Mr. Timothy N. Miller Profile

Timothy N. Miller

Optical Engineer at University of California Berkeley

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

The Keck-FOBOS spectroscopic facility: conceptual design

Kevin Bundy, Kyle Westfall, Nick MacDonald, Renate Kupke, Claire Poppett, Timothy Miller, Jon Lawrence, Celestina Saavedra Lacombea, Renbin Yan, Michael Goodwin, Marc Kassis, John O'Meara, Daniel Masters, Joseph Burchett, Benjamin Williams, Robert Rich, V. Villar, Nathan Sandford, Yuan-Sen Ting, Phil Hinz, Chad Schafer, Rachel Mandelbaum, Marina Huang, J. Prochaska, Puragra Guhathakurta

Proceedings Volume 11447, 114471D (2020) https://doi.org/10.1117/12.2562914

KEYWORDS: Imaging spectroscopy, Spectrographs, Spectroscopy, Panoramic photography, Large Synoptic Survey Telescope, Telescopes, Excel, Cameras

Read Abstract +

The Fiber Optic Broad-band Optical Spectrometer (FOBOS) is a high-priority spectroscopic facility concept for the W. M. Keck Observatory. Here, we provide an update on the FOBOS conceptual design. FOBOS will deploy 1800 fibers across the 20-arcminute field-of-view of the Keck II Telescope. Starbugs fiber positioners will be used to deploy individual fibers as well as fiber-bundle arrays (integral field units, IFUs). Different combinations of active single fibers or IFUs can be selected to carry light to one of three mounted spectrographs, each with a 600-fiber pseudoslit. Each spectrograph has four wavelength channels, enabling end-to-end instrument sensitivity greater than 30% from 0.31-1.0 µm at a spectral resolution of R ~ 3500. With its high fiber density on a large telescope and modest field-of-view, FOBOS is optimized to obtain deep spectroscopy for large samples. In single- fiber mode, it will deliver premier spectroscopic reference sets for maximizing the information (e.g., photometric redshifts) that can be extracted from panoramic imaging surveys obtained from the forthcoming Rubin and Roman Observatories. Its IFUs will map emission from the circumgalactic interface between forming galaxies and the intergalactic medium at z ~ 2–3, and lay the path for multiplexed resolved spectroscopy of high-z galaxies aided by ground-layer and multi-object adaptive optics. In the nearby universe, its high sampling density and combination of single-fiber and IFU modes will revolutionize our understanding of the M31 disk and bulge via stellar populations and kinematics. Finally, with a robust and intelligent target and program allocation system, FOBOS will be a premier facility for follow-up of rare, faint, and transient sources that can be interleaved into its suite of observing programs. With a commitment to delivering science-ready data products, FOBOS will enable unique and powerful combinations of focused, PI-led programs and community-driven observing campaigns that promise major advances in cosmology, galaxy formation, time-domain astronomy, and stellar evolution.

Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Keck Planet Finder: design updates

Steven Gibson, Andrew Howard, Kodi Rider, Arpita Roy, Jerry Edelstein, Marc Kassis, Jason Grillo, Sam Halverson, Martin Sirk, Christopher Smith, Steve Allen, Ashley Baker, Charles Beichman, Bruce Berriman, Thomas Brown, Kelleen Casey, Jason Chin, David Coutts, David Cowley, William Deich, Tobias Feger, Benjamin Fulton, Luke Gers, Yulia Gurevich, Yuzo Ishikawa, Ean James, Sharon Jelinsky, Stephen Kaye, Kyle Lanclos, Adela Li, Scott Lilley, Ben McCarney, Tim Miller, Steve Milner, Timothy O'Hanlon, Jacob Pember, Mike Raffanti, Constance Rockosi, Ryan Rubenzahl, Dave Rumph, Dale Sandford, Maureen Savage, Christian Schwab, Andreas Seifahrt, Abby Shaum, Roger Smith, Julian Stuermer, Jim Thorne, Adam Vandenberg, Tod Von Boeckmann, Cindy Wang, Qifan Wang, Marie Weisfeiler, Mavourneen Wilcox, Edward Wishnow, Peter Wizinowich, Truman Wold, Anna Wolfenberger

Proceedings Volume 11447, 1144742 (2020) https://doi.org/10.1117/12.2561783

KEYWORDS: Planets, Spectroscopy, Keck Observatory, Exoplanets, Doppler effect, Optical fabrication, Zerodur, Optical benches, Charge-coupled devices, CCD image sensors

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Fabrication of the DESI corrector lenses

Timothy Miller, Robert Besuner, Michael Levi, Michael Lampton, Patrick Jelinsky, Henry Heetderks, David Schlegel, Jerry Edelstein, Peter Doel, David Brooks, Stephen Kent, Gary Poczulp, Michael Sholl

Proceedings Volume 10706, 107060X (2018) https://doi.org/10.1117/12.2312949

KEYWORDS: Lenses, Telescopes, Polishing, Glasses, Tolerancing, Astronomy, Silica, Optical design, Data modeling, Surface finishing

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Broadband anti-reflection coating for the meter class Dark Energy Spectroscopic Instrument lenses

Charles Kennemore, Debi Archer, Russ Barbaria, Joe Bertolina, Rick Dix, Katy Dodson, Sharon Doi-Okray, Aaron Gallon, Bill Sweet, Timothy Miller, Robert Besuner, Michael Levi, Michael Lampton, Pat Jelinsky, Jerry Edelstein, David Schlegel, Jeremy McCauley, Henry Heetderks, Michael Sholl, Peter Doel, David Brooks, Stephen Kent

Proceedings Volume 10706, 107061S (2018) https://doi.org/10.1117/12.2313006

KEYWORDS: Coating, Lenses, Antireflective coatings, Spectroscopes, Astronomy, Computer aided design

Read Abstract +

The Dark Energy Spectroscopic Instrument (DESI), currently under construction, will be used to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fiber optic positioners. The fibers, in turn, feed ten broad-band spectrographs. We will describe the broadband AR coating (360 nm to 980nm) that was applied to the lenses of the camera system for DESI using ion assisted deposition techniques in a 3 m coating chamber. The camera has 6 lenses ranging in diameter from 0.8 m to 1.14 m, weighing from 84 kg to 237 kg and made from fused silica or BK7. The size and shape of the surfaces provided challenges in design, uniformity control, handling, tooling and process control. Single surface average transmission and minimum transmission met requirements. The varied optical surfaces and angle of incidence considerations meant the uniformity of the coating was of prime concern. The surface radius of curvature (ROC) for the 12 surfaces ranged from nearly flat to a ROC of 611 mm and a sag of 140 mm. One lens surface has an angle of incidence variation from normal incidence to 40°. Creating a design with a larger than required bandwidth to compensate for the non-uniformity and angle variation created the ability to reduce the required coating uniformity across the lens and a single design to be used for all common substrate surfaces. While a perfectly uniform coating is often the goal it is usually not practicable or cost effective for highly curved surfaces. The coating chamber geometry allowed multiple radial positions of the deposition sources as well as substrate height variability. Using these two variables we were able to avoid using any masking to achieve the uniformity required to meet radial and angle performance goals. Very broadband AR coatings usually have several very thin and optically important layers. The DESI coating design has layers approaching 3 nm in thickness. Having sensitive thin layers in the design meant controlling layer thickness and azimuthal variation were critical to manufacturing repeatability. Through use of strategically placed quartz crystal monitors combined with stable deposition plumes, the manufacturing variability was reduced to acceptable levels. Low deposition rates and higher rotation rates also provided some stability to azimuthal variation.

Proceedings Article | 6 July 2018 Paper

Paper

Keck Planet Finder: preliminary design

Steven Gibson, Andrew Howard, Arpita Roy, Christopher Smith, Sam Halverson, Jerry Edelstein, Marc Kassis, Edward Wishnow, Michael Raffanti, Steve Allen, Jason Chin, David Coutts, David Cowley, Jim Curtis, William Deich, Tobias Feger, Daniel Finstad, Yulia Gurevich, Yuzo Ishikawa, Ean James, Elisha Jhoti, Kyle Lanclos, Scott Lilley, Tim Miller, Steve Milner, Tom Payne, Kodi Rider, Constance Rockosi, Dale Sandford, Christian Schwab, Andreas Seifahrt, Martin Sirk, Roger Smith, Julian Stuermer, Marie Weisfeiler, Mavourneen Wilcox, Adam Vandenberg, Peter Wizinowich

Proceedings Volume 10702, 107025X (2018) https://doi.org/10.1117/12.2311565

KEYWORDS: Spectroscopy, Calibration, Planets, Zerodur, Doppler effect

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Proceedings Article | 9 August 2016 Paper

Paper

Stray light assessment and mitigation for the DESI front-end optical system

Timothy Miller, Michael Lampton, Robert Besuner, Michael Sholl, Ming Liang, Scott Ellis

Proceedings Volume 9908, 99088O (2016) https://doi.org/10.1117/12.2232845

KEYWORDS: Astronomy, Stray light, Telescopes, Observatories, Spectrographs, Light, Light scattering, Bidirectional reflectance transmission function, Scattering, Mirrors

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Proceedings Article | 9 August 2016 Paper

Paper

The prime focus corrector for dark energy spectroscopic instrument

Peter Doel, Robert Besuner, David Brooks, Brenna Flaugher, Giuseppe Gallo, Gaston Gutierrez, Stephen Kent, Michael Lampton, Michael Levi, Ming Liang, Timothy Miller, David Sprayberry

Proceedings Volume 9908, 99088D (2016) https://doi.org/10.1117/12.2232493

KEYWORDS: Spectroscopes, Spectrographs, Telescopes, Baryon acoustic oscillations, Lenses, Computer aided design, Silica, Polishing, Astronomy, Observatories

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Proceedings Article | 9 August 2016 Paper

Paper

Progress on the fabrication of the DESI corrector optics

Timothy Miller, Peter Doel, David Brooks, Michael Sholl, Michael Levi

Proceedings Volume 9908, 99088J (2016) https://doi.org/10.1117/12.2232739

KEYWORDS: Silica, Lenses, Telescopes, Spectroscopes, Telescopes, Silica, Surface finishing, Polishing, Astronomy, Coating, Tolerancing, Observatories

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Proceedings Article | 9 August 2016 Paper

Paper

Impact of optical distortions on fiber positioning in the dark energy spectroscopic instrument

Stephen Kent, Michael Lampton, A. Peter Doel, David Brooks, Tim Miller, Robert Besuner, Joe Silber, Ming Liang, David Sprayberry, Charles Baltay, David Rabinowitz

Proceedings Volume 9908, 99088F (2016) https://doi.org/10.1117/12.2232689

KEYWORDS: Cameras, Spectroscopes, Telescopes, Back illuminated sensors, Lenses, Charge-coupled devices, Astronomy, Polishing, Imaging systems, CCD cameras

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Proceedings Article | 9 August 2016 Paper

Paper

The alignment and assembly of the DESI prime focus corrector

David Brooks, Peter Doel, Robert Besuner, Brenna Flaugher, Giuseppe Gallo, Gaston Gutierrez, Stephen Kent, Michael Lampton, Michael Levi, Ming Liang, Timothy Miller, David Sprayberry, Andrew Stefanik

Proceedings Volume 9908, 99088C (2016) https://doi.org/10.1117/12.2232489

KEYWORDS: Optical alignment, Lenses, Baryon acoustic oscillations, Assembly tolerances, Optical alignment, Tolerancing, Silica, Cameras, Aluminum, Computer aided design, Astronomy

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Proceedings Article | 27 July 2016 Paper

Paper

Design of a wide field far-UV spectrometer for a mission to Mars

Edward Wishnow, Tim Miller, Matthew Fillingim, Jerry Edelstein, Robert Lillis, Eric Korpela, Scott England, William Van Shourt, Oswald Siegmund, Jason McPhate, Sasha Courtade, David Curtis, Justin Deighan, Michael Chaffin, Abdullah Harmoul, Hessa Al Matroushi

Proceedings Volume 9905, 990538 (2016) https://doi.org/10.1117/12.2233512

KEYWORDS: Ultraviolet radiation, Edge roughness, Sensors, Reflectivity, Reflection, Platinum, Charge-coupled devices, Ultraviolet coatings, CCD image sensors, Optical filters

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Proceedings Article | 18 July 2016 Paper

Paper

Optical design and optical properties of a VUV spectrographic imager for ICON mission

Jerome Loicq, Christian Kintziger, Alexandra Mazzoli, Tim Miller, Cathy Chou, Harald Frey, Thomas Immel, Stephen Mende

Proceedings Volume 9905, 990507 (2016) https://doi.org/10.1117/12.2232588

KEYWORDS: Electrons, X-rays, Sensors, Beryllium, Spectroscopy, Silicon, Spectral resolution, Solar energy, Solar processes, X-ray characterization

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Proceedings Article | 6 August 2014 Paper

Paper

The DESI wide field corrector optics

Peter Doel, Michael Sholl, Ming Liang, David Brooks, Brenna Flaugher, Gaston Gutierrez, Stephen Kent, Michael Lampton, Timothy Miller, David Sprayberry

Proceedings Volume 9147, 91476R (2014) https://doi.org/10.1117/12.2057172

KEYWORDS: Telescopes, Silica, Aspheric lenses, Astronomical imaging, Galactic astronomy, Optical design, Tolerancing, Astronomy, Spectroscopy, Astronomical telescopes

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Proceedings Article | 3 October 2011 Paper

Paper

Architecting 'operational' Earth monitoring satellites based on coupled climate modeling and existing sensor capabilities with constellation efficiencies: Part III

Douglas Helmuth, Raymond Bell, David Bennett, David Grant, Timothy Miller, Christopher Lentz

Proceedings Volume 8176, 81761M (2011) https://doi.org/10.1117/12.897562

KEYWORDS: Atmospheric modeling, Climatology, Systems modeling, Environmental sensing, Climate change, Satellites, Sensors, Atmospheric optics, Data modeling, Atmospheric sensing

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Proceedings Article | 13 October 2010 Paper

Paper

Architecting constellations of 'operational' earth monitoring satellites (Part II)

Douglas Helmuth, Raymond Bell, David Bennett, David Grant, Timothy Miller, Christopher Lentz

Proceedings Volume 7826, 78261C (2010) https://doi.org/10.1117/12.864645

KEYWORDS: Satellites, Climatology, Sensors, Climate change, Satellite communications, Environmental sensing, Space operations, Satellite imaging, MODIS, Sun

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Proceedings Article | 7 October 2009 Paper

Paper

Remote sensing satellite constellation for world-wide wild fire monitoring

David Bennett, Raymond Bell, Douglas Helmuth, Andrew Cochrane, Timothy Miller, Christopher Lentz

Proceedings Volume 7478, 74780W (2009) https://doi.org/10.1117/12.830640

KEYWORDS: Satellites, Sensors, Satellite imaging, MODIS, Flame detectors, Spatial resolution, Remote sensing, Landsat, Imaging systems, Earth observing sensors

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Proceedings Article | 23 September 2009 Paper

Paper

Triana II: a new constellation of operational earth remote sensing satellites

Douglas Helmuth, Raymond Bell, David Bennett, Timothy Miller, Christopher Lentz

Proceedings Volume 7474, 74741T (2009) https://doi.org/10.1117/12.830638

KEYWORDS: Climatology, Satellites, Climate change, Sensors, Environmental sensing, Remote sensing, Planets, Space operations, Spatial resolution, Earth observing sensors

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Proceedings Article | 23 September 2009 Paper

Paper

Hyperspectral architecture study for land management

Timothy Miller, Raymond Bell, Douglas Helmuth, David Bennett, Christopher Lentz

Proceedings Volume 7474, 74741J (2009) https://doi.org/10.1117/12.830641

KEYWORDS: Satellites, Remote sensing, Satellite communications, Sun, Sensors, Reflectivity, Staring arrays, Hyperspectral imaging, Ecosystems, Meteorological satellites

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Proceedings Article | 18 August 2005 Paper

Paper

An EUV spectrometer for mapping the heliopause and solar wind

M. Lampton, J. Edelstein, T. Miller, M. Gruntman

Proceedings Volume 5898, 589810 (2005) https://doi.org/10.1117/12.615553

KEYWORDS: Spectroscopy, Spectral resolution, Sensors, Solar processes, Extreme ultraviolet, Diffraction gratings, Ions, Diffraction, Plasma, Doppler effect

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Proceedings Article | 16 September 2003 Paper

Paper

Novel method for tracking in homogeneous volumetric media

Timothy Miller, John Butz, Thomas Milster, Warren Bletscher, Edwin Walker, Sang-Ki Park, David Felix

Proceedings Volume 5069, (2003) https://doi.org/10.1117/12.533072

KEYWORDS: Actuators, Diffractive optical elements, Optical tracking, Objectives, Prototyping, Photoresist materials, Servomechanisms, Optical storage, Control systems, Optical design

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Proceedings Article | 17 December 1998 Paper

Paper

Galmatheia: an FUV imaging spectrograph

Jerry Edelstein, William Dixon, Timothy Miller

Proceedings Volume 3443, (1998) https://doi.org/10.1117/12.333607

KEYWORDS: Spectrographs, Plasmas, Sensors, Ultraviolet radiation, Galactic astronomy, Reflectivity, Mirrors, Silicon, Spectral resolution, Optical properties

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Proceedings Article | 10 November 1998 Paper

Paper

FUV interferometric spectroscopy

Jerry Edelstein, Timothy Miller

Proceedings Volume 3445, (1998) https://doi.org/10.1117/12.330268

KEYWORDS: Spectroscopy, Interferometry, Distributed interactive simulations, Fourier transforms, Sensors, Spectrographs, Spectral resolution, UV optics, Fourier spectroscopy, Optical components

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Showing 5 of 22 publications

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