Dr. Andrew E. Lowman Profile

Dr. Andrew E. Lowman

Senior Optical Engineer at Wyant College of Optical Sciences

SPIE Involvement:

Author

Publications (44)

Proceedings Article | 27 August 2024 Poster + Paper

Fabrication of the first GMT ASM reference body

In-Ung Song, Ho-Soon Yang, Andrew Lowman, Chang Jin Oh, Daniel Caywood, Jamison Noenickx, Roberto Biasi, Daniele Gallieni

Proceedings Volume 13097, 130975J (2024) https://doi.org/10.1117/12.3020900

KEYWORDS: Fabrication, Surface finishing, Optical surfaces, Optical fabrication, Zerodur

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Proceedings Article | 7 April 2020 Paper

Reconfigurable dynamic optical system design, test, and data analysis

Dae Wook Kim, Maham Aftab, Isaac Trumper, Logan Graves, Henry Quach, Hyukmo Kang, Hyemin Yoo, Andrew Lowman, Greg Smith, Matt Dubin, Chang-Jin Oh, Justin Hyatt, Christian Davila-Peralta, Heejoo Choi

Proceedings Volume 11352, 1135202 (2020) https://doi.org/10.1117/12.2555650

KEYWORDS: Deflectometry, Freeform optics, Optical testing, Optical design, Optics manufacturing, Infrared radiation, Metrology, Data analysis, Mirrors

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Proceedings Article | 14 September 2018 Presentation + Paper

Improvements in the scanning long-wave optical test system

Hyemin Yoo, Greg Smith, Chang Jin Oh, Andrew Lowman, Matthew Dubin

Proceedings Volume 10742, 1074216 (2018) https://doi.org/10.1117/12.2321265

KEYWORDS: Mirrors, Interferometry, Optical testing, Optical scanning systems, Deflectometry, Polishing

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Proceedings Article | 10 July 2018 Presentation + Paper

Process optimization for efficient convergence in large optics fabrication

Chang Jin Oh, Andrew Lowman, Hubert Martin, Greg Smith

Proceedings Volume 10706, 107060D (2018) https://doi.org/10.1117/12.2314350

KEYWORDS: Mirrors, Polishing, Metrology, Surface finishing, Off axis mirrors, Optical fabrication, Telescopes, Aspheric lenses, Interferometry, Materials processing

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Proceedings Article | 10 July 2018 Presentation

Fabrication, integration and testing of 6.5m primary mirror and telescope cell assembly for the University of Tokyo Atacama Observatory (Conference Presentation)

Chang Jin Oh, Andrew Lowman, Matthew Dubin, Greg Smith, William Verts, Jamison Noenickx, Thomas Connors

Proceedings Volume 10706, 107060U (2018) https://doi.org/10.1117/12.2314303

KEYWORDS: Mirrors, Optical fabrication, Metrology, Telescopes, Observatories, Optical metrology, Visible radiation, Optical engineering, Integrated optics, Infrared radiation

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The Optical Engineering and Fabrication Facility (OEFF) at the College of Optical Sciences, University of Arizona has successfully fabricated a 6.5m primary mirror and conducted integration and testing (I & T) of the primary mirror and telescope cell assembly for the University of Tokyo Atacama Observatory. The mirror has been fabricated using a new facility and advanced technologies developed by the group, including fabrication process optimization, a super-stable optical metrology support, infrared and visible metrology with high accuracy, and interferometry. Fabrication process optimization has simulated the entire fabrication process from the initial grinding to final polishing to specification, and optimized the tooling, frequency of metrology, and estimated convergence. Through the project the new process optimization successfully demonstrated the performance and guided the process in a deterministic way. The 6.5m primary mirror is made of E6 bolo-silicate glass with a honeycomb structure. Due to the scale it requires a mechanically and thermally stable metrology support to ensure highly accurate metrology. The new metrology support has demonstrated its extremely stable force stability and thermal stability over the project period. Metrology of large optics is always a challenge and the OEFF group has made outstanding advancement in IR and visible metrology and applied them seamlessly during the mirror fabrication with extremely low uncertainty. By applying the newly developed facility and technologies, the OEFF group successfully fabricated the 6.5m primary mirror in less than 7months, which is about 3 times faster than past 6.5m mirror fabrication at UA. After fabrication the mirror was integrated to the telescope cell and the primary mirror cell assembly has been tested using optical metrology to identify the static and dynamic behavior of the system. The testing includes support actuator influence functions, the nominal support force set, bending mode correction, and assessment of deliverable image quality. This paper presents the technical aspects of the mirror fabrication, advancement of metrology and I & T of the 6.5m primary mirror assembly.

Proceedings Article | 10 July 2018 Presentation + Paper

Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS)

Andrew Lowman, Greg Smith, Lori Harrison, Steven West, Chang Jin Oh

Proceedings Volume 10706, 107061E (2018) https://doi.org/10.1117/12.2313855

KEYWORDS: Mirrors, Interferometry, Cameras, Zemax, Calibration, Ray tracing, Monochromatic aberrations, Mirror pointing, Off axis mirrors, Deflectometry

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Proceedings Article | 22 July 2016 Paper

Manufacturing of super-polished large aspheric/freeform optics

Dae Wook Kim, Chang-jin Oh, Andrew Lowman, Greg Smith, Maham Aftab, James Burge

Proceedings Volume 9912, 99120F (2016) https://doi.org/10.1117/12.2232237

KEYWORDS: Optical fabrication, Mirrors, Surface finishing, Optics manufacturing, Spatial frequencies, Optical testing, Off axis mirrors, Interferometry, Deflectometry, Polishing

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Proceedings Article | 22 July 2016 Paper

Modern technologies of fabrication and testing of large convex secondary mirrors

Chang Jin Oh, Andrew Lowman, Matt Dubin, Greg Smith, Eric Frater, Chunyu Zhao, James Burge

Proceedings Volume 9912, 99120R (2016) https://doi.org/10.1117/12.2233887

KEYWORDS: Mirrors, Optical fabrication, Profilometers, Stitching interferometry, Aspheric lenses, Computer generated holography, Interferometers, Telescopes, Large Synoptic Survey Telescope, Interferometry

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Proceedings Article | 22 July 2016 Paper

Fabrication and testing of 4.2m off-axis aspheric primary mirror of Daniel K. Inouye Solar Telescope

Chang Jin Oh, Andrew Lowman, Greg Smith, Peng Su, Run Huang, Tianquan Su, Daewook Kim, Chunyu Zhao, Ping Zhou, James Burge

Proceedings Volume 9912, 99120O (2016) https://doi.org/10.1117/12.2229324

KEYWORDS: Mirrors, Optical fabrication, Metrology, Interferometry, Off axis mirrors, Bidirectional reflectance transmission function, Mirrors, Solar telescopes, Surface finishing, Solar telescopes, Computer generated holography, Aspheric lenses

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Proceedings Article | 22 July 2014 Paper

Development of a wide field spherical aberration corrector for the Hobby Eberly Telescope: design, fabrication and alignment

Chang Jin Oh, Eric Frater, Andrew Lowman, Peng Su, Chunyu Zhao, Ping Zhou, James Burge

Proceedings Volume 9145, 914509 (2014) https://doi.org/10.1117/12.2056879

KEYWORDS: Mirrors, Computer generated holography, Monochromatic aberrations, Optical alignment, Tolerancing, Telescopes, Optical instrument design, Optical testing, Optical fabrication, Aspheric optics

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Proceedings Article | 10 September 2013 Paper

Alignment of four-mirror wide field corrector for the Hobby-Eberly Telescope

Chang Jin Oh, Eric Frater, Laura Coyle, Matt Dubin, Andrew Lowman, Chunyu Zhao, James Burge

Proceedings Volume 8844, 884403 (2013) https://doi.org/10.1117/12.2023427

KEYWORDS: Mirrors, Computer generated holography, Optical alignment, Monochromatic aberrations, Microscopes, Telescopes, Optical spheres, Tolerancing, Image registration, Modulation

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Proceedings Article | 7 July 2006 Paper

Performance of TPF's high-contrast imaging testbed: modeling and simulations

Erkin Sidick, Fang Shi, Scott Basinger, Dwight Moody, Andrew Lowman, Andreas Kuhnert, John Tauger

Proceedings Volume 6265, 62653L (2006) https://doi.org/10.1117/12.670524

KEYWORDS: Coronagraphy, Light sources, Photomasks, Algorithm development, Wavefronts, Modeling and simulation, Near field optics, Phase measurement, Data modeling, Optical components

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Proceedings Article | 5 October 2005 Paper

Wavefront amplitude variation of TPF's high-contrast imaging testbed: modeling and experiment

Fang Shi, Andrew Lowman, Dwight Moody, Albert Niessner, John Trauger

Proceedings Volume 5905, 59051L (2005) https://doi.org/10.1117/12.618574

KEYWORDS: Mirrors, Wavefronts, Cameras, Near field optics, Imaging systems, Stars, Optical testing, Semiconductor lasers, Planets, Wavefront sensors

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Proceedings Article | 26 August 2005 Paper

Off-axis scatter measurement of the Mars reconnaissance Orbiter (MRO) Optical Navigation Camera (ONC)

John Stauder, Andrew Lowman, Dave Thiessen, Darryl Day, D. Miles

Proceedings Volume 5874, 58740L (2005) https://doi.org/10.1117/12.619857

KEYWORDS: Cameras, Sensors, Stray light, Mars Reconnaissance Orbiter, Mirrors, Optical navigation, Collimation, Contamination, Space reconnaissance, Optical testing

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Proceedings Article | 15 October 2004 Paper

Stray light lessons learned from the Mars Reconnaissance Orbiter's Optical Navigation Camera

Andrew Lowman, John Stauder

Proceedings Volume 5526, (2004) https://doi.org/10.1117/12.566080

KEYWORDS: Stray light, Lenses, Mirrors, Mars, Cameras, Interfaces, Surface finishing, Mechanical engineering, Light scattering, Glasses

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Proceedings Article | 12 October 2004 Paper

The Terrestrial Planet Finder coronagraph: technology and mission design studies

Virginia Ford, P. Lisman, Stuart Shaklan, John Trauger, Timothy Ho, Daniel Hoppe, Andrew Lowman

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551539

KEYWORDS: Coronagraphy, Planets, Stars, Mirrors, Wavefronts, Deformable mirrors, Light scattering, Space telescopes, Systems modeling, Telescopes

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Proceedings Article | 12 October 2004 Paper

Phase Retrieval Camera optical testing of the Advanced Mirror System Demonstrator (AMSD)

Catherine Ohara, Jessica Faust, Andrew Lowman, Joseph Green, David Redding, Scott Basinger, David Cohen, Fang Shi

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551793

KEYWORDS: Mirrors, James Webb Space Telescope, Magnesium, Wavefront sensors, Phase retrieval, Wavefronts, Iris, Point spread functions, Cameras, Optical testing

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Proceedings Article | 12 October 2004 Paper

High-contrast imaging testbed for the Terrestrial Planet Finder coronagraph

Andrew Lowman, John Trauger, Brian Gordon, Joseph Green, Dwight Moody, Albert Niessner, Fang Shi

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.547710

KEYWORDS: Coronagraphy, Cameras, Planets, Mirrors, Wavefront sensors, Wavefronts, Deformable mirrors, Stars, Control systems, Space telescopes

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Proceedings Article | 12 October 2004 Paper

Wavefront control testbed experimental results

Laura Burns, Scott Basinger, Scott Campion, Jessica Faust, Lee Feinberg, Joseph Green, William Hayden, Andrew Lowman, Catherine Ohara, Peter Petrone, David Redding, Fang Shi, David Van Buren, Barbara Zukowski

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551794

KEYWORDS: Image segmentation, Wavefronts, Mirrors, James Webb Space Telescope, Space telescopes, Visibility, Telescopes, Wavefront sensors, Phase retrieval, Device simulation

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Proceedings Article | 12 October 2004 Paper

Coronagraph contrast demonstrations with the high-contrast imaging testbed

John Trauger, Chris Burrows, Brian Gordon, Joseph Green, Andrew Lowman, Dwight Moody, Albert Niessner, Fang Shi, Daniel Wilson

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.552520

KEYWORDS: Coronagraphy, Space telescopes, Wavefronts, Photomasks, Mirrors, Stars, Telescopes, Deformable mirrors, Algorithm development, Wavefront sensors

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Proceedings Article | 19 November 2003 Paper

Terrestrial Planet Finder coronagraph

Virginia Ford, Anthony Hull, Stuart Shaklan, Marie Levine, Mary White, Andrew Lowman, Eri Cohen

Proceedings Volume 5170, (2003) https://doi.org/10.1117/12.512633

KEYWORDS: Coronagraphy, Mirrors, Planets, Performance modeling, Telescopes, Wavefronts, Stars, Thermal modeling, Light scattering, Space telescopes

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