quirrenbach

Proceedings Volume 11203, 112031N (2020) https://doi.org/10.1117/12.2541317

KEYWORDS: Rubidium, Fabry–Perot interferometers, Calibration, Astronomy, Spectrographs, Doppler effect, Spectroscopy, Absorption, Spectral calibration, Absorption spectroscopy

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Proceedings Article | 9 July 2018 Paper

Paper

Developing an ultra-stable single mode fiber spectrograph for adaptive optics assisted observation in the infrared

Blaise Kuo Tiong, Christian Schwab, Tobias Feger, Surangkhana Rukdee, Leonardo Vanzi, David Coutts

Proceedings Volume 10702, 107025T (2018) https://doi.org/10.1117/12.2309435

KEYWORDS: Spectrographs, Sensors, Cameras, Mirrors, Computer aided design, Single mode fibers, Adaptive optics, Astronomy, Optical design, Infrared detectors

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Proceedings Article | 9 July 2018 Paper

Paper

Rubidium traced etalon wavelength calibrators: towards deployment at observatories

Christian Schwab, Tobias Feger, Julian Stürmer, Andreas Seifahrt, Yulia Gurevich, Dmytro Rogozin, Thorsten Führer, Samuel Halverson, Ryan Terrien, Thomas Legero, David Coutts, Gert Raskin, Thomas Walther, Jacob Bean, Andreas Quirrenbach

Proceedings Volume 10702, 1070272 (2018) https://doi.org/10.1117/12.2314426

KEYWORDS: Fabry–Perot interferometers, Rubidium, Calibration, Observatories, Spectroscopy, Spectrographs, Spectral calibration, Optical coatings

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Proceedings Article | 9 July 2018 Paper

Paper

The RHEA single-mode spectrograph

Tobias Feger, Christian Schwab, Blaise Kuo Tiong, Michael Ireland, Adam Rains, David Coutts

Proceedings Volume 10702, 1070253 (2018) https://doi.org/10.1117/12.2313170

KEYWORDS: Spectrographs, Sensors, CMOS sensors, Single mode fibers, Cameras, Quantum efficiency, Collimators, Prisms, Computer aided design, Astronomy

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Proceedings Article | 6 July 2018 Paper

Paper

Development of the single-mode fiber integral field unit for the RHEA Spectrograph

Adam Rains, Michael Ireland, Nemanja Jovanovic, Joao Bento, Tobias Feger, Julien Lozi, Christian Schwab, David Coutts, Olivier Guyon, Alexander Arriola, Simon Gross, Jonathan Harris

Proceedings Volume 10702, 107025J (2018) https://doi.org/10.1117/12.2314336

KEYWORDS: Spectrographs, Single mode fibers, Optical alignment, Microlens array, Astronomy, Astronomical instrumentation

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Proceedings Article | 6 July 2018 Paper

Paper

A high resolution echelle spectrograph for exoplanet searches with small aperture telescopes

Nathan Lentini, Blaise Kuo Tiong, Logan DuBois, Tobias Feger, David Coutts, Cassandra Fallscheer, Christian Schwab

Proceedings Volume 10702, 107026I (2018) https://doi.org/10.1117/12.2313065

KEYWORDS: Spectrographs, Collimators, Stars, Telescopes, Exoplanets, Mirrors, Finite element methods, Planets, Doppler effect, Optics manufacturing

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Proceedings Article | 6 July 2018 Paper

Paper

Keck Planet Finder: preliminary design

Steven Gibson, Andrew Howard, Arpita Roy, Christopher Smith, Sam Halverson, Jerry Edelstein, Marc Kassis, Edward Wishnow, Michael Raffanti, Steve Allen, Jason Chin, David Coutts, David Cowley, Jim Curtis, William Deich, Tobias Feger, Daniel Finstad, Yulia Gurevich, Yuzo Ishikawa, Ean James, Elisha Jhoti, Kyle Lanclos, Scott Lilley, Tim Miller, Steve Milner, Tom Payne, Kodi Rider, Constance Rockosi, Dale Sandford, Christian Schwab, Andreas Seifahrt, Martin Sirk, Roger Smith, Julian Stuermer, Marie Weisfeiler, Mavourneen Wilcox, Adam Vandenberg, Peter Wizinowich

Proceedings Volume 10702, 107025X (2018) https://doi.org/10.1117/12.2311565

KEYWORDS: Spectroscopy, Calibration, Planets, Zerodur, Doppler effect

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Proceedings Article | 9 August 2016 Paper

Paper

Precision single mode fibre integral field spectroscopy with the RHEA spectrograph

Adam Rains, Michael Ireland, Nemanja Jovanovic, Tobias Feger, Joao Bento, Christian Schwab, David Coutts, Olivier Guyon, Alexander Arriola, Simon Gross

Proceedings Volume 9908, 990876 (2016) https://doi.org/10.1117/12.2233743

KEYWORDS: Spectrographs, Telescopes, Calibration, Adaptive optics, Spectrographs, Single mode fibers, Stars, Spectral resolution, Astronomy, Spatial resolution, Microlens array

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Proceedings Article | 9 August 2016 Paper

Paper

Performance and future developments of the RHEA single-mode spectrograph

Joao Bento, Tobias Feger, Michael Ireland, Adam Rains, Nemanja Jovanovic, David Coutts, Christian Schwab, Alexander Arriola , Simon Gross

Proceedings Volume 9908, 99086K (2016) https://doi.org/10.1117/12.2232371

KEYWORDS: Spectrographs, Telescopes, Robotics, Optical design, Prisms, Prototyping, Stars, Calibration, Observatories, Astronomy

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Proceedings Article | 26 July 2016 Paper

Paper

The SCExAO high contrast imager: transitioning from commissioning to science

N. Jovanovic, O. Guyon, J. Lozi, T. Currie, J. Hagelberg, B. Norris, G. Singh, P. Pathak, D. Doughty, S. Goebel, J. Males, J. Kuhn, E. Serabyn, P. Tuthill, G. Schworer, F. Martinache, T. Kudo, H. Kawahara, T. Kotani, M. Ireland, T. Feger, A. Rains, J. Bento, C. Schwab, D. Coutts, N. Cvetojevic, S. Gross, A. Arriola, T. Lagadec, J. Kasdin, T. Groff, B. Mazin, Y. Minowa, N. Takato, M. Tamura, H. Takami, M. Hayashi

Proceedings Volume 9909, 99090W (2016) https://doi.org/10.1117/12.2234294

KEYWORDS: Adaptive optics, Imaging systems, Stars, Telescopes, Calibration, Visible radiation, Spectrographs, Speckle, Cameras, Prisms

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Proceedings Article | 22 July 2016 Paper

Paper

Adaptive optics fed single-mode spectrograph for high-precision Doppler measurements in the near-infrared

C. Schwab, N. Jovanovic, T. Feger, M. Bakovic, Y. Gurevich, J. Stürmer, R. Apodaca, L. Vanzi, S. Rukdee, J. Lawrence, D. Coutts, N. Cvetojevic, S. Mahadevan, G. Stefánsson, S. Halverson, O. Guyon

Proceedings Volume 9912, 991274 (2016) https://doi.org/10.1117/12.2234407

KEYWORDS: Spectrographs, Adaptive optics, Doppler effect, Optical design, Spectrographs, Single mode fibers, Cameras, Mirrors, Telescopes, Point spread functions, Sensors

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Proceedings Article | 5 August 2014 Paper

Paper

A stable and inexpensive wavelength reference for precise wavelength calibration of radial velocity spectrographs

Tobias Feger, Michael Ireland, Joao Bento, Carlos Bacigalupo

Proceedings Volume 9147, 914780 (2014) https://doi.org/10.1117/12.2055674

KEYWORDS: Spectrographs, Interferometers, Single mode fibers, Calibration, Lamps, Mach-Zehnder interferometers, Visibility, Thermal optics, Modulators, Refractive index

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Proceedings Article | 28 July 2014 Paper

Paper

RHEA: the ultra-compact replicable high-resolution exoplanet and Asteroseismology spectrograph

Tobias Feger, Carlos Bacigalupo, Timothy Bedding, Joao Bento, David Coutts, Michael Ireland, Quentin Parker, Aaron Rizzuto, Izabela Spaleniak

Proceedings Volume 9147, 91477I (2014) https://doi.org/10.1117/12.2055600

KEYWORDS: Spectrographs, Sensors, Single mode fibers, Telescopes, Point spread functions, Calibration, Charge-coupled devices, Prisms, Exoplanets, Observatories

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Proceedings Article | 5 October 2012 Paper

Paper

Pressure and temperature stabilization of an existing Echelle spectrograph III

Anna Brucalassi, Tobias Feger, Frank Grupp, Florian Lang-Bardl, Shao Ming Hu, Ulrich Hopp, Ralf Bender

Proceedings Volume 8446, 84462F (2012) https://doi.org/10.1117/12.925621

KEYWORDS: Spectrographs, Temperature metrology, Observatories, Telescopes, Spectroscopy, Charge-coupled devices, Planets, CCD image sensors, Photovoltaics, Prisms

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Proceedings Article | 24 September 2012 Paper

Paper

A testbed for simultaneous measurement of fiber near and far-field for the evaluation of fiber scrambling properties

Tobias Feger, Anna Brucalassi, Frank Grupp, Florian Lang-Bardl, Ronald Holzwarth, Ulrich Hopp, Ralf Bender

Proceedings Volume 8446, 844692 (2012) https://doi.org/10.1117/12.925624

KEYWORDS: Optical fibers, Cladding, Telescopes, Light emitting diodes, Spectrographs, Visible radiation, CCD cameras, Light, Observatories, Doppler effect

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Showing 5 of 23 publications

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