Dr. Gopal Vasudevan Profile

Dr. Gopal Vasudevan

Sr. Staff Scientist at Lockheed Martin Space Systems Co

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 31 August 2022 Presentation + Paper

Presentation + Paper

The Polstar high resolution spectropolarimetry MIDEX mission

Paul Scowen, Richard Ignace, Ken Gayley, Gopal Vasudevan, Robert Woodruff, Coralie Neiner, Scott Richardson, Alison Nordt, Tony Hull, Shouleh Nikzad, Charles Shapiro

Proceedings Volume 12181, 1218106 (2022) https://doi.org/10.1117/12.2630103

KEYWORDS: Stars, Polarization, Polarimetry, Ultraviolet radiation, Staring arrays, Calibration, Mirrors, Spectroscopy, Spectral resolution, Modulators

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

Optical design of LUVIS for a SMEX mission

Robert Woodruff, Stephen Kendrick, Tony Hull, Daewook Kim, Gopal Vasudevan, Sara Heap

Proceedings Volume 12181, 121812R (2022) https://doi.org/10.1117/12.2629549

KEYWORDS: Sensors, Spectroscopy, Diffraction gratings, Optical design, Mirrors, Microchannel plates, Calibration, Monochromatic aberrations, Space operations, Ultraviolet radiation

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Proceedings Article | 31 August 2022 Presentation + Paper

Presentation + Paper

Design drivers for the Polstar spectropolarimeter: an FUV/NUV design achieving high spectral resolving power with precise 4-Stokes measurements

Robert Woodruff, Coralie Neiner, Roberto Casini, Gopal Vasudevan, Tony Hull, Paul Scowen

Proceedings Volume 12181, 121810C (2022) https://doi.org/10.1117/12.2629556

KEYWORDS: Polarization, Mirrors, Staring arrays, Wave plates, Prisms, Calibration, Spectroscopy, Spectral resolution, Sensors, Stars

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

Calibration approach for the Polstar spectropolarimeter

Gopal Vasudevan, Robert Woodruff, Kirstin Doney, Coralie Neiner, Roberto Casini, Mark Sullivan, Paul Scowen, Tony Hull, Alison Nordt

Proceedings Volume 12181, 1218139 (2022) https://doi.org/10.1117/12.2630553

KEYWORDS: Calibration, Mirrors, Polarization, Spectral calibration, Prisms, Telescopes, Modulators, Spectroscopy, Lamps, Polarimetry

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

LUVIS: an ultraviolet SMEX mission optimized for the Lyman UV

Stephen Kendrick, Robert Woodruff, Tony Hull, Daewook Kim, Gopal Vasudevan, Sara Heap

Proceedings Volume 12181, 121812W (2022) https://doi.org/10.1117/12.2629641

KEYWORDS: Ultraviolet radiation, Sensors, Microchannel plates, Galactic astronomy, Optical coatings, Optical design, Spectrographs, Mirrors, Telescopes

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Proceedings Article | 24 August 2021 Presentation + Paper

Presentation + Paper

Design drivers for the PolStar telescope and UV spectropolarimeter instrument

Matthew Gilbertson, R. Woodruff, Alyssa Ruiz, Mark Sullivan, Gopal Vasudevan, Ken Lorell, Ariana Reyes, Kirstin Doney, Larry Sokolsky, Tony Hull, Paul Scowen, Alison Nordt

Proceedings Volume 11820, 118200G (2021) https://doi.org/10.1117/12.2594798

KEYWORDS: Mirrors, Telescopes, Polarization, Staring arrays, Optical instrument design, Modulators, Spectral resolution, Prisms, Stars, Sensors

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Proceedings Article | 20 August 2021 Presentation + Paper

Presentation + Paper

The Polstar High Resolution Spectropolarimetry MIDEX Mission

Paul Scowen, Ken Gayley, Coralie Neiner, Gopal Vasudevan, Robert Woodruff, Richard Ignace, Roberto Casini, Tony Hull, Alison Nordt, H. Philip Stahl

Proceedings Volume 11819, 1181908 (2021) https://doi.org/10.1117/12.2594267

KEYWORDS: Polarization, Stars, Mirrors, Spectral resolution, Polarimetry, Prisms, Calibration, Wave plates, Ultraviolet radiation, Staring arrays

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The Polstar mission will provide for a space-borne 60cm telescope operating at UV wavelengths with spectropolarimetric capability capturing all four Stokes parameters (intensity, two linear polarization components, and circular polarization). Polstar’s capabilities are designed to meet its goal of determining how circumstellar gas flows alter massive stars' evolution, and finding the consequences for the stellar remnant population and the stirring and enrichment of the interstellar medium, by addressing four key science objectives. In addition, Polstar will determine drivers for the alignment of the smallest interstellar grains, and probe the dust, magnetic fields, and environments in the hot diffuse interstellar medium, including for the first time a direct measurement of the polarized and energized properties of intergalactic dust. Polstar will also characterize processes that lead to the assembly of exoplanetary systems and that affect exoplanetary atmospheres and habitability. Science driven design requirements include: access to ultraviolet bands: where hot massive stars are brightest and circumstellar opacity is highest; high spectral resolution: accessing diagnostics of circumstellar gas flows and stellar composition in the far-UV at 122-200nm, including the NV, SiIV, and CIV resonance doublets and other transitions such as NIV, AlIII, HeII, and CIII; polarimetry: accessing diagnostics of circumstellar magnetic field shape and strength when combined with high FUV spectral resolution and diagnostics of stellar rotation and distribution of circumstellar gas when combined with low near-UV spectral resolution; sufficient signal-to-noise ratios: ~103 for spectropolarimetric precisions of 0.1% per exposure; ~102 for detailed spectroscopic studies; ~10 for exploring dimmer sources; and cadence: ranging from 1-10 minutes for most wind variability studies, to hours for sampling rotational phase, to days or weeks for sampling orbital phase. The ISM and exoplanet science program will be enabled by these capabilities driven by the massive star science.

Proceedings Article | 12 July 2019 Open Access

Open Access

Paper

Design and on-orbit calibration of the solar ultraviolet imager (SUVI) on the GOES-R series weather satellite

Gopal Vasudevan, Lawrence Shing, Dnyanesh Mathur, Christopher Edwards, Margaret Shaw, Daniel Seaton, Jonathan Darnel

Proceedings Volume 11180, 111807P (2019) https://doi.org/10.1117/12.2536196

KEYWORDS: Calibration, Image filtering, Extreme ultraviolet, Space operations, Solar processes, Imaging systems, Iron, Mirrors, Telescopes, Optical filters

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Proceedings Article | 29 September 2011 Paper

Paper

NIRCam coronagraphic Lyot stop: design, fabrication, and testing

Yalan Mao, Torben Andersen, Tracy Kubo, Miguel Virgen, Henry Chan, Greg Feller, Lynn Huff, Eric Smith, Gopal Vasudevan, Steve Somerstein, Tom Jamieson, Scott Horner, John Krist, Charles Beichman, Carmen Barone, Ron Schmidt, Donna Levin, Steve Seymour, Douglas Kelly, Marcia Rieke

Proceedings Volume 8150, 81500E (2011) https://doi.org/10.1117/12.896451

KEYWORDS: Coronagraphy, Point spread functions, James Webb Space Telescope, Absorbance, Optical filters, Image filtering, Ferroelectric LCDs, Staring arrays, Coating, Silicon

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Proceedings Article | 6 August 2010 Paper

Paper

Visible nulling coronagraphy testbed development for exoplanet detection

Richard Lyon, Mark Clampin, Robert Woodruff, Gopal Vasudevan, Patrick Thompson, Andrew Chen, Peter Petrone, Andrew Booth, Timothy Madison, Matthew Bolcar, M. Charley Noecker, Stephen Kendrick, Gary Melnick, Volker Tolls

Proceedings Volume 7731, 77312B (2010) https://doi.org/10.1117/12.857472

KEYWORDS: Wavefronts, Coronagraphy, Nulling interferometry, Beam splitters, Planets, Space telescopes, Cameras, Algorithm development, Telescopes, Reflectivity

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Proceedings Article | 6 August 2010 Paper

Paper

Optical design of dilute aperture visible nulling coronagraph imaging (DAViNCI)

Robert Woodruff, Michael Shao, B. Martin Levine, Richard Lyon, Gopal Vasudevan, Jun Acu, Keith Havey, Jeff Wynn

Proceedings Volume 7731, 77312A (2010) https://doi.org/10.1117/12.857711

KEYWORDS: Telescopes, Spectrometers, Imaging systems, Mirrors, Space telescopes, Staring arrays, Prisms, Planets, Interferometers, Nulling interferometry

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Proceedings Article | 18 September 2009 Paper

Paper

Athermalized embedding of actuators in cryogenic mirrors

Craig Hom, Gopal Vasudevan, Mark Sullivan, B. Martin Levine

Proceedings Volume 7439, 743911 (2009) https://doi.org/10.1117/12.826650

KEYWORDS: Actuators, Mirrors, Cryogenics, Ferroelectric materials, Silicon carbide, Distortion, Tungsten, Manufacturing, Temperature metrology, Deformable mirrors

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Proceedings Article | 26 August 2009 Paper

Paper

Visible nulling coronagraph testbed results

Richard Lyon, Mark Clampin, Robert Woodruff, Gopal Vasudevan, Patrick Thompson, Peter Petrone, Timothy Madison, Maxime Rizzo, Gary Melnick, Volker Tolls

Proceedings Volume 7440, 744011 (2009) https://doi.org/10.1117/12.827423

KEYWORDS: Planets, Coronagraphy, Nulling interferometry, Algorithm development, Image segmentation, Visible radiation, Optical filters, Phase shifts, Stars, Point spread functions

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Proceedings Article | 20 August 2009 Paper

Paper

Balloon exoplanet nulling interferometer (BENI)

Richard Lyon, Mark Clampin, Robert Woodruff, Gopal Vasudevan, Holland Ford, Larry Petro, Jay Herman, Stephen Rinehart, Kenneth Carpenter, Joe Marzouk

Proceedings Volume 7440, 74401A (2009) https://doi.org/10.1117/12.827411

KEYWORDS: Planets, Interferometers, Telescopes, Stars, Digital signal processing, Sensors, Exoplanets, Mirrors, Wavefronts, Cameras

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Proceedings Article | 20 August 2009 Paper

Paper

The JWST/NIRCam coronagraph: mask design and fabrication

John Krist, Kunjithapatham Balasubramanian, Charles Beichman, Pierre Echternach, Joseph Green, Kurt Liewer, Richard Muller, Eugene Serabyn, Stuart Shaklan, John Trauger, Daniel Wilson, Scott Horner, Yalan Mao, Stephen Somerstein, Gopal Vasudevan, Douglas Kelly, Marcia Rieke

Proceedings Volume 7440, 74400W (2009) https://doi.org/10.1117/12.826448

KEYWORDS: Coronagraphy, James Webb Space Telescope, Stars, Halftones, Telescopes, Diffraction, Coating, Photomasks, Sapphire, Light scattering

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Proceedings Article | 28 July 2008 Paper

Paper

DAVINCI, a diluter aperture visible nulling coronagraphic instrument

M. Shao, S. Bairstow, B. Martin Levine, Gautam Vasisht, Benjamin Lane, Gopal Vasudevan, Robert Woodruff, Rocco Samuele, Jeffrey Wynn, Mark Clampin, Richard Lyon, Olivier Guyon

Proceedings Volume 7013, 70132T (2008) https://doi.org/10.1117/12.789767

KEYWORDS: Stars, Telescopes, Planets, Coronagraphy, Space telescopes, Interferometers, Nulling interferometry, Space operations, Oxygen, Jupiter

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Proceedings Article | 15 July 2008 Paper

Paper

Disaggregation of Preisach hysteresis model and nonlinear function least-squares fit

Dragos Maciuca, Gopal Vasudevan

Proceedings Volume 7015, 70156V (2008) https://doi.org/10.1117/12.786934

KEYWORDS: Systems modeling, Actuators, Deformable mirrors, Algorithm development, Adaptive optics, Mathematical modeling, Switches, Complex systems, Light sources, Relays

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Proceedings Article | 12 July 2008 Paper

Paper

Precision attitude determination for an infrared space telescope

Dominic Benford, Tod Lauer, Robert Woodruff, Roel van Bezooijen, Gopal Vasudevan

Proceedings Volume 7010, 70104A (2008) https://doi.org/10.1117/12.789919

KEYWORDS: Stars, Infrared telescopes, Space telescopes, Point spread functions, Device simulation, Motion measurement, Cameras, Monte Carlo methods, Charge-coupled devices, Infrared radiation

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Proceedings Article | 12 July 2008 Paper

Paper

Extrasolar Planetary Imaging Coronagraph (EPIC): visible nulling cornagraph testbed results

Richard Lyon, Mark Clampin, Gary Melnick, Volker Tolls, Robert Woodruff, Gopal Vasudevan

Proceedings Volume 7010, 701045 (2008) https://doi.org/10.1117/12.789700

KEYWORDS: Planets, Coronagraphy, Nulling interferometry, Wavefronts, Beam splitters, Interferometers, Point spread functions, Space telescopes, Telescopes, Phase shifts

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Proceedings Article | 15 June 2006 Paper

Paper

Study of coronagraphic techniques

Volker Tolls, Michael Aziz, Robert Gonsalves, Sylvain Korzennik, Antoine Labeyrie, Richard Lyon, Gary Melnick, Ruth Schlitz, Steve Somerstein, Gopal Vasudevan, Robert Woodruff

Proceedings Volume 6265, 62653K (2006) https://doi.org/10.1117/12.672647

KEYWORDS: Coronagraphy, Manufacturing, Speckle, Sensors, Scanners, Absorbance, Microelectromechanical systems, Beam propagation method, Observatories, Ion beams

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Proceedings Article | 5 October 2005 Paper

Paper

Study of high-performance coronagraphic techniques

Volker Tolls, Michael Aziz, Robert Gonsalves, Sylvain Korzennik, Antoine Labeyrie, Richard Lyon, Gary Melnick, Steve Somerstein, Gopal Vasudevan, Robert Woodruff

Proceedings Volume 5905, 59051M (2005) https://doi.org/10.1117/12.639422

KEYWORDS: Speckle, Coronagraphy, Photomasks, Manufacturing, Planets, Mirrors, Spherical lenses, Ion beams, Wavefronts, Device simulation

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Proceedings Article | 25 August 2005 Paper

Paper

NIRCam integration and test

David Mason, Paul Schweiger, Gopal Vasudevan

Proceedings Volume 5904, 59040E (2005) https://doi.org/10.1117/12.615404

KEYWORDS: Control systems, Optical alignment, James Webb Space Telescope, Electronics, Optical fabrication, Mirrors, Staring arrays, Metrology, Optical filters, Sensors

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Proceedings Article | 25 August 2005 Paper

Paper

Some performance results from NIRCam’s coronagraphic prototype masks

Gopal Vasudevan, Martina Reale, Stephen Somerstein

Proceedings Volume 5904, 590408 (2005) https://doi.org/10.1117/12.617813

KEYWORDS: Coronagraphy, James Webb Space Telescope, Prototyping, Binary data, Beam propagation method, Cameras, Observatories, Wave propagation, Near infrared, Space operations

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Proceedings Article | 12 October 2004 Paper

Paper

A pupil plane technique for sensing and correcting large phase aberrations

Gopal Vasudevan, Robert Reardon

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551977

KEYWORDS: Actuators, Mirrors, Collimation, James Webb Space Telescope, Space telescopes, Near field, Cameras, Wavefronts, Telescopes, Segmented mirrors

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Proceedings Article | 5 March 2003 Paper

Paper

Coarse phasing of segmented mirrors using a dispersed fringe sensor

Eric Smith, Gopal Vasudevan, Robert Reardon, Robert Bernier, Kenneth Triebes

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461577

KEYWORDS: Segmented mirrors, Wavefronts, Sensors, Actuators, Prisms, Metrology, Refractive index, Optical filters, Error analysis, Fringe analysis

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Proceedings Article | 5 March 2003 Paper

Paper

Noniterative methodology for obtaining a wavefront directly from phase diversity measurements

Barbara Landesman, Gopal Vasudevan, Eric Smith

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461560

KEYWORDS: Wavefronts, Point spread functions, Phase retrieval, Phase measurement, Space telescopes, Telescopes, Fourier transforms, Optical transfer functions, Imaging systems, Image segmentation

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Proceedings Article | 5 March 2003 Paper

Paper

Point-by-point approach to phase-diverse phase retrieval

Lawton Lee, Gopal Vasudevan, Eric Smith

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461564

KEYWORDS: Wavefronts, Error analysis, Image segmentation, Wavefront sensors, Point spread functions, Phase retrieval, Monte Carlo methods, Statistical analysis, Computer simulations, Space telescopes

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Showing 5 of 27 publications

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