Mr. Victor J. Chambers Profile

Victor J. Chambers

at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 18 July 2024 Poster + Paper

Optical design of multi-field integral field unit spectrograph for the ORCAS Keck Instrument Development II (ORKID II) instrument

Bert Pasquale, Eliad Peretz, Guangjun Gao, Peter Kurczynski, Victor Chambers, Lenward Seals, Max Millar-Blanchaer, Peter Wizinowich, Marc Kassis, Peter Plavchan, Molly Adams

Proceedings Volume 13096, 1309660 (2024) https://doi.org/10.1117/12.3019837

KEYWORDS: Mirrors, Design, Spectrographs, Optical design, Spectral resolution, Optical surfaces, Optical components, Manufacturing, Iterated function systems, Optical instrument design

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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 | 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

SPIE Journal Paper | 26 December 2020 Open Access

Characterization of Nancy Grace Roman Space Telescope slitless spectrometer (grism)

Qian Gong, Matthew Bergkoetter, Joshua Berrier, Victor Chambers, Margaret Dominguez, Wesley Fincher, John Hagopian, Catherine Marx, Laurie Seide

JATIS, Vol. 6, Issue 04, 045008, (December 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.4.045008

KEYWORDS: Point spread functions, Diffraction, Spectroscopy, Sensors, Space telescopes, Calibration, Spectral resolution, Telescopes, Device simulation, Spectrographs

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Proceedings Article | 9 September 2019 Presentation

Spectral and radiometric calibration of WFIRST slitless spectrometer (grism) (Conference Presentation)

Qian Gong, Matthew Bergkoetter, Joshua Berrier, John Chambers, Margaret Dominguez, Wesley Fincher, John Hagopian, Catherine Marx

Proceedings Volume 11115, 1111503 (2019) https://doi.org/10.1117/12.2530712

KEYWORDS: Calibration, Spectral calibration, Spectroscopy, Data modeling, Optical design, Light sources, Sensors, Diffraction, Spectral resolution, Point spread functions

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Proceedings Article | 30 August 2019 Presentation + Paper

Alignment and test of the Wide Field Infrared Survey Telescope (WFIRST) Engineering Design Unit (EDU) grism

John Hagopian, Josh Berrier, John Chambers, David Content, Margaret Dominguez, Qian Gong, Jason Krom, Catherine Marx, Joseph McMann, Bert Pasquale, Laurie Seide, Arthur Whipple, Patrick Williams

Proceedings Volume 11103, 1110306 (2019) https://doi.org/10.1117/12.2530697

KEYWORDS: Wavefronts, Optical alignment, LIDAR, Chemical elements, Telescopes, Computer generated holography, Infrared telescopes, Interferometers, Optical spheres, Optical instrument design

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Proceedings Article | 27 November 2017 Paper

Optical design of the WFIRST Phase-A Integral Field Channel

Guangjun Gao, Bert Pasquale, Catherine Marx, Victor Chambers

Proceedings Volume 10590, 105901R (2017) https://doi.org/10.1117/12.2293038

KEYWORDS: Astronomical spectroscopy, Optical design, Astronomical imaging, Space telescopes, Aberration theory

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Proceedings Article | 20 October 2016 Presentation + Paper

A toolbox of metrology-based techniques for optical system alignment

Phillip Coulter, Raymond Ohl, Peter Blake, Brent Bos, Victor Chambers, William Eichhorn, Jeffrey Gum, Theodore Hadjimichael, John Hagopian, Joseph Hayden, Samuel Hetherington, David Kubalak, Kyle Mclean, Joseph McMann, Kevin Redman, Henry Sampler, Greg Wenzel, Jerrod Young

Proceedings Volume 9951, 995108 (2016) https://doi.org/10.1117/12.2239070

KEYWORDS: Optical alignment, Metrology, Optical components, James Webb Space Telescope, Mirrors, Telescopes, Lawrencium, Sensors, Spherical lenses, Optical benches

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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 | 29 July 2016 Paper

PISCES: an integral field spectrograph technology demonstration for the WFIRST coronagraph

Michael McElwain, Avi Mandell, Qian Gong, Jorge Llop-Sayson, Timothy Brandt, Victor Chambers, Bryan Grammer, Bradford Greeley, George Hilton, Marshall Perrin, Karl Stapelfeldt, Richard Demers, Hong Tang, Eric Cady

Proceedings Volume 9904, 99041A (2016) https://doi.org/10.1117/12.2231671

KEYWORDS: Spectrographs, Iterated function systems, Imaging spectroscopy, Sensors, Coronagraphy, Point spread functions, Relays, Mirrors, Prisms, Collimators

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Proceedings Article | 13 September 2012 Paper

Cryogenic photogrammetry and radiometry for the James Webb Space Telescope microshutters

Victor Chambers, Peter Morey, Barbara Zukowski, Alexander Kutyrev, Nicholas Collins, David Rapchun, Nargess Memarsadeghi, Samuel Moseley, Leroy Sparr, Peter Blake

Proceedings Volume 8450, 84501F (2012) https://doi.org/10.1117/12.924171

KEYWORDS: Camera shutters, Cryogenics, Cameras, Image registration, Infrared imaging, Image processing, James Webb Space Telescope, Visible radiation, Metrology, Image analysis

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Proceedings Article | 8 February 2011 Paper

Image registration for stability testing of MEMS

Nargess Memarsadeghi, Jacqueline Le Moigne, Peter Blake, Peter Morey, Wayne Landsman, Victor Chambers, Samuel Moseley

Proceedings Volume 7873, 78730G (2011) https://doi.org/10.1117/12.872076

KEYWORDS: Image registration, Wavelets, Microelectromechanical systems, James Webb Space Telescope, Image analysis, Astronomy, Evolutionary algorithms, Image filtering, Medical imaging, Image resolution

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Proceedings Article | 12 July 2008 Paper

Microshutter arrays: high contrast programmable field masks for JWST NIRSpec

A. Kutyrev, N. Collins, J. Chambers, S. Moseley, D. Rapchun

Proceedings Volume 7010, 70103D (2008) https://doi.org/10.1117/12.790192

KEYWORDS: Camera shutters, James Webb Space Telescope, Silicon, Electrodes, Sensors, Cryogenics, Imaging arrays, Micromirrors, Optical testing, Aluminum

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Proceedings Article | 15 September 2005 Paper

The Fourier-Kelvin Stellar Interferometer (FKSI): a progress report and preliminary results from our nulling testbed

R. Barry, W. Danchi, V. Chambers, J. Rajagopal, L. Richardson, A. Martino, D. Deming, M. Kuchner, R. Linfield, R. Millan-Gabet, L. Lee, J. Monnier, L. Mundy, C. Noecker, S. Seager, D. Wallace, R. Allen, W. Traub, H. Ford

Proceedings Volume 5905, 59050Z (2005) https://doi.org/10.1117/12.627827

KEYWORDS: Beam splitters, Planets, Interferometers, Sensors, Stars, Wavefronts, Visibility, Nulling interferometry, Mirrors, Polarization

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Proceedings Article | 25 August 2005 Paper

Cryogenic system for interferometry of high-precision optics at 20 K: design and performance

Peter Blake, Ronald Mink, John Chambers, F. Robinson, David Content, Pamela Davila

Proceedings Volume 5904, 59040S (2005) https://doi.org/10.1117/12.614160

KEYWORDS: Mirrors, Temperature metrology, Silicon carbide, Optical spheres, Interfaces, Interferometers, Kinematics, Space mirrors, Monochromatic aberrations, Interferometry

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Proceedings Article | 24 September 2004 Paper

High-accuracy surface figure measurement of silicon mirrors at 80 K

Peter Blake, Ronald Mink, John Chambers, F. Robinson, David Content, Pamela Davila

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.551738

KEYWORDS: Mirrors, Error analysis, Temperature metrology, Silicon, Liquids, Interferometers, Spherical lenses, Optical spheres, Space mirrors, Foam

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Proceedings Article | 15 October 2003 Paper

Alignment and performance of the Infrared Multi-Object Spectrometer

Joseph Connelly, Raymond Ohl, J. Mentzell, Timothy Madison, Jason Hylan, Ronald Mink, Timo Saha, June Tveekrem, Leroy Sparr, Victor Chambers, Danette Fitzgerald, Matthew Greenhouse, John MacKenty

Proceedings Volume 5172, (2003) https://doi.org/10.1117/12.503984

KEYWORDS: Mirrors, Telescopes, Sensors, Space telescopes, Infrared spectroscopy, Infrared radiation, Point spread functions, Spectroscopy, Optical alignment, Infrared imaging

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Proceedings Article | 7 March 2003 Paper

Imaging performance and modeling of the infrared multi-object spectrometer focal reducer

Joseph Connelly, Raymond Ohl, Timo Saha, Theo Hadjimichael, John Mentzell, Ronald Mink, Jason Hylan, Leroy Sparr, John Chambers, John Hagopian, Matthew Greenhouse, Robert Winsor, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458974

KEYWORDS: Mirrors, Telescopes, Space telescopes, Wavefronts, Infrared spectroscopy, Optical alignment, Spectroscopy, Sensors, Light scattering, Tolerancing

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Proceedings Article | 7 March 2003 Paper

Optical testing of diamond-machined aspheric mirrors for ground-based, near-IR astronomy

John Chambers, Ronald Mink, Raymond Ohl, Joseph Connelly, John Mentzell, Steven Arnold, Matthew Greenhouse, Robert Winsor, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458966

KEYWORDS: Mirrors, Computer generated holography, Wavefronts, Interferometers, Tolerancing, Space telescopes, Data modeling, Optical testing, Spectroscopy, Aluminum

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The Infrared Multi-Object Spectrometer (IRMOS) is a facility-class instrument for the Kitt Peak National Observatory 4 and 2.l meter telescopes. IRMOS is a near-IR (0.8-2.5 μm) spectrometer and operates at ~80 K. The 6061-T651 aluminum bench and mirrors constitute an athermal design. The instrument produces simultaneous spectra at low- to mid-resolving power (R = λ/Δλ = 300-3000) of ~100 objects in its 2.8×2.0 arcmin field. We describe ambient and cryogenic optical testing of the IRMOS mirrors across a broad range in spatial frequency (figure error, mid-frequency error, and microroughness). The mirrors include three rotationally symmetric, off-axis conic sections, one off-axis biconic, and several flat fold mirrors. The symmetric mirrors include convex and concave prolate and oblate ellipsoids. They range in aperture from 94×86 mm to 286×269 mm and in f-number from 0.9 to 2.4. The biconic mirror is concave and has a 94×76 mm aperture, R_x=377 mm, k_x=0.0778, R_y=407 mm, and k_y=0.1265 and is decentered by -2 mm in X and 227 mm in Y. All of the mirrors have an aspect ratio of approximately 6:1. The surface error fabrication tolerances are < 10 nm RMS microroughness, best effort for mid-frequency error, and < 63.3 nm RMS figure error. Ambient temperature (~293 K) testing is performed for each of the three surface error regimes, and figure testing is also performed at ~80 K. Operation of the ADE PhaseShift MicroXAM white light interferometer (micro-roughness) and the Bauer Model 200 profilometer (mid-frequency error) is described. Both the sag and conic values of the aspheric mirrors make these tests challenging. Figure testing is performed using a Zygo GPI interferometer, custom computer generated holograms (CGH), and optomechanical alignment fiducials. Cryogenic CGH null testing is discussed in detail. We discuss complications such as the change in prescription with temperature and thermal gradients. Correction for the effect of the dewar window is also covered. We discuss the error budget for the optical test and alignment procedure. Data reduction is accomplished using commercial optical design and data analysis software packages. Results from CGH testing at cryogenic temperatures are encouraging thus far.

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