Dr. Daniel J. Ryan Profile

Dr. Daniel J. Ryan

at Jet Propulsion Lab

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 27 August 2022 Presentation + Paper

Nancy Grace Roman Space Telescope coronagraph instrument observation calibration plan

Robert Zellem, Bijan Nemati, Guillermo Gonzalez, Marie Ygouf, Vanessa Bailey, Eric Cady, M. Mark Colavita, Sergi Hildebrandt, Erin Maier, Bertrand Mennesson, Lindsey Payne, Neil Zimmerman, Ruslan Belikov, Robert De Rosa, John Debes, Ewan Douglas, Julien Girard, Tyler Groff, Jeremy Kasdin, Patrick Lowrance, Bruce Macintosh, Daniel Ryan, Carey Weisberg

Proceedings Volume 12180, 121801Z (2022) https://doi.org/10.1117/12.2627567

KEYWORDS: Calibration, Stars, Coronagraphy, Planets, Sensors, Polarization, Point spread functions, Error analysis, Signal to noise ratio, Uranus

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Proceedings Article | 11 October 2017 Presentation

Ultra low reflectivity black silicon surfaces and devices enable unique optical applications (Conference Presentation)

Karl Yee, Victor White, Kunjithapatham Balasubramanian, Daniel Ryan

Proceedings Volume 10354, 103540W (2017) https://doi.org/10.1117/12.2274409

KEYWORDS: Reflectivity, Silicon, Spectroscopy, Nanofabrication, Antireflective coatings, Optical components, Visible radiation, Astronomy, Nanotechnology, Infrared radiation

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Proceedings Article | 12 September 2017 Presentation + Paper

Fabrication of coronagraph masks and laboratory scale star-shade masks: characteristics, defects, and performance

Kunjithapatham Balasubramanian, A. J. Eldorado Riggs, Eric Cady, Victor White, Karl Yee, Daniel Wilson, Pierre Echternach, Richard Muller, Camilo Mejia Prada, Byoung-Joon Seo, Fang Shi, Daniel Ryan, Santos Fregoso, Jacob Metzman, Robert Casey Wilson

Proceedings Volume 10400, 104000C (2017) https://doi.org/10.1117/12.2274059

KEYWORDS: Photomasks, Exoplanets, Electron beam lithography, Silicon, Stars, Reflectivity, Wavefronts, Performance modeling, Polarimetry

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Proceedings Article | 22 July 2016 Paper

Design and construction of a 76m long-travel laser enclosure for a space occulter testbed

Michael Galvin, Yunjong Kim, N. Jeremy Kasdin, Dan Sirbu, Robert Vanderbei, Dan Echeverri, Giuseppe Sagolla, Andreas Rousing, Kunjithapatham Balasubramanian, Daniel Ryan, Stuart Shaklan, Doug Lisman

Proceedings Volume 9912, 99126N (2016) https://doi.org/10.1117/12.2231093

KEYWORDS: Space telescopes, Cameras, Switches, Laser safety, Reflectivity, Stray light, Sensors, Telescopes, Laser systems engineering, Aluminum

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SPIE Journal Paper | 7 December 2015

WFIRST-AFTA coronagraph shaped pupil masks: design, fabrication, and characterization

Kunjithapatham Balasubramanian, Victor White, Karl Yee, Pierre Echternach, Richard Muller, Matthew Dickie, Eric Cady, Camilo Prada, Daniel Ryan, Ilya Poberezhskiy, Brian Kern, Hanying Zhou, John Krist, Bijan Nemati, A. J. Eldorado Riggs, Neil Zimmerman, N. Jeremy Kasdin

JATIS, Vol. 2, Issue 01, 011005, (December 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.2.1.011005

KEYWORDS: Photomasks, Silicon, Coronagraphy, Reflectivity, Semiconducting wafers, Aluminum, Point spread functions, Wavefronts, Optical instrument design, Etching

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Proceedings Article | 5 October 2015 Presentation

Nanofabrication of ultra-low reflectivity black silicon surfaces and devices (Presentation Recording)

Victor White, Karl Yee, Kunjithapatham Balasubramanian, Pierre Echternach, Richard Muller, Matthew Dickie, Eric Cady, Daniel Ryan, Michael Eastwood, Byron van Gorp, A. J. Eldorado Riggs, Niel Zimmerman, N. Jeremy Kasdin

Proceedings Volume 9556, 955609 (2015) https://doi.org/10.1117/12.2189216

KEYWORDS: Reflectivity, Nanofabrication, Silicon, Optical components, Visible radiation, Coronagraphy, Spectrometers, Aerospace engineering, Nanotechnology, Infrared radiation

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Proceedings Article | 16 September 2015 Paper

Laboratory performance of the shaped pupil coronagraphic architecture for the WFIRST/AFTA coronagraph

Eric Cady, Camilo Mejia Prada, Xin An, Kunjithapatham Balasubramanian, Rosemary Diaz, N. Jeremy Kasdin, Brian Kern, Andreas Kuhnert, Bijan Nemati, Keith Patterson, Ilya Poberezhskiy, A. J. Eldorado Riggs, Daniel Ryan, Hanying Zhou, Robert Zimmer, Neil Zimmerman

Proceedings Volume 9605, 96050B (2015) https://doi.org/10.1117/12.2189113

KEYWORDS: Coronagraphy, Photomasks, Telescopes, Point spread functions, Microscopes, Infrared telescopes, Silicon, Binary data, Infrared radiation, Stars

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Proceedings Article | 16 September 2015 Paper

Exoplanet coronagraph shaped pupil masks and laboratory scale star shade masks: design, fabrication and characterization

Kunjithapatham Balasubramanian, Victor White, Karl Yee, Pierre Echternach, Richard Muller, Matthew Dickie, Eric Cady, Camilo Mejia Prada, Daniel Ryan, Ilya Poberezhskiy, Hanying Zhou, Brian Kern, A. J. Riggs, Neil Zimmerman, Dan Sirbu, Stuart Shaklan, Jeremy Kasdin

Proceedings Volume 9605, 96050L (2015) https://doi.org/10.1117/12.2188954

KEYWORDS: Photomasks, Silicon, Reflectivity, Aluminum, Coronagraphy, Semiconducting wafers, Stars, Wavefronts, Point spread functions, Telescopes

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Proceedings Article | 2 August 2014 Paper

Technology development towards WFIRST-AFTA coronagraph

Ilya Poberezhskiy, Feng Zhao, Xin An, Kunjithapatham Balasubramanian, Ruslan Belikov, Eric Cady, Richard Demers, Rosemary Diaz, Qian Gong, Brian Gordon, Renaud Goullioud, Frank Greer, Olivier Guyon, Michael Hoenk, N. Jeremy Kasdin, Brian Kern, John Krist, Andreas Kuhnert, Michael McElwain, Bertrand Mennesson, Dwight Moody, Richard Muller, Bijan Nemati, Keith Patterson, A. J. Riggs, Daniel Ryan, Byoung-Joon Seo, Stuart Shaklan, Erkin Sidick, Fang Shi, Nicholas Siegler, Rémi Soummer, Hong Tang, John Trauger, J. Kent Wallace, Xu Wang, Victor White, Daniel Wilson, Karl Yee, Hanying Zhou, Neil Zimmerman

Proceedings Volume 9143, 91430P (2014) https://doi.org/10.1117/12.2060320

KEYWORDS: Coronagraphy, Sensors, Wavefronts, Wavefront sensors, Iterated function systems, Photomasks, Space telescopes, Exoplanets, Deformable mirrors, Planets

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Proceedings Article | 2 September 2008 Paper

Broadband white light laser combiner system

Daniel Ryan, Alireza Azizi, Xin An, Hong Tang, Richard Demers

Proceedings Volume 7056, 705623 (2008) https://doi.org/10.1117/12.804262

KEYWORDS: Light, Cameras, Multimode fibers, Calibration, Light sources, Mirrors, Fiber lasers, Photonic crystal fibers, Single mode fibers, Visible radiation

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Proceedings Article | 28 July 2008 Paper

Spectral calibration at the picometer level on SCDU (spectral calibration development unit)

Richard Demers, Xin An, Alireza Azizi, Gary Brack, Oliver Lay, Daniel Ryan, Janice Shen, George Sun, Hong Tang, Chengxing Zhai

Proceedings Volume 7013, 70132H (2008) https://doi.org/10.1117/12.790653

KEYWORDS: Spectral calibration, Metrology, Calibration, Wavefronts, Stars, Beam splitters, Servomechanisms, Mirrors, Optical filters, Interferometers

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Proceedings Article | 14 August 2006 Paper

Measurement of the non-common vertex error of a double corner cube

Alireza Azizi, Martin Marcin, Douglas Moore, Steve Moser, John Negron, Eung-Gi Paek, Daniel Ryan, Alex Abramovici, Paul Best, Ian Crossfield, Bijan Nemati, Tim Neville, B. Platt, Leonard Wayne

Proceedings Volume 6292, 629203 (2006) https://doi.org/10.1117/12.696088

KEYWORDS: Metrology, Prisms, Motion measurement, Interferometers, Interferometry, Beam splitters, Autocollimators, Data modeling, Heterodyning, Laser metrology

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Proceedings Article | 20 October 2004 Paper

Kite: status of the external metrology testbed for SIM

Frank Dekens, Oscar Alvarez-Salazar, Alireza Azizi, Steven Moser, Bijan Nemati, John Negron, Timothy Neville, Daniel Ryan

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.549797

KEYWORDS: Metrology, Stars, Data modeling, Interferometers, Heterodyning, Space operations, Motion measurement, Switches, Bragg cells, Sensors

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Showing 5 of 13 publications

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