Dr. Ritva A. Keski-Kuha Profile

Dr. Ritva A. Keski-Kuha

Engineer at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (58)

Proceedings Article | 24 August 2024 Presentation

Picometer-level metrology of test articles on the road to Habitable Worlds Observatory

Breann Sitarski, Babak Saif, Marcel Bluth, Peter Petrone, Perry Greenfield, Lee Feinberg, Sang Park, Michael Eisenhower, Thomas Zielinski, Ritva Keski-Kuha, Theodore Hadjimichael, Stephen Hagopian

Proceedings Volume 13092, 130921R (2024) https://doi.org/10.1117/12.3018843

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Proceedings Article | 23 August 2024 Presentation + Paper

LISA telescope development status and flight design

Ritva Keski-Kuha, Ryan Derosa, Kevin Boyce, Theodore Hadjimichael, Joseph Howard, Joseph Ivanov, Timothy Johnson, Joshua Lutter, Jonathan Papa, Shannon Sankar, Andrew Weaver

Proceedings Volume 13092, 130922C (2024) https://doi.org/10.1117/12.3019158

KEYWORDS: Wavefront errors, Design, Engineering, Telescopes, Mirrors, Optical fabrication, Optical benches, Optical alignment, Space operations

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SPIE Journal Paper | 15 November 2023 Open Access

James Webb Space Telescope optical stability lessons learned for future great observatories

Lee Feinberg, Michael McElwain, Charles Bowers, John Johnston, Gary Mosier, Randy Kimble, Joshua Levi, Lightsey, Ball Aerospace, Boulder, Colorado, United States, J. Knight, Marcel Bluth, Alden Jurling, Marie Levine, D. Scott Acton, Charles Atkinson, Allison Barto, Matthew Bergkoetter, Gregory Brady, Larkin Carey, Lester Cohen, Laura Coyle, Bruce Dean, Michael Eisenhower, Nicolas Flagey, George Hartig, Keith Havey, Brian Hicks, Joseph Howard, Ritva Keski-Kuha, Charles-Philippe Lajoie, Matthew Lallo, Gary Matthews, Marcio Meléndez, Michael Menzel, Sang Park, Marshall Perrin, Laurent Pueyo, Lisbeth Quesnel, Paul Reynolds, Jane Rigby, Babak Saif, Christopher Stark, Randal Telfer, Scott Texter, Julie Van Campen, Begona Vila, Garrett West, Erin Wolf, Tony Whitman, Thomas Zielinski

JATIS, Vol. 10, Issue 01, 011204, (November 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.10.1.011204

KEYWORDS: James Webb Space Telescope, Telescopes, Inspection, Online learning, Observatories, Thermal stability, Temperature metrology, Design, Cryogenics, Interfaces

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Proceedings Article | 27 August 2022 Presentation + Paper

Ultra-stable structures lab (USS)

Lee Feinberg, Babak Saif, A. Marcel Bluth, Perry Greenfield, Sang Park, Peter Petrone, Ritva Keski-Kuha, Alden Jurling, Chuck Bowers

Proceedings Volume 12180, 121802M (2022) https://doi.org/10.1117/12.2626490

KEYWORDS: Telescopes, Mirrors, Metrology, Data modeling, Interferometers, Calibration, Control systems, Space telescopes, James Webb Space Telescope, Temperature metrology

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Proceedings Article | 27 August 2022 Presentation + Paper

Phasing the Webb Telescope

D. Scott Acton, Scott Knight, Maria Carrasquilla, Nick Weiser, Michaela Masciarelli, Sarah Jurczyk, Greg Rapp, Julio Mueckay, Erin Wolf, Jess Murphy, Larkin Carey, Eric Coppock, Chanda Walker, Joel Runnels, Garrett West, Greg Wirth, Brian Hicks, Katie Melbourne, Michael Gordon, Bob Brown, Stefano Grimaldi, Derek Sabatke, Ray Wright, Laura Coyle, Taylor Chonis, Kevin Whiteaker, Marshall Perrin, Tom Comeau, Charles-Philippe Lajoie, George Hartig, Tracy Beck, Matt Lallo, Mike Regan, Randal Telfer, Marcio Meléndez, Greg Brady, Laurent Pueyo, Nicolas Flagey, Bernard Kulp, Ed Nelan, Kiera Brooks, Pierre Chayer, Shannon Osborne, Sherie Holfeltz, Tony Sohn, Tom Zielinski, Alden Jurling, Matt Bergkoetter, Chuck Bowers, Bruce Dean, Lee Feinberg, Ritva Keski-Kuha, Jeff Kirk, Michael McElwain, Joe Howard

Proceedings Volume 12180, 121800U (2022) https://doi.org/10.1117/12.2633474

KEYWORDS: Actuators, Telescopes, Mirrors, Sensors, Image processing, Wavefronts, Phase retrieval, James Webb Space Telescope

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Proceedings Article | 27 August 2022 Presentation + Paper

Commissioning the James Webb Space Telescope optical telescope element

Lee Feinberg, Erin Wolf, Scott Acton, Scott Knight, Matthew Lallo, Marshall Perrin, Paul Reynolds, Joseph Howard, Alden Jurling, Ritva Keski-Kuha, Tom Zielinski

Proceedings Volume 12180, 121800T (2022) https://doi.org/10.1117/12.2628626

KEYWORDS: Actuators, Optical components, Observatories, Telescopes, Mirrors, Image segmentation, Wavefronts, Optical alignment, Optical telescopes, James Webb Space Telescope

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Proceedings Article | 9 September 2021 Open Access

High-speed interferometry for James Webb Space Telescope testing

B. Saif, L. Feinberg, R. Keski-Kuha

Proceedings Volume 11813, 118130U (2021) https://doi.org/10.1117/12.2570872

KEYWORDS: Monochromatic aberrations, Telescopes, Mirrors, Metrology, Interferometers, Composites, Interferometry, Optical alignment, James Webb Space Telescope, Cryogenics

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Proceedings Article | 9 September 2019 Paper

Picometer level spatial metrology for next generation telescopes

Babak Saif, Ritva Keski-Kuha, Perry Greenfield, Michael North-Morris, Marcel Bluth, Lee Feinberg, J. Wyant, S. Park

Proceedings Volume 11115, 111150K (2019) https://doi.org/10.1117/12.2543034

KEYWORDS: Telescopes, Mirrors, Metrology, Interferometers, Wavefronts, Speckle pattern, Optical alignment, Space observatories, High speed electronics, Mirror structures

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Proceedings Article | 6 July 2018 Paper

JWST optical telescope element center of curvature test

Babak Saif, Ritva Keski-Kuha, David Chaney, Perry Greenfield, Kyle Van Gorkom, Keira Brooks, Warren Hack, Marcel Bluth, Josh Bluth, James Sanders, Koby Smith, Larkin Carey, Sze Chaung, Lee Feinberg, Severine Tournois, W. Scott Smith, Vladimir Kradinov

Proceedings Volume 10698, 106983M (2018) https://doi.org/10.1117/12.2313029

KEYWORDS: Monochromatic aberrations, Telescopes, Mirrors, Interferometers, Optical fabrication, Optical testing, Computer generated holography, Space telescopes, Optical alignment, James Webb Space Telescope

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Proceedings Article | 5 September 2017 Presentation + Paper

JWST center of curvature test method and results

Babak Saif, David Chaney, Perry Greenfield, Kyle Van Gorkom, Keira Brooks, Warren Hack, Marcel Bluth, Josh Bluth, James Sanders, Koby Smith, Larkin Carey, Sze Chaung, Ritva Keski-Kuha, Lee Feinberg, Severine Tournois, W. Scott Smith, Vladimir Kradinov

Proceedings Volume 10401, 104010T (2017) https://doi.org/10.1117/12.2273974

KEYWORDS: Optical components, Telescopes, Mirrors, Metrology, Optical fabrication equipment, Interferometers, Optical fabrication, Space telescopes, Optical telescopes, James Webb Space Telescope

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Proceedings Article | 29 July 2016 Paper

JWST telescope integration and test progress

Gary Matthews, Tony Whitman, Lee Feinberg, Mark Voyton, Juli Lander, Ritva Keski-Kuha

Proceedings Volume 9904, 990404 (2016) https://doi.org/10.1117/12.2232040

KEYWORDS: Telescopes, Mirrors, Light emitting diodes, Sensors, Adaptive optics, Optical testing, Optical testing, Space telescopes, Neodymium, James Webb Space Telescope, Cryogenics

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Proceedings Article | 29 July 2016 Paper

Status of the JWST optical telescope element

Charlie Atkinson, Scott Texter, Ritva Keski-Kuha, Lee Feinberg

Proceedings Volume 9904, 990403 (2016) https://doi.org/10.1117/12.2232649

KEYWORDS: Optical components, Observatories, Mirrors, Adaptive optics, Optical fabrication, Optical alignment, Optical telescopes, James Webb Space Telescope, Cryogenics, Shape memory alloys

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Proceedings Article | 29 July 2016 Paper

James Webb Space Telescope optical telescope element/integrated science instrument module (OTIS) status

Lee Feinberg, Mark Voyon, Juli Lander, Ritva Keski-Kuha, Gary Matthews

Proceedings Volume 9904, 990407 (2016) https://doi.org/10.1117/12.2231453

KEYWORDS: Telescopes, Mirrors, Adaptive optics, Optical testing, Space telescopes, Integrated optics, Optical telescopes, Acoustics, James Webb Space Telescope, Cryogenics

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Proceedings Article | 31 August 2015 Paper

JWST pathfinder telescope risk reduction cryo test program

Gary Matthews, Thomas Scorse, John Spina, Darin Noël, Keith Havey, Jesse Huguet, Tony Whitman, Conrad Wells, Chanda Walker, Sharon Lunt, James Hadaway, Ritva Keski-Kuha, Lee Feinberg, Mark Voyton, Juli Lander, James Marsh

Proceedings Volume 9575, 957505 (2015) https://doi.org/10.1117/12.2188793

KEYWORDS: Telescopes, Mirrors, Adaptive optics, Image analysis, Optical fabrication, Optical testing, Photogrammetry, Space telescopes, Optical isolators, James Webb Space Telescope

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Proceedings Article | 27 August 2015 Paper

JWST pathfinder telescope integration

Gary Matthews, Scott Kennard, Ronald Broccolo, James Ellis, Elizabeth Daly, Walter Hahn, John Amon, Stephen Mt. Pleasant, Scott Texter, Charles Atkinson, Andrew McKay, Joshua Levi, Ritva Keski-Kuha, Lee Feinberg

Proceedings Volume 9575, 957504 (2015) https://doi.org/10.1117/12.2188780

KEYWORDS: Telescopes, Mirrors, Interfaces, Adaptive optics, Optical testing, Space telescopes, Optical alignment, James Webb Space Telescope, Shape memory alloys, Liquids

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Proceedings Article | 2 August 2014 Paper

JWST telescope integration and test status

Gary Matthews, Thomas Scorse, Scott Kennard, John Spina, Tony Whitman, Scott Texter, Charles Atkinson, Greg Young, Ritva Keski-Kuha, James Marsh, Juli Lander, Lee Feinberg

Proceedings Volume 9143, 914305 (2014) https://doi.org/10.1117/12.2055286

KEYWORDS: Telescopes, Mirrors, Phase modulation, Ions, Optical fabrication, Space telescopes, Integrated optics, Neodymium, Infrared telescopes, James Webb Space Telescope

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Proceedings Article | 2 August 2014 Paper

James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Pathfinder status and plans

Lee Feinberg, Ritva Keski-Kuha, Charlie Atkinson, Andrew Booth, Tony Whitman

Proceedings Volume 9143, 91430E (2014) https://doi.org/10.1117/12.2054782

KEYWORDS: Mirrors, Phase modulation, Adaptive optics, Optical fabrication, Optical testing, Photogrammetry, Space telescopes, Optical alignment, James Webb Space Telescope, Cryogenics

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Proceedings Article | 2 August 2014 Paper

New method for characterizing the state of optical and opto-mechanical systems

Babak Saif, Ritva Keski-Kuha, Lee Feinberg, David Chaney, Marcel Bluth, Perry Greenfield, Warren Hack, Scott Smith, James Sanders

Proceedings Volume 9143, 91430C (2014) https://doi.org/10.1117/12.2055243

KEYWORDS: Monochromatic aberrations, Telescopes, Mirrors, Metrology, Interferometers, Data acquisition, Computer generated holography, Space telescopes, Neodymium, James Webb Space Telescope

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Proceedings Article | 2 August 2014 Paper

Status of the JWST optical telescope element

Charlie Atkinson, Scott Texter, Ritva Keski-Kuha, Lee Feinberg

Proceedings Volume 9143, 914303 (2014) https://doi.org/10.1117/12.2055546

KEYWORDS: Optical components, Mirrors, Electronics, Adaptive optics, Optical fabrication, Optical telescopes, Stray light control, James Webb Space Telescope, Cryogenics, Shape memory alloys

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Proceedings Article | 21 September 2012 Paper

Status of the JWST optical telescope element

Charlie Atkinson, Scott Texter, Ritva Keski-Kuha, Lee Feinberg

Proceedings Volume 8442, 84422E (2012) https://doi.org/10.1117/12.927594

KEYWORDS: Actuators, Optical components, Mirrors, Electronics, Composites, Optical fabrication, Optical telescopes, James Webb Space Telescope, Cryogenics, Shape memory alloys

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Proceedings Article | 21 September 2012 Paper

James Webb Space Telescope optical telescope element mirror development history and results

Lee Feinberg, Mark Clampin, Ritva Keski-Kuha, Charlie Atkinson, Scott Texter, Mark Bergeland, Benjamin Gallagher

Proceedings Volume 8442, 84422B (2012) https://doi.org/10.1117/12.924271

KEYWORDS: Optical components, Mirrors, Polishing, Aerospace engineering, Space telescopes, Optical telescopes, Beryllium, James Webb Space Telescope, Cryogenics, Off axis mirrors

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Proceedings Article | 21 September 2012 Paper

James Webb Space Telescope optical telescope element mirror coatings

Ritva Keski-Kuha, Charles Bowers, Manuel Quijada, James Heaney, Benjamin Gallagher, Andrew McKay, Ian Stevenson

Proceedings Volume 8442, 84422J (2012) https://doi.org/10.1117/12.925470

KEYWORDS: Gold, Optical components, Telescopes, Mirrors, Optical coatings, Reflectivity, Space telescopes, Beryllium, James Webb Space Telescope, Cryogenics

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SPIE Journal Paper | 6 February 2012

Space telescope design considerations

Lee Feinberg, Bruce Dean, William Hayden, Joseph Howard, Ritva Keski-Kuha, Lester Cohen

OE, Vol. 51, Issue 1, 011006, (February 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.1.011006

KEYWORDS: Space telescopes, Telescopes, Optical instrument design, Mirrors, James Webb Space Telescope, Optical coatings, Image segmentation, Optics manufacturing, Stray light, Monochromatic aberrations

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Proceedings Article | 11 August 2010 Paper

Use of a pathfinder optical telescope element for James Webb Space Telescope risk mitigation

Lee Feinberg, Ritva Keski-Kuha, Charlie Atkinson, Scott Texter

Proceedings Volume 7731, 77313T (2010) https://doi.org/10.1117/12.855800

KEYWORDS: Optical components, Phase modulation, Adaptive optics, Optical testing, Photogrammetry, Optical alignment, Optical telescopes, James Webb Space Telescope, Cryogenics, Shape memory alloys

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Proceedings Article | 5 August 2010 Paper

Results, status, and plans for the James Webb Space Telescope optical telescope element

Lee Feinberg, Ritva Keski-Kuha, Charlie Atkinson, Scott Texter

Proceedings Volume 7731, 77310A (2010) https://doi.org/10.1117/12.855796

KEYWORDS: Optical components, Telescopes, Mirrors, Polishing, Optical fabrication, Space telescopes, Optical telescopes, Optical instrument design, James Webb Space Telescope, Cryogenics

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Proceedings Article | 5 May 2010 Paper

Image processing for alignment of aspheric optics without fiducials

Babak Saif, Perry Greenfield, Warren Hack, Ritva Keski-Kuha, Lee Feinberg, David Chaney

Proceedings Volume 7723, 772309 (2010) https://doi.org/10.1117/12.853992

KEYWORDS: Monochromatic aberrations, Mirrors, Phase modulation, Image segmentation, Image processing, Computer generated holography, Space telescopes, Image filtering, Optical alignment, James Webb Space Telescope

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

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

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

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

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Proceedings Article | 6 July 2006 Paper

Status of the JWST optical telescope element

Charlie Atkinson, Scott Texter, Robert Hellekson, Kevin Patton, Ritva Keski-Kuha, Lee Feinberg

Proceedings Volume 6265, 62650T (2006) https://doi.org/10.1117/12.671932

KEYWORDS: Optical components, Mirrors, Image segmentation, Control systems, Optical fabrication, Space telescopes, Optical telescopes, Stray light control, James Webb Space Telescope, Cryogenics

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

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Proceedings Article | 8 September 2005 Paper

Narrow-band EUV multilayer coating for the MOSES sounding rocket

Scott Owens, Jeffery Gum, Charles Tarrio, Steven Grantham, Joseph Dvorak, Benjawan Kjornrattanawanich, Ritva Keski-Kuha, Roger Thomas, Charles Kankelborg

Proceedings Volume 5900, 590003 (2005) https://doi.org/10.1117/12.617520

KEYWORDS: Spectrographs, Rockets, Optical design, Multilayers, Iron, Reflection, Silicon, Coating, Reflectivity, Extreme ultraviolet

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Proceedings Article | 24 September 2004 Paper

Instantaneous phase-shifted speckle interferometer for measurement of large optical structures

Babak Saif, James Millerd, Ritva Keski-Kuha, Lee Feinberg, James Wyant

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.550847

KEYWORDS: Carbon, Mirrors, Phase shifting, Speckle, Interferometers, Reflectivity, Phase interferometry, Optical testing, James Webb Space Telescope, Phase shifts

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Proceedings Article | 12 December 2003 Paper

Protected silver coatings for low-scatter SiC and SiC/Si mirror surfaces

James Heaney, Manuel Quijada, Ian Stevenson, Ritva Keski-Kuha, Jay Schwartz, Joseph Robichaud

Proceedings Volume 5179, (2003) https://doi.org/10.1117/12.507146

KEYWORDS: Mirrors, Polishing, Silica, Silicon, Silver, Reflectivity, Surface roughness, Bidirectional reflectance transmission function, Silicon carbide, Surface finishing

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Proceedings Article | 28 July 2000 Paper

NGST OTA optical metrology instrumentation and conceptual approaches

Ritva Keski-Kuha, Pierre Bely, Richard Burg, James Burge, Pamela Davila, Joseph Geary, John Hagopian, David Jacobson, Andrew Lowman, Steven Macenka, John Mangus, Charles Perrygo, David Redding, Babak Saif, W. Scott Smith, James Wyant

Proceedings Volume 4013, (2000) https://doi.org/10.1117/12.394050

KEYWORDS: Telescopes, Mirrors, Interferometers, Calibration, Interferometry, Wavefronts, Optical testing, Computer generated holography, Cryogenics, Phase shifts

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Proceedings Article | 22 October 1999 Paper

ASTRO-E/XRS blocking-filter calibration

Michael Audley, Keith Arnaud, Keith Gendreau, Kevin Boyce, Charles Fleetwood, Richard Kelley, Ritva Keski-Kuha, Frederick Porter, Caroline Stahle, Andrew Szymkowiak, June Tveekrem, Ryuichi Fujimoto, Kazuhisa Mitsuda, Yoshitaka Ishisaki, Tatehiro Mihara

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366558

KEYWORDS: Optical filters, Calibration, Spectroscopy, Digital filtering, X-rays, Oxygen, Finite element methods, Aluminum, Charge-coupled devices, Neon

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SPIE Journal Paper | 1 January 1999

Gas permeability through thin-foil X-ray filters

June Tveekrem, Ritva Keski-Kuha, Andrew Webb

OE, Vol. 38, Issue 01, (January 1999) https://doi.org/10.1117/12.10.1117/1.602248

KEYWORDS: Helium, Optical filters, Aluminum, Sensors, X-rays, Calibration, Nickel, Neon, Spectroscopy, Cryogenics

Proceedings Article | 10 November 1998 Paper

Multilayer coatings with high reflectance in the EUV

Juan Larruquert, Ritva Keski-Kuha

Proceedings Volume 3445, (1998) https://doi.org/10.1117/12.330330

KEYWORDS: Refractive index, Multilayers, Magnesium fluoride, Glasses, Optical coatings, Reflectivity, Extreme ultraviolet, Aluminum, Silicon carbide, Thin film coatings

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Proceedings Article | 28 August 1998 Paper

Optical metrology for the filter set for the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS)

Douglas Leviton, Rene Boucarut, Frank Bush, David Content, Ritva Keski-Kuha, Catherine Kral, Carolyn Krebs, Timothy Madison, Kimberly Mehalick, Linda Miner, Todd Norton, Peter Petrone, Bernard Puc, Clive Standley, Zlatan Tsvetanov, Frank Varosi

Proceedings Volume 3356, (1998) https://doi.org/10.1117/12.324536

KEYWORDS: Optical filters, Mirrors, Prisms, Silica, Cameras, Wavefronts, CCD cameras, Refraction, Image filtering, Transmittance

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Proceedings Article | 15 October 1997 Paper

Multilayer coatings for narrowband imaging in the extreme ultraviolet

Juan Larruquert, Ritva Keski-Kuha

Proceedings Volume 3114, (1997) https://doi.org/10.1117/12.283794

KEYWORDS: Multilayers, Magnesium fluoride, Reflection, Optical coatings, Reflectivity, Chromium, Extreme ultraviolet, Aluminum, Silicon carbide, Molybdenum

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Proceedings Article | 15 October 1997 Paper

Gas permeability through thin-foil x-ray filters

June Tveekrem, Ritva Keski-Kuha, Andrew Webb

Proceedings Volume 3114, (1997) https://doi.org/10.1117/12.278900

KEYWORDS: Optical filters, Sensors, Calibration, Spectroscopy, X-rays, Nickel, Aluminum, Helium, Cryogenics, Temperature metrology

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Proceedings Article | 11 July 1997 Paper

Metalized polyimide filters for x-ray astronomy and other applications

Forbes Powell, Ritva Keski-Kuha, Martin Zombeck, Richard Goddard, George Chartas, Leisa Townsley, Eberhard Moebius, John Davis, Glenn Mason

Proceedings Volume 3113, (1997) https://doi.org/10.1117/12.278873

KEYWORDS: Optical filters, Visible radiation, Imaging systems, Sensors, Spectroscopy, Ultraviolet radiation, X-rays, Image filtering, Aluminum, X-ray astronomy

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SPIE Journal Paper | 1 January 1997

Chemical vapor deposited silicon carbide mirrors for extreme ultraviolet applications

Ritva Keski-Kuha, John Osantowski, Douglas Leviton, Timo Saha, Geraldine Wright, Rene Boucarut, Charles Fleetwood, Timothy Madison

OE, Vol. 36, Issue 01, (January 1997) https://doi.org/10.1117/12.10.1117/1.601128

KEYWORDS: Mirrors, Silicon carbide, Chemical vapor deposition, Extreme ultraviolet, Reflectivity, Telescopes, Polishing, Scattering, Space telescopes, Surface roughness

Proceedings Article | 11 November 1996 Paper

Extreme ultraviolet BRDF measurements: instrumentation and results

Michael Newell, Ritva Keski-Kuha

Proceedings Volume 2864, (1996) https://doi.org/10.1117/12.258335

KEYWORDS: Visible radiation, Sensors, Copper, Reflectivity, Bidirectional reflectance transmission function, Extreme ultraviolet, Stray light, Scatter measurement, Information operations, Diffraction gratings

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Proceedings Article | 23 October 1995 Paper

CVD silicon carbide mirrors for EUV applications

Ritva Keski-Kuha, John Osantowski, Douglas Leviton, Timo Saha, Geraldine Wright, Rene Boucarut, Charles Fleetwood, Timothy Madison

Proceedings Volume 2543, (1995) https://doi.org/10.1117/12.225286

KEYWORDS: Telescopes, Mirrors, Polishing, Ions, Reflectivity, Chemical vapor deposition, Space telescopes, Ion beams, Extreme ultraviolet, Silicon carbide

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Proceedings Article | 23 October 1995 Paper

Efforts to control the EUV reflectance degradation of sputtered SiC films

Dan Schwarcz, Ritva Keski-Kuha

Proceedings Volume 2543, (1995) https://doi.org/10.1117/12.225298

KEYWORDS: Polishing, Argon, Ions, Silicon, Reflectivity, Chemical vapor deposition, Reflectometry, Extreme ultraviolet, Silicon carbide, Information operations

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Proceedings Article | 1 September 1995 Paper

Extreme ultraviolet scatter from particulate contaminated mirrors

Michael Newell, Laura Whitlock, Ritva Keski-Kuha, John Jackson

Proceedings Volume 2541, (1995) https://doi.org/10.1117/12.218335

KEYWORDS: Carbon, Modeling, Mirrors, Contamination, Data modeling, Sensors, Particles, Bidirectional reflectance transmission function, Extreme ultraviolet, Atmospheric modeling

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Proceedings Article | 14 July 1995 Paper

High-reflectance coatings and materials for the extreme ultraviolet

Ritva Keski-Kuha, John Osantowski, Gerry Blumenstock, Jeffrey Gum, Charles Fleetwood, Douglas Leviton, Timo Saha, John Hagopian, June Tveekrem, Geraldine Wright

Proceedings Volume 2428, (1995) https://doi.org/10.1117/12.213712

KEYWORDS: Mirrors, Multilayers, Polishing, Contamination, Optical coatings, Reflectivity, Chemical vapor deposition, Ion beams, Extreme ultraviolet, Silicon carbide

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Proceedings Article | 20 June 1995 Paper

Extreme ultraviolet optical properties of ion-beam-deposited boron carbide thin films

Gerry Blumenstock, Ritva Keski-Kuha, Marshal Ginter

Proceedings Volume 2515, (1995) https://doi.org/10.1117/12.212622

KEYWORDS: Thin films, Sensors, Optical coatings, Reflectivity, Extreme ultraviolet, Boron, Chemical analysis, Silicon carbide, Monochromators, Thin film coatings

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Proceedings Article | 19 October 1994 Paper

Qualification of CO2 jet spray cleaning for use on magnesium-fluoride-protected aluminum coatings for the corrective optics space telescope axial replacement (COSTAR)

John Hagopian, Charles Fleetwood, Ritva Keski-Kuha, Douglas Leviton, Geraldine Wright, Charles Bowers

Proceedings Volume 2261, (1994) https://doi.org/10.1117/12.190154

KEYWORDS: Mirrors, Carbon dioxide, Contamination, Ultraviolet radiation, Particles, Optical coatings, Reflectivity, Surface roughness, Optical testing, UV optics

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SPIE Journal Paper | 1 February 1994

Reflective coating of 834 Å for imaging O⁺ ions

Supriya Chakrabarti, Jerry Edelstein, Ritva Keski-Kuha, Felix Threat

OE, Vol. 33, Issue 02, (February 1994) https://doi.org/10.1117/12.10.1117/12.155927

KEYWORDS: Coating, Reflectivity, Aluminum, Nickel, Silicon carbide, Magnesium fluoride, Scattering, Multilayers, Indium, Ions

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Proceedings Article | 1 February 1994 Paper

Design and fabrication of a 40-cm-diameter SiC-coated normal incidence telescope and spectrometer

Stephan McCandliss, Mel Martinez, Paul Feldman, Russell Pelton, Ritva Keski-Kuha, Jeffrey Gum

Proceedings Volume 2011, (1994) https://doi.org/10.1117/12.167206

KEYWORDS: Telescopes, Mirrors, Sensors, Calibration, Spectroscopy, Coating, Reflectivity, Space telescopes, Aluminum, Silicon carbide

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Proceedings Article | 21 January 1993 Paper

High-reflectance coatings for space applications in the EUV

Ritva Keski-Kuha, Jeffrey Gum, John Osantowski, Charles Fleetwood

Proceedings Volume 1742, (1993) https://doi.org/10.1117/12.140605

KEYWORDS: Mirrors, Spectrographs, Multilayers, Polishing, Optical coatings, Reflectivity, Chemical vapor deposition, Extreme ultraviolet, Silicon carbide, Diffraction gratings

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Proceedings Article | 1 June 1992 Paper

834-A reflective coating for magnetospheric imagery applications

Supriya Chakrabarti, Jerry Edelstein, Ritva Keski-Kuha, Felix Threat

Proceedings Volume 1744, (1992) https://doi.org/10.1117/12.60594

KEYWORDS: Multilayers, Magnesium fluoride, Imaging systems, Nickel, Ions, Coating, Reflectivity, Aluminum, Silicon carbide, Magnetosphere

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Proceedings Article | 1 January 1992 Paper

Rocket flight of a multilayer-coated high-density EUV toroidal grating

Ritva Keski-Kuha, Roger Thomas, Joseph Davila

Proceedings Volume 1546, (1992) https://doi.org/10.1117/12.51263

KEYWORDS: Telescopes, Spectrographs, Rockets, Multilayers, Coating, Space telescopes, Spectral resolution, Extreme ultraviolet, Grazing incidence, Diffraction gratings

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Proceedings Article | 1 February 1991 Paper

EUV performance of a multilayer-coated high-density toroidal grating

Ritva Keski-Kuha, Roger Thomas, Werner Neupert, Charles Condor, Jeffrey Gum

Proceedings Volume 1343, (1991) https://doi.org/10.1117/12.23233

KEYWORDS: Spectrographs, Multilayers, Astronomy, X-ray optics, Coating, Reflectivity, Spectral resolution, Extreme ultraviolet, Astronomical imaging, Diffraction gratings

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