Dr. William D. Cowan Profile

Dr. William D. Cowan

Principal Member of Technical Staff

SPIE Involvement:

Author

Publications (24)

Proceedings Article | 27 April 2010 Paper

Ultra-compact optical true time delay device for wideband phased array radars

Betty Lise Anderson, James Ho, William Cowan, Olga Spahn, Allen Yi, Martin Flannery, Delton Rowe, David McCray, David Rabb, Peter Chen

Proceedings Volume 7669, 76690P (2010) https://doi.org/10.1117/12.850278

KEYWORDS: Mirrors, Microelectromechanical systems, Receivers, Signal attenuation, Picosecond phenomena, Phased array optics, Diamond turning, Microlens array, Phased arrays, Radar

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Proceedings Article | 8 February 2008 Paper

Performance of a MEMS reflective wavefront sensor

Jonathan Andrews, Scott Teare, Sergio Restaino, Ty Martinez, Christopher Wilcox, David Wick, William Cowan, Olga Spahn, Brett Bagwell

Proceedings Volume 6888, 68880C (2008) https://doi.org/10.1117/12.763866

KEYWORDS: Mirrors, Wavefront sensors, Actuators, Microelectromechanical systems, Reflectivity, Image segmentation, Adaptive optics, Deformable mirrors, Cameras, Telescopes

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Proceedings Article | 14 February 2007 Paper

Active zoom imaging for operationally responsive space

Brett Bagwell, David Wick, William Cowan, Olga Blum Spahn, William Sweatt, Ty Martinez, Sergio Restaino, Jonathan Andrews, Christopher Wilcox, Don Payne, Robert Romeo

Proceedings Volume 6467, 64670D (2007) https://doi.org/10.1117/12.706820

KEYWORDS: Mirrors, Active optics, Zoom lenses, Microelectromechanical systems, Imaging systems, Micromirrors, Actuators, Telescopes, Wavefronts, Space operations

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Proceedings Article | 4 August 2006 Paper

Wavefront correction using micromirror arrays: comparing the efficacy of tip-tilt-piston and piston-only micromirror arrays

William Sweatt, Olga Spahn, William Cowan, David Wick

Proceedings Volume 6342, 634207 (2006) https://doi.org/10.1117/12.692194

KEYWORDS: Micromirrors, Wavefronts, Turbulence, Mirrors, Telescopes, Actuators, Monochromatic aberrations, Astronomical telescopes, Spherical lenses, Optical design

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Proceedings Article | 1 February 2002 Paper

Control of line-addressable micromirror phase arrays using electromechanical bistability

Harris Hall, Eric Magee, William Cowan

Proceedings Volume 4493, (2002) https://doi.org/10.1117/12.454705

KEYWORDS: Control systems, Chemical elements, Micromirrors, Bistability, Mirrors, Control systems design, Modulation, Microelectromechanical systems, Digital micromirror devices, Electromechanical design

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Proceedings Article | 22 November 2000 Paper

Micro-electro-mechanical systems spatial light modulator development

Scot Olivier, Paul Bierden, Thomas Bifano, David Bishop, Emily Carr, William Cowan, Matthew Hart, Michael Helmbrecht, Peter A. Krulevitch, Richard Muller, Bernard Sadoulet, Olav Solgaard, J. Yu

Proceedings Volume 4124, (2000) https://doi.org/10.1117/12.407513

KEYWORDS: Mirrors, Microelectromechanical systems, Actuators, Spatial light modulators, Adaptive optics, Electronics, Gold, Control systems, Analytical research, Wavefronts

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SPIE Journal Paper | 1 October 2000

Adaptive optics systems implemented using two-dimensional phase retrieval and a microelectromechanical deformable mirror

Stanley Rogers, Frank Scarpino, Tommy Williamson, Max Lee, Jason Baumbach, William Cowan, Donald Wiff

OE, Vol. 39, Issue 10, (October 2000) https://doi.org/10.1117/12.10.1117/1.1308926

KEYWORDS: Adaptive optics, Phase retrieval, Beam shaping, Beam splitters, Beam steering, Mirrors, Wavefronts, Control systems, Point spread functions, Image processing

Proceedings Article | 22 August 2000 Paper

Materials impacts on micro-opto-electro-mechanical systems

William Cowan

Proceedings Volume 4178, (2000) https://doi.org/10.1117/12.396478

KEYWORDS: Mirrors, Microopto electromechanical systems, Metals, Thin films, Process control, Actuators, Raman spectroscopy, Deformable mirrors, Semiconducting wafers, Microfabrication

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Proceedings Article | 1 October 1999 Paper

Adaptive optics systems implemented using two-dimensional phase retrieval and a MEMS deformable mirror

Stanley Rogers, Frank Scarpino, Tommy Williamson, Max Lee, Jason Baumbach, William Cowan, Donald Wiff

Proceedings Volume 3805, (1999) https://doi.org/10.1117/12.363985

KEYWORDS: Beam splitters, Beam shaping, Adaptive optics, Phase retrieval, Beam steering, Control systems, Wavefronts, Microelectromechanical systems, Analog electronics, Point spread functions

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Proceedings Article | 19 July 1999 Paper

Micro-electro-mechanical deformable mirrors for advanced adaptive optics applications

J. Decker, Scot Olivier, James Folta, William Cowan

Proceedings Volume 3749, (1999) https://doi.org/10.1117/12.355006

KEYWORDS: Adaptive optics, Microelectromechanical systems, Imaging systems, Deformable mirrors, Atmospheric propagation, Standards development, Laser systems engineering, Wave propagation, Wavefronts, Actuators

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SPIE Journal Paper | 1 December 1998

Optical phase modulation using a refractive lenslet array and micro-electro-mechanical deformable mirror

William Cowan, Max Lee, Byron Welsh, Victor Bright, Michael Roggemann

OE, Vol. 37, Issue 12, (December 1998) https://doi.org/10.1117/12.10.1117/1.601998

KEYWORDS: Mirrors, Micromirrors, Point spread functions, Phase modulation, Cameras, Deformable mirrors, Reflectivity, Optical components, Beam steering, Thermal modeling

Proceedings Article | 11 September 1998 Paper

Evaluation of microfabricated deformable mirror systems

William Cowan, Max Lee, Victor Bright, Byron Welsh

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321696

KEYWORDS: Mirrors, Micromirrors, Digital micromirror devices, Point spread functions, Electrodes, Aberration correction, Beam steering, Cameras, Microfabrication, Deformable mirrors

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Proceedings Article | 20 April 1998 Paper

Design and testing of polysilicon surface-micromachined piston micromirror arrays

William Cowan, Victor Bright, Max Lee, John Comtois, M. Adrian Michalicek

Proceedings Volume 3292, (1998) https://doi.org/10.1117/12.305508

KEYWORDS: Mirrors, Micromirrors, Metals, Etching, Reflectivity, Point spread functions, Oxides, Chemical elements, Gold, Microscopes

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Proceedings Article | 17 October 1997 Paper

Experimental demonstration of using microelectromechanical deformable mirrors to control optical aberrations

Michael Roggemann, Victor Bright, Byron Welsh, Shaun Hick, Peter Roberts, William Cowan, John Comtois

Proceedings Volume 3126, (1997) https://doi.org/10.1117/12.279038

KEYWORDS: Mirrors, Wavefronts, Point spread functions, Micromirrors, Deformable mirrors, Microelectromechanical systems, Electrodes, Reflection, Cameras, Reflectivity

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Proceedings Article | 5 September 1997 Paper

SPICE modeling of polysilicon thermal actuators

Jeffrey Butler, Victor Bright, William Cowan

Proceedings Volume 3224, (1997) https://doi.org/10.1117/12.284526

KEYWORDS: Actuators, Thermal modeling, Performance modeling, Microelectromechanical systems, Amplitude modulation, Micromirrors, Resistance

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Proceedings Article | 2 September 1997 Paper

Vertical thermal actuators for micro-opto-electro-mechanical systems

William Cowan, Victor Bright

Proceedings Volume 3226, (1997) https://doi.org/10.1117/12.284561

KEYWORDS: Actuators, Microopto electromechanical systems, Mirrors, Beam steering, Interferometry, Microscopes

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Proceedings Article | 2 September 1997 Paper

Measuring frequency response of surface-micromachined resonators

William Cowan, Victor Bright, George Dalton

Proceedings Volume 3225, (1997) https://doi.org/10.1117/12.284552

KEYWORDS: Resonators, Microelectromechanical systems, Data modeling, Network security, Microscopes, Laser resonators, Interferometers, Manufacturing, Instrument modeling

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Proceedings Article | 2 September 1997 Paper

Modeling of stress-induced curvature in surface-micromachined devices

William Cowan, Victor Bright, Alex Elvin, David Koester

Proceedings Volume 3225, (1997) https://doi.org/10.1117/12.284554

KEYWORDS: Micromirrors, Computer aided design, Microelectromechanical systems, Mirrors, Instrument modeling, Measurement devices, Solid modeling, Data modeling, Mirror structures, Chromium

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Proceedings Article | 7 July 1997 Paper

Thermally actuated piston micromirror arrays

William Cowan, Victor Bright

Proceedings Volume 3131, (1997) https://doi.org/10.1117/12.277757

KEYWORDS: Mirrors, Micromirrors, Resistance, Actuators, Signal detection, Gold, Measurement devices, Thermal modeling, Nitrogen, Interferometers

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SPIE Journal Paper | 1 May 1997

Use of micro-electro-mechanical deformable mirrors to control aberrations in optical systems: theoretical and experimental results

Michael Roggemann, Victor Bright, Byron Welsh, Shaun Hick, Peter Roberts, William Cowan, John Comtois

OE, Vol. 36, Issue 05, (May 1997) https://doi.org/10.1117/12.10.1117/1.601355

KEYWORDS: Mirrors, Micromirrors, Point spread functions, Wavefronts, Deformable mirrors, Reflectivity, Diffraction, Aberration correction, Reflection, Control systems

Proceedings Article | 6 June 1995 Paper

Starfire optical range long-wavelength infrared acquisition camera: initial performance report

William Cowan, Paul LeVan, David Barnaby, Robert Johnson, Terry Duncan

Proceedings Volume 2475, (1995) https://doi.org/10.1117/12.211261

KEYWORDS: Cameras, Telescopes, Mirrors, Stars, Long wavelength infrared, Staring arrays, Germanium, Cryogenics, Composites, Imaging systems

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Proceedings Article | 26 April 1995 Paper

Laser beaming demonstrations at the Starfire Optical Range

Ronald Lipinski, Dorothy Meister, Steve Tucker, Phillip Leatherman, Robert Fugate, Carl Maes, W. Joseph Lange, William Cowan, Richard Cleis, James Spinhirne, Raymond Ruane, Janice Glover, Robert Michie, Andrew Meulenberg

Proceedings Volume 2376, (1995) https://doi.org/10.1117/12.208207

KEYWORDS: Satellites, Telescopes, Ruby lasers, Mirrors, Stars, Adaptive optics, Sensors, YAG lasers, Retroreflectors, Ruby

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Proceedings Article | 22 July 1994 Paper

128x128-pixel long-wavelength infrared acquisition camera

Paul LeVan, D'nardo Colucci, William Cowan, Brian Figie, Eric Stewart

Proceedings Volume 2217, (1994) https://doi.org/10.1117/12.179944

KEYWORDS: Detector arrays, Mirrors, Telescopes, Long wavelength infrared, Cameras, Satellites, Data acquisition, Target acquisition, Infrared detectors, Signal detection

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Proceedings Article | 1 May 1994 Paper

Laser beaming demonstrations to high-orbit satellites

Ronald Lipinski, Dorothy Meister, Steve Tucker, Robert Fugate, Phillip Leatherman, Carl Maes, W. Joseph Lange, William Cowan, Andrew Meulenberg, Richard Cleis, James Spinhirne, Raymond Ruane, Robert Michie, Donald Vonderhaar

Proceedings Volume 2121, (1994) https://doi.org/10.1117/12.174184

KEYWORDS: Satellites, Telescopes, Adaptive optics, Atmospheric optics, Retroreflectors, Diffraction, Stars, Ruby lasers, Space telescopes, Mirrors

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Showing 5 of 24 publications

Conference Committee Involvement (11)

MEMS Adaptive Optics VIII

2 February 2014 | San Francisco, California, United States

MEMS Adaptive Optics VII

5 February 2013 | San Francisco, California, United States

MEMS Adaptive Optics VI

25 January 2012 | San Francisco, California, United States

MEMS Adaptive Optics V

27 January 2011 | San Francisco, California, United States

MEMS Adaptive Optics IV

27 January 2010 | San Francisco, California, United States

Showing 5 of 11 Conference Committees

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