Dr. Bente H. Eegholm Profile

Dr. Bente H. Eegholm

Senior Optical Engineer

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 2 October 2024 Presentation

The Nancy Grace Roman Space Telescope: observatory build, test, and verification status

Jeremy Perkins, Ed Wollack, Dave Content, Josh Abel, Joanne Baker, Lisa Bartusek, Matthew Bolcar, Bente Eegholm, Lawrence Han, Alexia Harper, Jeff Kruk, Ilya Poberezhskiy, Maxime Rizzo, Josh Schlieder, Scott Smith, Missy Vess, Neil Zimmerman

Proceedings Volume PC13131, PC1313103 (2024) https://doi.org/10.1117/12.3032499

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SPIE Journal Paper | 8 February 2024

Spectral characterization of the Grism and Prism slitless spectrometers for the Nancy Grace Roman Space Telescope

Evan Bray, Mateo Batkis, Victor J. Chambers, Margaret Dominguez, Bente Eegholm, Guangjun Gao, Qian Gong, Wesley Halliday, Elias Howe, Jeffrey Kruk, Eliot Malumuth, Sangeeta Malhotra, Catherine Marx, James Rhoads, Maxime Rizzo, Joshua E. Schlieder, Laurie Seide, Eric R. Switzer, Jay Voris

JATIS, Vol. 10, Issue 01, 014003, (February 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.1.014003

KEYWORDS: Prisms, Cameras, Linear filtering, Point spread functions, Polarization, Optical fabrication, Diffraction, Sensors, Spectral models, Diffraction gratings

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Proceedings Article | 4 October 2023 Presentation + Paper

The Roman Space Telescope optical system: status, test, and verification

Matthew Bolcar, Josh Abel, Lisa Bartusek, Tom Casey, Bente Eegholm, Guangjun Gao, Tyler Groff, John Hagopian, Joseph Howard, Alden Jurling, Gary Kuan, Dave Kubalak, Kuo-Chia (Alice) Liu, Cathy Marx, Kim Mehalick, Mark Melton, Scott Rohrbach, Derek Sabatke, Tony Whitman

Proceedings Volume 12676, 126760O (2023) https://doi.org/10.1117/12.2677569

KEYWORDS: Mirrors, Equipment, Vacuum, Optical alignment, Stray light, Optical fabrication, Metrology, Tunable filters, Telescopes, Space telescopes

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Proceedings Article | 4 October 2023 Presentation + Paper

Roman optical telescope integration status and preparation for test

Tony Whitman, Peter Miller, Joshua Abel, Bente Eegholm, Matthew Bolcar, J. Scott Smith, Brian Martens, Pete McCarthy, Joel Proebstle, Erin Schiele

Proceedings Volume 12676, 126760P (2023) https://doi.org/10.1117/12.2679201

KEYWORDS: Mirrors, Optical fabrication, Optical telescopes, Telescopes, Optical testing, Integrated optics, Wavefront sensors, Vibration, Wavefront errors, Equipment

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Proceedings Article | 3 October 2022 Poster + Paper

Spectral characterization of the RST prism assembly bandpass filters

Jessica Patel, Manuel Quijada, Bente Eegholm, Catherine Marx, Victor Chambers

Proceedings Volume 12215, 122150K (2022) https://doi.org/10.1117/12.2633404

KEYWORDS: Spectroscopy, Optical filters, Transmittance, Prisms, Bandpass filters, Coating, Spectral resolution

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Proceedings Article | 29 August 2022 Poster

Prism assembly for Roman Space Telescope Wide Field Instrument slit-less spectroscopy

Bente Eegholm, Catherine Marx, Victor Chambers, Jenny Chu, Jay Voris, Guangjun Gao, John Lehan, Laurie Seide, Bert Pasquale, John Hagopian, Peter Morey, Qian Gong, Evan Bray

Proceedings Volume 12180, 121804X (2022) https://doi.org/10.1117/12.2633674

KEYWORDS: Prisms, Space telescopes, Spectroscopes, Field spectroscopy, Spectral resolution, Optical components, Mirrors, Telescopes, Spectroscopy, Optical instrument design

Proceedings Article | 9 September 2019 Paper

Optical system design and integration of the Global Ecosystem Dynamics Investigation Lidar

Shane Wake, Luis Ramos-Izquierdo, Bente Eegholm, Peter Dogoda, Zachary Denny, Michael Hersh, Michael Mulloney, W. Joe Thomes, Melanie Ott, Hali Jakeman, Demetrios Poulios, Peter Mule, Erich de Leon, J. Bryan Blair

Proceedings Volume 11128, 111280J (2019) https://doi.org/10.1117/12.2530653

KEYWORDS: Transmitters, Receivers, Fiber optics, Sensors, Beam expanders, Optical fabrication, Optical alignment, Optical design, Collimators, Telescopes, LIDAR, Remote sensing system design, Active remote sensing, Remote sensing

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Proceedings Article | 30 August 2019 Presentation + Paper

Global Ecosystem Dynamics Investigation (GEDI) instrument alignment and test

Bente Eegholm, Shane Wake, Zachary Denny, Pete Dogoda, Demetrios Poulios, Barry Coyle, Pete Mulé, John Hagopian, Patrick Thompson, Luis Ramos-Izquierdo, Bryan Blair

Proceedings Volume 11103, 1110308 (2019) https://doi.org/10.1117/12.2532471

KEYWORDS: LIDAR, Optical metrology, Transmitters, Optical fibers, Mirrors, Optical benches, Telescopes, Collimators, Optical alignment, Receivers, Beam expanders

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Proceedings Article | 19 September 2016 Presentation + Paper

Advanced topographic laser altimeter system (ATLAS) receiver telescope assembly (RTA) and transmitter alignment and test

John Hagopian, Matthew Bolcar, John Chambers, Allen Crane, Bente Eegholm, Tyler Evans, Samuel Hetherington, Eric Mentzell, Patrick Thompson, Luis Ramos-Izquierdo, David Vaughnn

Proceedings Volume 9972, 997207 (2016) https://doi.org/10.1117/12.2240241

KEYWORDS: Space telescopes, Telescopes, Optical fibers, Receivers, Transmitters, Diffractive optical elements, Collimators, Wavefronts, Mirrors, Interferometers

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The sole instrument on NASA’s ICESat-2 spacecraft shown in Figure 1 will be the Advanced Topographic Laser Altimeter System (ATLAS)¹. The ATLAS is a Light Detection and Ranging (LIDAR) instrument; it measures the time of flight of the six transmitted laser beams to the Earth and back to determine altitude for geospatial mapping of global ice. The ATLAS laser beam is split into 6 main beams by a Diffractive Optical Element (DOE) that are reflected off of the earth and imaged by an 800 mm diameter Receiver Telescope Assembly (RTA). The RTA is composed of a 2-mirror telescope and Aft Optics Assembly (AOA) that collects and focuses the light from the 6 probe beams into 6 science fibers. Each fiber optic has a field of view on the earth that subtends 83 micro Radians. The light collected by each fiber is detected by a photomultiplier and timing related to a master clock to determine time of flight and therefore distance. The collection of the light from the 6 laser spots projected to the ground allows for dense cross track sampling to provide for slope measurements of ice fields. NASA LIDAR instruments typically utilize telescopes that are not diffraction limited since they function as a light collector rather than imaging function. The more challenging requirements of the ATLAS instrument require better performance of the telescope at the ¼ wave level to provide for improved sampling and signal to noise. NASA Goddard Space Flight Center (GSFC) contracted the build of the telescope to General Dynamics (GD). GD fabricated and tested the flight and flight spare telescope and then integrated the government supplied AOA for testing of the RTA before and after vibration qualification. The RTA was then delivered to GSFC for independent verification and testing over expected thermal vacuum conditions. The testing at GSFC included a measurement of the RTA wavefront error and encircled energy in several orientations to determine the expected zero gravity figure, encircled energy, back focal length and plate scale. In addition, the science fibers had to be aligned to within 10 micro Radians of the projected laser spots to provide adequate margin for operations on-orbit. This paper summarizes the independent testing and alignment of the fibers performed at the GSFC.

Proceedings Article | 13 September 2011 Paper

Lidar metrology for prescription characterization and alignment of large mirrors

B. Eegholm, W. Eichhorn, R. von Handorf, J. Hayden, R. Ohl, G. Wenzel

Proceedings Volume 8131, 81310I (2011) https://doi.org/10.1117/12.895012

KEYWORDS: Mirrors, Lawrencium, LIDAR, Spherical lenses, Signal detection, Metrology, Optical testing, Sensors, Optical alignment, James Webb Space Telescope

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Proceedings Article | 3 September 2010 Paper

Cryogenic metrology for the James Webb Space Telescope Integrated Science Instrument Module alignment target fixtures using laser radar through a chamber window

T. Hadjimichael, D. Kubalak, A. Slotwinski, P. Davila, B. Eegholm, W. Eichhorn, J. Hayden, E. Mentzell, R. Ohl, G. Scharfstein, R. Telfer

Proceedings Volume 7793, 77930B (2010) https://doi.org/10.1117/12.862693

KEYWORDS: Lawrencium, Cryogenics, Metrology, James Webb Space Telescope, LIDAR, Aluminum, Optical alignment, Temperature metrology, Calibration, Atmospheric modeling

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Proceedings Article | 3 September 2010 Paper

Cryogenic performance of a high precision photogrammetry system for verification of the James Webb Space Telescope Integrated Science Instrument Module and associated ground support equipment structural alignment requirements

Maria Nowak, Paul Cleveland, Emmanuel Cofie, J. Allen Crane, Pamela Davila, Bente Eegholm, Randolph Hammond, James Heaney, Jason Hylan, John Johnston, Raymond Ohl, Joseph Orndorff, Dean Osgood, Kevin Redman, Henry Sampler, Stephen Smee, Joseph Stock, Felix Threat, Robert Woodruff, Philip Young

Proceedings Volume 7793, 77930A (2010) https://doi.org/10.1117/12.862595

KEYWORDS: Cryogenics, Photogrammetry, Metrology, James Webb Space Telescope, Optical alignment, Interfaces, Cameras, Space telescopes, Optical components, Observatories

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Proceedings Article | 22 August 2009 Paper

Trades for ambient non-contact metrology

R. Ohl, B. Hoffmann Eegholm, M. Casas, B. Frey, M. Dominguez, J. Gill, J. Hayden, P. Morken, K. Redman, V. Roberts, B. Saif, T. Scirpo

Proceedings Volume 7433, 743306 (2009) https://doi.org/10.1117/12.831303

KEYWORDS: Mirrors, Lawrencium, James Webb Space Telescope, Metrology, LIDAR, Cryogenics, Space telescopes, Glasses, Composites, Optical testing

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Proceedings Article | 11 August 2008 Paper

Spatially phase-shifted digital speckle pattern interferometry (SPS-DSPI) and cryogenic structures: recent improvements

Peter Blake, Perry Greenfield, Warren Hack, J. Todd Miller, Ivo Busko, Babak Saif, Bente Eegholm, Ritva Keski-Kuha, Marcel Bluth

Proceedings Volume 7063, 706306 (2008) https://doi.org/10.1117/12.797467

KEYWORDS: James Webb Space Telescope, Speckle pattern, Phase shifts, Error analysis, Interferometers, Interferometry, Logic, Phase measurement, Temperature metrology, Cryogenics

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Proceedings Article | 12 July 2008 Paper

Development of interferometry for testing the JWST Optical Telescope Element (OTE)

Ritva Keski-Kuha, Babak Saif, Bente Eegholm, Peter Blake

Proceedings Volume 7010, 70100R (2008) https://doi.org/10.1117/12.789608

KEYWORDS: Interferometers, Mirrors, James Webb Space Telescope, Cryogenics, Space telescopes, Telescopes, Interferometry, Optical testing, Speckle pattern, Motion measurement

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Proceedings Article | 20 September 2007 Paper

Development of electronic speckle pattern interferometry for testing JWST composite structures

Babak Saif, Marcel Bluth, Bente Eegholm, Perry Greenfield, Warren Hack, Ritva Keski-Kuha, Peter Blake

Proceedings Volume 6687, 668704 (2007) https://doi.org/10.1117/12.734859

KEYWORDS: James Webb Space Telescope, Interferometers, Cryogenics, Mirrors, Temperature metrology, Speckle pattern, Calibration, Composites, Space telescopes, Interferometry

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Proceedings Article | 12 September 2007 Paper

Technology demonstration of large stable cryogenic composite structures for JWST

Charles Atkinson, Jonathan Arenberg, Larry Gilman, Ted Messer, Patty May, Dave Moon, Kevin Patton, Jim York, Stan Backovsky, Jim Tucker, Marcel Bluth, Babak Saif, Ritva Keski-Kuha, Jeff Kegley, Bente Eegholm

Proceedings Volume 6687, 668703 (2007) https://doi.org/10.1117/12.734753

KEYWORDS: Curium, James Webb Space Telescope, Cryogenics, Composites, Temperature metrology, Space telescopes, Mirrors, Manufacturing, Metrology, Analytical research

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Proceedings Article | 13 June 2006 Paper

The JWST backplane stability test article: a critical technology demonstration

Jonathan Arenberg, Larry Gilman, Nick Abbruzze, Justin Reuter, Kristen Anderson, Jas Jahic, Joseph Yacoub, Hector Padilla, Charles Atkinson, Dave Moon, Kevin Patton, Patty May, Jim York, Ted Messer, Stan Backovsky, Jim Tucker, Chris Harvey, Bente Eegholm, Barbara Zukowski, Peter Blake

Proceedings Volume 6265, 62650Q (2006) https://doi.org/10.1117/12.671714

KEYWORDS: Distortion, James Webb Space Telescope, Manufacturing, Magnetism, Temperature metrology, Composites, 3D modeling, Aluminum, Space telescopes, Metrology

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Showing 5 of 18 publications

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