Mr. Stefan Ulrich Profile

Stefan Ulrich

Mechanical Engineer at Lab for Atmospheric and Space Physics

SPIE Involvement:

Author

Publications (11)

SPIE Journal Paper | 4 April 2024

Far- and Lyman-ultraviolet imaging demonstrator: a rocket-borne pathfinder instrument for high efficiency ultraviolet band selection imaging

Nicholas Nell, Nicholas Kruczek, Kevin France, Stefan Ulrich, Patrick Behr, Emily Farr

JATIS, Vol. 10, Issue 02, 024001, (April 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.2.024001

KEYWORDS: Mirrors, Equipment, Telescopes, Sensors, Microchannel plates, Ultraviolet radiation, Point spread functions, Optical coatings, Galactic astronomy, Design

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Proceedings Article | 9 November 2023 Presentation + Paper

Lyman-ultraviolet imaging filter development for the FLUID rocket payload

Emily Farr, Nicholas Kruczek, Kevin France, Nicholas Nell, Patrick Behr, Stefan Ulrich, Juan Larruquert, Carlos Honrado-Benítez, Paloma López-Reyes

Proceedings Volume 12678, 126780T (2023) https://doi.org/10.1117/12.2677932

KEYWORDS: Tunable filters, Rockets, Image filtering, Optical filters, Galactic astronomy, Far ultraviolet, Ultraviolet radiation, Telescopes, Copper, Spatial resolution

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We present laboratory reflectivity results of two novel optical filters designed for the Lyman ultraviolet bandpass (LUV; 90-120 nm) and the far ultraviolet bandpass (FUV; 120-150 nm). These filters were developed in coordination with the Grupo de Óptica de Láminas Delgadas (GOLD) at the Instituto de Óptica-Consejo Superior de Investigaciones Cientìficas for the Far- and Lyman-Ultraviolet Imaging Demonstrator (FLUID) sounding rocket payload. In addition to maturing high priority band-selecting UV filter technology, FLUID will measure the LUV and far ultraviolet (FUV; 120-200 nm) morphologies of nearby galaxies in four imaging bands to provide local analogs for JWST observations of high redshift galaxies. Images in the LUV will be used to make the first ever morphological classifications of local galaxies in this bandpass. FLUID comprises four f /28.7 Cassegrain telescopes with ⪅3 arcsecond angular resolution over a 20 arcminute wide field-of-view. Each telescope receives a unique band-defining filter covering the LUV through FUV (approximately 15 nm FWHM band centered on 105 nm, and 20 nm FWHM bands centered on 140 nm, 160 nm, or 180 nm). These filters are multilayer reflectance filters, and were developed by GOLD in collaboration with CU Boulder. Evaluation of the F140M filter and the Lyman alpha (Ly-α; 121.6 nm) suppressing F110M filter witness samples, as well as the secondary and primary mirrors, were completed with optical testing facilities at both GOLD and CU. We present the measured efficiencies of the F110M optics, which all demonstrate reflectivites ⪅3% at Ly-α while maintaining ⪆40% reflectivity at 105 nm, and the F140M optics, which show show peak reflectivities for 140 nm greater than 87%. These values are used to estimate the performance of the FLUID instrument in this band. Additionally we will conduct further testing of all four filters, as well as testing age and environmental stability of the filters over the course of the project.

Proceedings Article | 5 October 2023 Presentation + Paper

Status and mission operations of the SPRITE 12U CubeSat: a probe of star formation feedback from stellar to galactic scales with far-UV imaging spectroscopy

Briana Indahl, Brian Fleming, Dmitry Vorobiev, Dana Chafetz, Jack Williams, Maitland Bowen, Diane Brening, Sanchayeeta Borthakur, Javier Del Hoyo, Destry Dewitt, Adriana Diaz, Abigail Durell, Ben Foehr, Kevin France, Sreejith Gopinathan, John Hennessy, Anne Jaskot, Michael Kaiser, Sydney Koehler, Adam Magruder, Adrian Martin, Stephan McCandliss, John O'Meara, Manuel Quijada, Luis Rodríguez-de Marcos, Michael Rotkowski, Ravi Sankrit, Alex Sico, Oswald Siegmund, Daniel Szewczyk, Jason Tumlinson, Stefan Ulrich

Proceedings Volume 12678, 1267806 (2023) https://doi.org/10.1117/12.2677737

KEYWORDS: Astronomical spectroscopy, Equipment, Stars, Galactic astronomy, Microchannel plates, Space operations, Ultraviolet radiation, Calibration, Telescopes, Protective coatings, Mirrors

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Proceedings Article | 5 October 2023 Presentation + Paper

FLUID: a rocket-borne pathfinder instrument for high efficiency UV band selection imaging

Nicholas Nell, Nicholas Kruczek, Kevin France, Stefan Ulrich, Patrick Behr, Emily Farr

Proceedings Volume 12678, 1267807 (2023) https://doi.org/10.1117/12.2677781

KEYWORDS: Mirrors, Telescopes, Microchannel plates, Ultraviolet radiation, Galactic astronomy, Charge-coupled devices, Rockets, Optical coatings, Design and modelling

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Proceedings Article | 5 October 2023 Presentation + Paper

The SISTINE-3 sounding rocket payload: calibration and in-flight performance

Patrick Behr, Nicholas Nell, Nicholas Kruczek, Stefan Ulrich, Kevin France, Brian Fleming

Proceedings Volume 12678, 1267805 (2023) https://doi.org/10.1117/12.2676920

KEYWORDS: Far ultraviolet, Stars, Ultraviolet radiation, Microchannel plates, Silicon, Exoplanets, Spectrographs, Rockets, Mirrors, Telescopes

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Proceedings Article | 24 August 2021 Poster + Paper

Development and characterization of the CCD detector for the Colorado Ultraviolet Transit Experiment (CUTE) cubesat

Nicholas Nell, Nicholas DeCicco, Stefan Ulrich, Kevin France, Brian Fleming

Proceedings Volume 11821, 1182117 (2021) https://doi.org/10.1117/12.2594743

KEYWORDS: Charge-coupled devices, Electronics, Clocks, Analog electronics, Quantum efficiency, Sensors, CCD image sensors, Amplifiers, Calibration, Switches

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Proceedings Article | 13 December 2020 Presentation + Paper

Optical characterization of the Colorado Ultraviolet Transit Experiment (CUTE) CubeSat

Arika Egan, Kevin France, Brian Fleming, Nicholas DeCicco, Stefan Ulrich, Nicholas Nell, Dmitry Vorobiev, Richard Kohnert, Ambily Suresh

Proceedings Volume 11444, 1144406 (2020) https://doi.org/10.1117/12.2559983

KEYWORDS: Calibration, Ultraviolet radiation, Telescopes, Space operations, Atmospheric modeling, Atmospheric sciences, Exoplanets, Near ultraviolet, Spectroscopes, Mirrors

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Proceedings Article | 9 September 2019 Paper

High-sensitivity far-ultraviolet imaging spectroscopy with the SPRITE Cubesat

Brian Fleming, Kevin France, Jack Williams, Stefan Ulrich, Jason Tumlinson, Stephan McCandliss, John O'Meara, Ravi Sankrit, Sanchayeeta Borthakur, Anne Jaskot, Michael Rutkowski, Manuel Quijada, John Hennessy, Oswald Siegmund

Proceedings Volume 11118, 111180U (2019) https://doi.org/10.1117/12.2529512

KEYWORDS: Sensors, Galactic astronomy, Microchannel plates, Calibration, Stars, Signal to noise ratio, Mirrors, Telescopes, Space operations, Ultraviolet radiation

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Proceedings Article | 6 July 2018 Presentation + Paper

The Colorado ultraviolet transit experiment (CUTE): final design and projected performance

Arika Egan, Brian Fleming, Kevin France, Nicholas Nell, Stefan Ulrich, Nicholas DeCicco, Richard Kohnert, A. G. Sreegith, Luca Fossati, Nicholas Kruczek

Proceedings Volume 10699, 106990C (2018) https://doi.org/10.1117/12.2309990

KEYWORDS: Space operations, Space telescopes, Telescopes, Exoplanets, Spectrographs, Aluminum, Ultraviolet radiation, Atmospheric monitoring

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Proceedings Article | 6 July 2018 Presentation + Paper

The fourth flight of CHESS: spectral resolution enhancements for high-resolution FUV spectroscopy

Nicholas Kruczek, Nicholas Nell, Kevin France, Keri Hoadley, Brian Fleming, Stefan Ulrich, Alexander Miller, Arika Egan, Emily Witt, Robert Kane

Proceedings Volume 10699, 106990K (2018) https://doi.org/10.1117/12.2312877

KEYWORDS: Calibration, Spectral resolution, Microchannel plates, Spectrographs, Reflectivity

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Proceedings Article | 29 August 2017 Paper

The third flight of the Colorado high-resolution echelle stellar spectrograph (CHESS): improvements, calibrations, and preliminary results

Nicholas Kruczek, Nicholas Nell, Kevin France, Keri Hoadley, Brian Fleming, Robert Kane, Stefan Ulrich, Arika Egan, Dawson Beatty

Proceedings Volume 10397, 103971G (2017) https://doi.org/10.1117/12.2274834

KEYWORDS: Spectrographs, Calibration, Spectral calibration, Rockets, Astrophysics, Hardware testing, Far ultraviolet

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Showing 5 of 11 publications

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