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Tyler D. Groff
Contact
Information
Department of Mechanical and Aerospace Engineering
Princeton University
Phone: (609) 258-8449
Engineering Quad, Olden St.
E-mail: [email protected]
Princeton, NJ 08544 USA
www.princeton.edu/∼tgroff/
Research
Interests
dynamics and control theory, engineering design, optical design, exoplanet science, observational astronomy, solar physics, space telescopes and exploration, instrumentation:
fundamental research in hardware, techniques, and methodologies to improve science
Education
Princeton University, Princeton, NJ USA
Ph.D., Department of Mechanical and Aerospace Engineering, September 2012
Advisor: N. Jeremy Kasdin
Thesis: Optimal Electric Field Estimation and Control for Coronagraphy
Topic: Optimal focal plane electric field estimation and broadband control to
improve the accuracy and robustness of wavefront control systems designed to
suppress quasi-static speckles in coronagraphic instrumentation
M.A. Department of Mechanical and Aerospace Engineering, November 2009
Advisor: N. Jeremy Kasdin
Major Area: Dynamics and Controls, Minor Area: Applied Physics/Optics
Tufts University, Medford, MA USA
School of Engineering: Department of Mechanical Engineering
B.S., Mechanical Engineering and Astrophysics, Magna Cum Laude, May 2007
Advisor: Robert White
Thesis: Acoustic Damping of Micromachined Diaphragms with Static Pressure
Equalization
Honors,
Awards and
Affiliations
Nancy Grace Roman Technology Fellowship, 2015
• NASA grant to continue ferrofluid DM project and develop surrounding instrumentation architecture.
Eric and Wendy Schmidt Transformative Technology Fund Recipient, 2013
• Princeton grant to develop a deformable mirror concept based on ferrofluid technology
Graduate Fellowships and Awards
• NASA Earth and Space Science Graduate Fellowship, 2010-2012
• Crocco Award for Teaching Excellence, Princeton University, 2011
• Honorable Mention NSF Graduate Research Fellowship Program, 2009
Professional Affiliations
• Member of SPIE, May 2009 - present
• Member of the American Astronomical Society, September 2008-present
• Member of IEEE, 2012-2014
• Member of Tau Beta Pi, 2007-present
Research and
Professional
Experience
Associate Research Scholar
July 2014-present
Princeton Universiey
Chief Optical Scientist for CHARIS and Lab Manager
Mentoring and research support for research staff in the High Contrast Imaging Laboratory. PI of ferrofluid-based deformable mirror project
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Postdoctoral Research Associate
2012-June 2014
Princeton University
Chief Optical Scientist - CHARIS Integral Field Spectrograph
Project management, translating science requirements into engineering requirements, optical and mechanical design, and development of the instruments scientific capabilities
Strategic Exploration of Exoplanets and Disks (SEEDS) Member 2010-present
Subaru Telescope/Princeton University
Certified Engineer in Training
New Jersey State Board of Professional Engineers and Land Surveyors
2010
SCExAO Instrument Collaborator
June 2009-present
Subaru Telescope: Olivier Guyon
Ongoing development and design of the CHARIS sister project, the Subaru Coronagraphic
Extreme Adaptive Optics instrument
Engineering Intern
DFM Engineering, Inc.: Dr. Frank Melsheimer
Student Researcher, Field of Solar Physics
Tufts Astronomy: Dr. Robert Willson
Teaching
Experience
Summers 2006- 2008
Summer 2005
Lecturer: Introduction to Engineering Dynamics MAE 206
Princeton University, Spring 2014
• Lecturer for sophomore level course on Newtonian mechanics
Graduate Teaching Fellow, McGraw Center
Princeton University, 2011
• Engineering instructor for a short course new teaching assistants are required to take
Teaching Assistant: Introduction to Engineering Dynamics, MAE 206
Princeton University, Spring 2010 & 2011
• Sophomore level dynamics class required for all MAE students
• Wrote problem sets and solutions, graded homework, held weekly office hours and
precept, and gave several lectures
Teaching Assistant: Engineering Design, MAE 321
Princeton University, Fall 2010
• Junior level machine design course required for MAE students
• Wrote problem sets and solutions, graded homework, held weekly office hours, assisted
in the machine shop component, and gave several lectures
Teaching Assistant: Introduction to Engineering, EGR 194
Princeton University, Spring 2010
• Introduced freshmen to programming and data analysis using MATLAB
• Developed and ran the robotics and mechanical design lab
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Publications
and
Presentations
Peer Reviewed Journal Articles
[1] T. D. Groff, A J Riggs, B. Kern, and N. J. Kasdin. Methods and limitations of focal
plane sensing, estimation, and control in high contrast imaging. JATIS, 2(1), 2015.
[2] T. D. Groff and N. J. Kasdin. Kalman filtering techniques for focal plane electric field
estimation. JOSA A, 30(1):128–139, 2013.
[3] A. J. Eldorado Riggs, N. J. Kasdin, and T. D. Groff. Recursive starlight and bias estimation for high-contrast imaging with an extended kalman filter. JATIS, 2(Accepted),
2015.
[4] L. Pueyo, J. Kay, N.J. Kasdin, T. Groff, M. McElwain, A. Give’on, and R. Belikov.
Optimal dark hole generation via two deformable mirrors with stroke minimization.
Applied Optics, 48(32):6296–6312, 2009.
[5] R.F. Willson and T.D. Groff. Very Large Array, SOHO, and RHESSI observations of
magnetic interactions and particle propagation across large-scale coronal loops. Solar
Physics, 250(1):89–105, 2008.
In Preparation
[1] T. D. Groff and N. J. Kasdin. Setting and complying with crosstalk requirements in
a high contrast integral field spectrograph. JOSA A, in preparation.
[2] T. D. Groff, N. J. Kasdin, and M. A. Limbach. L-BBH2: Cryogenic characterization and design of a new dispersing element for the near-ir. Optical Engineering, in
preparation.
[3] T. D. Groff and A. Lemmer. A new ferrofluid backed deformable mirror for high
precision wavefront control. Applied Optics, in preparation.
[4] T. D. Groff, N. J. Kasdin, M. A. Limbach, M. Galvin, M. A Carr, G. Knapp,
T. Brandt, C. Loomis, N. Jarosik, K. Mede, J. Gunn, R. Lupton, O. Guyon, N. Jovanovic, F. Martinache, N. Takato, and M. Hayashi. CHARIS: Final design, capabilities, and expected science yield for Subaru’s high contrast IFS. JATIS, in preparation.
Invited Talks
2/20/2015: The CHARIS IFS: An Example of High Contrast Imaging with a Spectrograph
, Star and Planet Formation Seminar Series, STScI, Maryland
2/28/2014: CHARIS: Subaru’s Exoplanet Imaging Spectrograph, Gravity Group Seminar,
Princeton, NJ
12/10/2013: The CHARIS High Contrast Imaging Spectrograph, 5th Subaru International
Conference, Kona, HI
02/11/2013: Designing the CHARIS Integral Field Spectrograph for Imaging Exoplanets,
Department of Astronomy, Cornell University, NY
11/30/2011: Optimization of Focal Plane Wavefront Estimation and Control in Polychromatic Light for High Contrast Imaging, Department of Aeronautics and Astronautics,
MIT, MA
08/18/2011: Enabling Technology for Coronagraphic Imaging; Optimal Broadband Wavefront Control, Ames Research Center, Mountain View, CA
02/23/2011: Optimal Focal Plane Wavefront Control in Polychromatic Light for High
Contrast Imaging, Goddard Space Flight Center, Greenbelt, MD
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Conference Presentations and Papers
[1] T. D. Groff, N. J. Kasdin, M. A. Limbach, M. Galvin, M. Carr, G. Knapp, T. Brandt,
C. Loomis, N. Jarosik, K. Mede, M. McElwain, D. Leviton, K. Miller, M. Quijada,
O. Guyon, N Jovanovic, N. Takato, and M. Hayashi. The CHARIS IFS for high
contrast imaging at subaru. In Proc. SPIE, volume 9605, page 96051C, 2015.
[2] D. Leviton, K. Miller, M. Quijada, and T. D. Groff. Temperature-dependent refractive
index measurements of l-bbh2 glass for the subaru charis integral field spectrograph.
In Proc. SPIE, volume 9578, page 95780J, 2015.
[3] A. Lemmer, T. D. Groff, N. J. Kasdin, D. Echeverri, and I. Cleff. Techological progress
of a ferrofluid deformable mirror with tunable nominal optical power for high-contrast
imaging. In Proc. SPIE, volume 9605, page 960525, 2015.
[4] T. D. Groff, N. J. Kasdin, M. A. Limbach, M. Galvin, M. Carr, G. Knapp, T. Brandt,
C. Loomis, N. Jarosik, K. Mede, M. McElwain, M. Janson, O. Guyon, N Jovanovic,
N. Takato, F Martinache, and M. Hayashi. Construction and status of the CHARIS
high contrast imaging spectrograph. In Proc. SPIE, volume 9147, page 91471W, 2014.
[5] T. Brandt, M. McElwain, M. Janson, G. Knapp, K. Mede, M. A. Limbach, T. D. Groff,
A. Burrows, J. Gunn, O. Guyon, et al. CHARIS science: performance simulations
for the subaru telescope’s third-generation of exoplanet imaging instrumentation. In
Proc. SPIE, volume 9148, page 914849, 2014.
[6] M. A. Limbach, T. D. Groff, N. J. Kasdin, T. Brandt, K. Mede, C. Loomis, M. Hayashi,
and N. Takato. Eris: the exoplanet high-resolution image simulator for CHARIS. In
Proc. SPIE, volume 9147, page 91478E, 2014.
[7] M. Galvin, M. Carr, T. D. Groff, N. J. Kasdin, R. Fagan, M. Hayashi, and N. Takato.
The mechanical design of CHARIS: an exoplanet ifs for the subaru telescope. In Proc.
SPIE, volume 9151, page 91513G, 2014.
[8] O. Guyon, Y. Hayano, M. Tamura, T Kudo, S. Oya, Y. Minowa, O. Lai, N Jovanovic,
N. Takato, N. J. Kasdin, T. D. Groff, M. Hayashi, N. Arimoto, H. Takami, C. Bradley,
H. Sugai, G. Perrin, P. Tuthill, and B. Mazin. Adaptive optics at the subaru telescope:
current capabilities and development. In Proc. SPIE, volume 9148, page 91481R, 2014.
[9] A J Riggs, N. J. Kasdin, and T. D. Groff. Optimal wavefront estimation of incoherent
sources. In Proc. SPIE, volume 9143, page 914324, 2014.
[10] T. D. Groff, M. A. Peters, N. J. Kasdin, G. Knapp, M. Galvin, M. Carr, M. McElwain, T. Brandt, M. Janson, J. Gunn, et al. Design of the CHARIS integral field
spectrograph for exoplanet imaging. In Proc. SPIE, page 88640H, 2013.
[11] T. D. Groff, N. J. Kasdin, S. Shaklan, and L. Pueyo. Wavefront control scenarios for
a coronagraph on an AFTA-like space telescope. In Proc. SPIE, page 886413, 2013.
[12] T. D. Groff, N. J. Kasdin, and M. A. Peters. Focal plane wavefront estimation using
an integral field spectrograph. In Aerospace Conference, 2013 IEEE, pages 1–8. IEEE,
2013.
[13] T. D. Groff, N. J. Kasdin, and A J Riggs. Optimizing focal plane electric field
estimation for detecting exoplanets. In Aerospace Conference, 2013 IEEE, pages 1–
12. IEEE, 2013.
[14] A. Riggs, T. D. Groff, A. Carlotti, N. J. Kasdin, E. Cady, B.D. Kern, and A. Kuhnert.
Demonstration of symmetric dark holes using two deformable mirrors at the highcontrast imaging testbed. In Proc. SPIE, volume 8864, page 88640T, 2013.
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[15] M. N’Diaye, E. Choquet, L. Pueyo, E. Elliot, M.D. Perrin, J. K. Wallace, T. D.
Groff, A. Carlotti, D. Mawet, M. Scheckells, et al. High-contrast imager for complex
aperture telescopes (hicat): 1. testbed design. In Proc. SPIE, page 88641K, 2013.
[16] T.D. Groff and N.J. Kasdin. Kalman filter estimation for focal plane wavefront
correction. In Proc. SPIE, volume 8442, pages 1–14. SPIE, 2012.
[17] T.D. Groff, N.J. Kasdin, A. Carlotti, and A.J.E. Riggs. Broadband focal plane
wavefront control of amplitude and phase aberrations. In Proc. SPIE, volume 8442,
page 84420C, 2012.
[18] M.A. Peters, T.D. Groff, N.J. Kasdin, M. McElwain, M. Galvin, M. Carr, R. Lupton, J. Gunn, G. Knapp, Q. Gong, A. Carlotti, T. Brandt, M. Janson, O. Guyon,
F. Martinache, M. Hayashi, and N. Takato. Conceptual design of the coronagraphic
high angular resolution imaging spectrograph (CHARIS) for the subaru telescope. In
Proc. SPIE, volume 8446, page 84467U, 2012.
[19] M. McElwain, T. Brandt, M. Janson, G. Knapp, M.A. Peters, A. Burrows, A. Carlotti, M. Carr, T.D. Groff, J. Gunn, O. Guyon, M. Hayashi, N.J. Kasdin, M. Kuzuhara,
R. Lupton, F. Martinache, D. Spiegel, N. Takato, M. Tamura, E. Turner, and R. Vanderbei. Scientific design of a high contrast integral field spectrograph for the subaru
telescope. In Proc. SPIE, volume 8446, page 84469C, 2012.
[20] T. Groff and N.J. Kasdin. Optimal wavefront estimation and control using adaptive
techniques. In Aerospace Conference, 2012 IEEE, pages 1–9. IEEE, 2012.
[21] T.D. Groff and N.J. Kasdin. Designing an optimal estimator for more efficient wavefront correction. In Proc. SPIE, volume 8151, page 81510X, 2011.
[22] T.D. Groff, A. Carlotti, and N.J. Kasdin. Progress on broadband control and deformable mirror tolerances in a 2-dm system. In Proc. SPIE, volume 8151, page
81510Z, 2011.
[23] N.J. Kasdin, T. Groff, A. Carlotti, and R. Vanderbei. Space-based planet detection
using two mems dms and a shaped pupil. In Proc. SPIE, volume 8253, page 825303,
2012.
[24] N.J. Kasdin, A. Carlotti, L. Pueyo, T. Groff, and R. Vanderbei. Unified coronagraph
and wavefront control design. In Proc. SPIE, volume 8151, page 81510Y, 2011.
[25] O. Guyon, F. Martinache, C. Clergeon, R. Russell, T. Groff, and V. Garrel. Wavefront control with subaru coronagraphic extreme adaptive optics (scexao) system. In
Proc. SPIE, volume 8149, page 814908, 2011.
[26] F. Martinache, O. Guyon, V. Garrel, C. Clergeon, T. Groff, P. Stewart, R. Russell,
and C. Blain. The subaru coronagraphic extreme ao project: progress report. In Proc.
SPIE, volume 8151, page 81510Q, 2011.
[27] V. Garrel, O. Guyon, P. Baudoz, F. Martinache, P. Stewart, J. Lozi, and T. Groff.
The subaru coronagraphic extreme ao (scexao) system: fast visible imager. In Proc.
SPIE, volume 8151, page 81510R, 2011.
[28] T. D. Groff, A. Carlotti, and N. J. Kasdin. Progress on broadband control and
deformable mirror tolerances in a 2-dm system. In Proceedings of Spirit of Lyot 2010,
2010.
[29] D. Savransky, T. D. Groff, and N. J. Kasdin. Experimental verification of bayesian
planet detection algorithms with a shaped pupil coronagraph. In Proceedings of Spirit
of Lyot 2010, 2010.
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[30] T.D. Groff, A. Carlotti, and N.J. Kasdin. Progress on broadband control and deformable mirror tolerances in a 2-dm system. In Proc. SPIE, volume 7731, page
77314S, 2010.
[31] L. Pueyo, S.B. Shaklan, A. Give’On, M. Troy, N.J. Kasdin, J. Kay, T. Groff, M. McElwain, and R. Soummer. Correction of quasi-static wavefront errors for elt with two
sequential dms. In Adaptative Optics for Extremely Large Telescopes, volume 1, page
5009, 2010.
[32] T.D. Groff, N.J. Kasdin, and L. Pueyo. Broadband correction for high contrast
imaging using two deformable mirrors in series. In Adaptive Optics: Methods, Analysis
and Applications. Optical Society of America, 2009.
[33] J. Kay, T.D. Groff, and N.J. Kasdin. Two-camera wavefront estimation with a
gercheberg-saxton based scheme. In Proc. SPIE, volume 7440, page 74400C, 2009.
[34] E. Cady, K. Balasubramanian, M. Carr, M. Dickie, P. Echternach, T. Groff, J. Kasdin, C. Laftchiev, M. McElwain, D. Sirbu, et al. Progress on the occulter experiment
at princeton. In Proc. SPIE, volume 7440, page 744006, 2009.
Service
Professional Societies
• Session Chair, SPIE, 2015
Volunteer Work
• Guest Teacher, June 2009 - present
Outdoor Education Lab School, Jefferson County Public Schools, Colorado
Skills
Hardware and Software
• Extensive experience with design, assembly, and alignment of optical/mechanical systems, optical fiber technology, and deformable mirrors
• Experience with machine shop tools, various electrical, computer, and camera systems
• MATLAB, Mathematica, MathCAD, and LabView, AMPL and Python
• CREO Parametric, AutoCAD, and ZEMAX
• Clean room operation, layout, maintenance for optical instrumentation
• Operation and layout of vacuum systems
• Cryogenic instrumentation using closed cycle crycoolers
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