Dr. Joseph D. Long Profile

Dr. Joseph D. Long

Research Fellow at Flatiron Institute

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 6 October 2023 Presentation

Presentation

MagAO-X: a pathfinder for GMT to operate extreme adaptive optics at the photon noise limit

Sebastiaan Haffert, Jared Males, Laird Close, Olivier Guyon, Joseph Long, Alexander Hedglen, Maggie Kautz, Kyle Van Gorkom, Avalon McLeod, Warren Foster, Eden McEwen, Logan Pearce, Jialin Li, Jay Kueny, Ben Mazin, Noah Swimmer, Jeb Bailey, Sarah Steiger

Proceedings Volume 12680, 1268008 (2023) https://doi.org/10.1117/12.2677533

KEYWORDS: Coronagraphy, Adaptive optics, Planets, Equipment, Reflection, Imaging systems, Wavefront sensors, Telescopes, Stars, Exoplanetary science

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Proceedings Article | 3 October 2023 Presentation + Paper

Presentation + Paper

The MAPS adaptive secondary mirror: first light, laboratory work, and achievements

Jess Johnson, Amali Vaz, Manny Montoya, Narsireddy Anugu, Cameron Ard, Jared Carlson, Kimberly Chapman, Olivier Durney, Chuck Fellows, Andrew Gardner, Olivier Guyon, Buell Jannuzi, Ron Jones, Craig Kulesa, Joseph Long, Eden McEwen, Jared Males, Emily Mailhot, Jorge Sanchez, Surresh Sivanandam, Robin Swanson, Jacob Taylor, Dan Vargas, Grant West, Jennifer Patience, Katie Morzinski

Proceedings Volume 12693, 126930F (2023) https://doi.org/10.1117/12.2677896

KEYWORDS: Actuators, Mirrors, Telescopes, Adaptive optics, Adaptive mirrors, Power consumption, Matrices, Safety, Engineering

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SPIE Journal Paper | 18 October 2022

Three-sided pyramid wavefront sensor, part II: preliminary demonstration on the new comprehensive adaptive optics and coronagraph test instrument testbed

Lauren Schatz, Johanan Codona, Joseph Long, Jared Males, Weslin Pullen, Jennifer Lumbres, Kyle Van Gorkom, Vincent Chambouleyron, Laird Close, Carlos Correia, Olivier Fauvarque, Thierry Fusco, Olivier Guyon, Michael Hart, Pierre Janin-Potiron, Robert Johnson, Nemanja Jovanovic, Mala Mateen, Jean-François Sauvage, Benoit Neichel

JATIS, Vol. 8, Issue 04, 049001, (October 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.4.049001

KEYWORDS: Adaptive optics, Turbulence, Point spread functions, Wavefront sensors, Modulation, Cameras, Wavefronts, Mirrors, Calibration, Sensors

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Proceedings Article | 30 August 2022 Poster + Paper

Poster + Paper

Advanced wavefront sensing and control demonstration with MagAO-X

Sebastiaan Haffert, Jared Males, Kyle Van Gorkom, Laird Close, Joseph Long, Alexander Hedglen, Kyohoon Ahn, Olivier Guyon, Lauren Schatz, Maggie Kautz, Jennifer Lumbres, Alexander Rodack, Justin Knight, He Sun, Kevin Fogarty, Kelsey Miller

Proceedings Volume 12185, 1218581 (2022) https://doi.org/10.1117/12.2630425

KEYWORDS: Wavefront sensors, Planets, Adaptive optics, Coronagraphy, Exoplanets, Autoregressive models

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Proceedings Article | 30 August 2022 Presentation + Paper

Presentation + Paper

First lab results of segment/petal phasing with a pyramid wavefront sensor and a novel holographic dispersed fringe sensor (HDFS) from the Giant Magellan Telescope high contrast adaptive optics phasing testbed

Alexander Hedglen, Laird Close, Sebastiaan Haffert, Jared Males, Maggie Kautz, Antonin Bouchez, Richard Demers, Fernando Quirós-Pacheco, Breann Sitarski, Olivier Guyon, Kyle Van Gorkom, Joseph Long, Jennifer Lumbres, Lauren Schatz, Kelsey Miller, Alex Rodack, Justin Knight

Proceedings Volume 12185, 1218516 (2022) https://doi.org/10.1117/12.2629538

KEYWORDS: Sensors, Adaptive optics, Point spread functions, Image segmentation, Modulation, Turbulence, Mirrors, Coronagraphy, Wavefront sensors, Telescopes

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The Giant Magellan Telescope (GMT) design consists of seven circular 8.4-m diameter mirror segments that are separated by large > 30 cm gaps, making them susceptible to fluctuations in optical path differences (piston) due to flexure, segment vibrations, wind buffeting, temperature effects, and atmospheric seeing. If we wish to utilize the full 25.4-m diffractionlimited aperture of the GMT for high-contrast natural guide star adaptive optics (NGSAO) science (e.g., direct imaging of habitable zone earth-like planets around late type stars), the seven mirror segments must be co-phased to well within a fraction of a wavelength. The current design of the GMT involves seven adaptive secondary mirrors, a dispersed fringe sensor, and a pyramid wavefront sensor (PyWFS) to measure and correct the total path length between segment pairs, but these methods need to be tested “end-to-end” in a lab environment if we hope to officially retire the GMT high risk item of phasing performance. We present the design and working prototype of a “GMT High-Contrast Adaptive Optics phasing Testbed” (p-HCAT) which leverages the existing MagAO-X ExAO instrument to demonstrate segment phase sensing and simultaneous AO-control for high-contrast GMT NGSAO science. We present the first test results of closed-loop piston control with one GMT segment using MagAO-X’s PyWFS and a novel Holographic Dispersed Fringe Sensor (HDFS) with and without simulated atmospheric turbulence. We show that the PyWFS alone was able to successfully control piston without turbulence within 12-33 nm RMS for 0 λ/D – 5 λ/D modulation, but was unsuccessful at controlling segmented piston with generated ∼ 0.6 arcsec and ∼ 1.2 arcsec seeing turbulence due to non-linear modal cross-talk and poor pixel sampling of the segment gaps on the PyWFS detector. We report the success of an alternate solution to control segmented piston using the novel HDFS while controlling all other modes with the PyWFS purely as a slope sensor (piston mode removed). This “second channel” WFS method worked well to control piston to within 50 nm RMS and ± 10 μm dynamic range under simulated 0.6 arcsec and 1.2 arcsec atmospheric seeing conditions. These results suggest that a PyWFS alone is not an ideal piston sensor for the GMT and likely other Giant Segmented Mirror Telescopes (GSMTs) as well. Therefore, an additional “second channel” piston sensor, such as the novel HDFS, is strongly suggested.

Proceedings Article | 30 August 2022 Presentation + Paper

Presentation + Paper

MagAO-X: current status and plans for Phase II

Jared Males, Laird Close, Sebastiaan Haffert, Joseph Long, Alexander Hedglen, Logan Pearce, Alycia Weinberger, Olivier Guyon, Justin Knight, Avalon McLeod, Maggie Kautz, Kyle Van Gorkom, Jennifer Lumbres, Lauren Schatz, Alex Rodack, Victor Gasho, Jay Kueny, Warren Foster

Proceedings Volume 12185, 1218509 (2022) https://doi.org/10.1117/12.2630584

KEYWORDS: Coronagraphy, Adaptive optics, Telescopes, Algorithm development, Actuators, Imaging systems, Wavefront sensors, Planets, Stars

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Proceedings Article | 30 August 2022 Presentation + Paper

Presentation + Paper

Experimental trials with the optical differentiation wavefront sensor for extended objects

Meghan Farris O'Brien, Sebastiaan Haffert, Joseph Long, Lauren Schatz, Jared Males, Kyle Van Gorkom, Alex Rodack

Proceedings Volume 12185, 121851J (2022) https://doi.org/10.1117/12.2629485

KEYWORDS: Wavefront sensors, Beam splitters, Calibration, Adaptive optics, Wavefronts, Polarization, Prisms, Optical filters, Point spread functions, Linear filtering

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Proceedings Article | 30 August 2022 Poster + Paper

Poster + Paper

XPipeline: starlight subtraction at scale for MagAO-X

Joseph Long, Jared Males, Sebastiaan Haffert, Laird Close, Katie Morzinski, Kyle Van Gorkom, Jennifer Lumbres, Warren Foster, Alexander Hedglen, Maggie Kautz, Alex Rodack, Lauren Schatz, Kelsey Miller, David Doelman, Steven Bos, Matthew Kenworthy, Frans Snik, Gilles P. P. Otten

Proceedings Volume 12185, 121853P (2022) https://doi.org/10.1117/12.2628975

KEYWORDS: Adaptive optics, Control systems, Human-machine interfaces, Telescopes, Real-time computing, Observatories, Image processing, Deformable mirrors, Data acquisition, Wavefront sensors

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Proceedings Article | 29 August 2022 Presentation

Presentation

Experimental demonstration of a three-sided pyramid wavefront sensor on the CACTI testbed

Lauren Schatz, Johanan Codona, Joseph Long, Jared Males, Weslin Pullen, Kyle Van Gorkom, Vincent Chambouleyron, Laird Close, Carlos Correia, Olivier Fauvarque, Thierry Fusco, Olivier Guyon, Michael Hart, Pierre Janin-Potiron, Robert Johnson, Nemanja Jovanovic, Jennifer Lumbres, Mala Mateen, Jean-François Sauvage, Benoît Neichel

Proceedings Volume 12185, 121852D (2022) https://doi.org/10.1117/12.2629500

KEYWORDS: Wavefront sensors, Sensors, Optics manufacturing, Adaptive optics, Wavefronts, Turbulence, Telescopes, Space telescopes, Signal processing, Segmented mirrors

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SPIE Journal Paper | 24 June 2022

Lab tests of segment/petal phasing with a pyramid wavefront sensor and a holographic dispersed fringe sensor in turbulence with the Giant Magellan Telescope high contrast adaptive optics phasing testbed

Alexander Hedglen, Laird Close, Sebastiaan Haffert, Jared Males, Maggie Kautz, Antonin Bouchez, Richard Demers, Fernando Quirós-Pacheco, Breann Sitarski, Olivier Guyon, Kyle Van Gorkom, Joseph D. Long, Jennifer Lumbres, Lauren Schatz, Kelsey Miller, Alex Rodack, Justin M. Knight

JATIS, Vol. 8, Issue 02, 021515, (June 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.2.021515

KEYWORDS: Mirrors, Sensors, Wavefront sensors, Point spread functions, Wavefronts, Adaptive optics, Lens design, Modulation, Image segmentation, Turbulence

Read Abstract +

The Giant Magellan Telescope (GMT) design consists of seven circular 8.4-m diameter mirrors, together forming a single 25.4-m diameter primary mirror. This large aperture and collecting area can help extreme adaptive optics (ExAO) systems such as GMT’s GMagAO-X achieve the small angular resolutions and contrasts required to image habitable zone earth-like planets around late type stars and possibly lead to the discovery of life outside of our solar system. However, the GMT primary mirror segments are separated by large >30 cm gaps, creating the possibility of fluctuations in optical path differences (piston) due to flexure, segment vibrations, wind buffeting, temperature effects, and atmospheric seeing. To utilize the full diffraction-limited aperture of the GMT for high-contrast, natural guide star-adaptive optics science, the seven mirror segments must be co-phased to well within a fraction of a wavelength. The current design of the GMT involves seven adaptive secondary mirrors, a slow (∼0.03 Hz) off-axis dispersed fringe sensor (part of the acquisition guiding and wavefront sensing system’s active optics off-axis guider), and a pyramid wavefront sensor [PyWFS; part of the natural guide star wavefront sensor (NGWS) adaptive optics] to measure and correct the total path length between segment pairs, but these methods have yet to be tested “end-to-end” in a lab environment. We present the design and working prototype of a “GMT high contrast adaptive optics phasing testbed” that leverages the existing MagAO-X ExAO instrument to demonstrate segment phase sensing and simultaneous AO-control for high-contrast GMT natural guide star science [i.e., testing the NGWS wavefront sensor (WFS) architecture]. We present the first test results of closed-loop piston control with one GMT segment using MagAO-X’s PyWFS with and without simulated atmospheric turbulence. We show that the PyWFS was able to successfully control segment piston without turbulence within 12- to 33-nm RMS for 0 λ / D to 5 λ / D modulation, but was unsuccessful at controlling segment piston with generated ∼0.6 arcsec (median seeing conditions at the GMT site) and ∼1.2 arcsec seeing turbulence due to nonlinear modal cross-talk and poor pixel sampling of the segment gaps on the PyWFS detector. These results suggest that a PyWFS alone is not an ideal piston sensor for the GMT (and likely the TMT and ELT). Hence, a dedicated “second channel” piston sensor is required. We report the success of an alternate solution to control piston using a holographic dispersed fringe sensor (HDFS) while controlling all other modes with the PyWFS purely as a slope sensor (piston mode removed). This “second channel” WFS method worked well to control segment piston to within 50 nm RMS and ±10 μm dynamic range under simulated 0.6 arcsec atmospheric seeing (median seeing conditions at the GMT site). These results led to the inclusion of the HDFS as the official second channel piston sensor for the GMT NGWS WFS. This HDFS + PyWFS architecture should also work well to control piston petal modes on the ELT and TMT telescopes.

SPIE Journal Paper | 22 June 2022

Phasing the Giant Magellan Telescope with the holographic dispersed fringe sensor

Sebastiaan Haffert, Laird Close, Alexander Hedglen, Jared Males, Maggie Kautz, Antonin Bouchez, Richard Demers, Fernando Quirós-Pacheco, Breann Sitarski, Kyle Van Gorkom, Joseph Long, Olivier Guyon, Lauren Schatz, Kelsey Miller, Jennifer Lumbres, Alex Rodack, Justin Knight

JATIS, Vol. 8, Issue 02, 021513, (June 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.2.021513

KEYWORDS: Sensors, Telescopes, Holography, Diffraction gratings, Adaptive optics, Wavefront sensors, Holograms, Point spread functions, Image segmentation, Wavefronts

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SPIE Journal Paper | 13 October 2021

Three-sided pyramid wavefront sensor, part 1: simulations and analysis for astronomical adaptive optics

Lauren Schatz, Jared Males, Carlos Correia, Benoit Neichel, Vincent Chambouleyron, Johanan Codona, Olivier Fauvarque, Jean-François Sauvage, Thierry Fusco, Michael Hart, Pierre Janin-Potiron, Robert Johnson, Joseph Long, Mala Mateen

JATIS, Vol. 7, Issue 04, 049001, (October 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.4.049001

KEYWORDS: Sensors, Wavefronts, Adaptive optics, Wavefront sensors, Modulation, Telescopes, Stars, Signal to noise ratio, Point spread functions, Fourier transforms

Read Abstract +

The Giant Segmented Mirror Telescopes (GSMTs) including the Giant Magellan Telescope (GMT), the Thirty Meter Telescope (TMT), and the European Extremely Large Telescope (E-ELT), all have extreme adaptive optics (ExAO) instruments planned that will use pyramid wavefront sensors (PWFS). The ExAO instruments all have common features: a high-actuator-count deformable mirror running at extreme speeds (>1 kHz); a high-performance wavefront sensor (WFS); and a high-contrast coronagraph. ExAO WFS performance is currently limited by the need for high spatial sampling of the wavefront which requires large detectors. For ExAO instruments for the next generation of telescopes, alternative architectures of WFS are under consideration because there is a trade-off between detector size, speed, and noise that reduces the performance of GSMT-ExAO wavefront control. One option under consideration for a GSMT-ExAO wavefront sensor is a three-sided PWFS (3PWFS). The 3PWFS creates three copies of the telescope pupil for wavefront sensing, compared to the conventional four-sided PWFS (4PWFS), which uses four pupils. The 3PWFS uses fewer detector pixels than the 4PWFS and should therefore be less sensitive to read noise. Here we develop a mathematical formalism based on the diffraction theory description of the Foucault knife-edge test that predicts the intensity pattern after the PWFS. Our formalism allows us to calculate the intensity in the pupil images formed by the PWFS in the presence of phase errors corresponding to arbitrary Fourier modes. We use these results to motivate how we process signals from a 3PWFS. We compare the raw intensity (RI) method, and derive the Slopes Maps (SM) calculation for the 3PWFS, which combines the three pupil images of the 3PWFS to obtain the X and Y slopes of the wavefront. We then use the Object Oriented MATLAB Adaptive Optics toolbox (OOMAO) to simulate an end-to-end model of an AO system using a PWFS with modulation and compare the performance of the 3PWFS to the 4PWFS. In the case of a low read noise detector, the Strehl ratios of the 3PWFS and 4PWFS are within 0.01. When we included higher read noise in the simulation, we found a Strehl ratio gain of 0.036 for the 3PWFS using RI over the 4PWFS using SM at a stellar magnitude of 10. At the same magnitude, the 4PWFS RI also outperformed the 4PWFS SM, but the gain was only 0.012 Strehl. This is significant because 4PWFS using SM is how the PWFS is conventionally used for AO wavefront sensing. We have found that the 3PWFS is a viable WFS that can fully reconstruct a wavefront and produce a stable closed-loop with correction comparable to that of a 4PWFS, with modestly better performance for high read-noise detectors.

Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Data-driven subspace predictive control: lab demonstration and future outlook

Sebastiaan Haffert, Jared Males, Laird Close, Kyle van Gorkom, Joseph Long, Alexander Hedglen, Lauren Schatz, Jennifer Lumbres, Alexander Rodack, Justin Knight, He Sun, Kevin Fogarty, Logan Pearce

Proceedings Volume 11823, 118231C (2021) https://doi.org/10.1117/12.2594910

KEYWORDS: Adaptive optics, Planets, Autoregressive models, Wavefront sensors, Adaptive control

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Proceedings Article | 1 September 2021 Presentation + Paper

Presentation + Paper

Data-driven subspace predictive control: lab demonstration and future outlook

Sebastiaan Haffert, Jared Males, Laird Close, Joseph Long, Lauren Schatz, Kyle van Gorkom, Alexander Hedglen, Jennifer Lumbres, Alexander Rodack, Olivier Guyon, Justin Knight, Maggie Kautz, Logan Pearce

Proceedings Volume 11823, 1182306 (2021) https://doi.org/10.1117/12.2594875

KEYWORDS: Adaptive optics, Telescopes, Spectrographs, Reconstruction algorithms, Planets, Autoregressive models, Wavefronts, Stars, Actuators, Wavefront sensors

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SPIE Journal Paper | 2 August 2021

Characterizing deformable mirrors for the MagAO-X instrument

Kyle Van Gorkom, Jared Males, Laird Close, Jennifer Lumbres, Alex Hedglen, Joseph Long, Sebastiaan Haffert, Olivier Guyon, Maggie Kautz, Lauren Schatz, Kelsey Miller, Alexander Rodack, Justin Knight, Katie Morzinski

JATIS, Vol. 7, Issue 03, 039001, (August 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.3.039001

KEYWORDS: Actuators, Point spread functions, Deformable mirrors, Wavefronts, Cameras, Interferometers, Adaptive optics, Telescopes, Microelectromechanical systems, Coronagraphy

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SPIE Journal Paper | 6 April 2021

Data-driven subspace predictive control of adaptive optics for high-contrast imaging

Sebastiaan Haffert, Jared Males, Laird Close, Kyle Van Gorkom, Joseph Long, Alexander Hedglen, Olivier Guyon, Lauren Schatz, Maggie Kautz, Jennifer Lumbres, Alexander Rodack, Justin Knight, He Sun, Kevin Fogarty

JATIS, Vol. 7, Issue 02, 029001, (April 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.029001

KEYWORDS: Adaptive optics, Point spread functions, Adaptive control, Autoregressive models, Device simulation, Wavefronts, Wavefront sensors, Data modeling, Actuators, Turbulence

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

Prediction of the planet yield of the MaxProtoPlanetS high-contrast survey for H-alpha protoplanets with MagAO-X based on first light contrasts

Laird Close, Jared Males, Joseph Long, Kyle Van Gorkom, Alexander Hedglen, Maggie Kautz, Jennifer Lumbres, Sebastiaan Haffert, Katherine Follette, Kevin Wagner, Kelsey Miller, Daniel Apai, Ya-Lin Wu, Olivier Guyon, Lauren Schatz, Alex Rodack, David Doelman, Frans Snik, Justin Knight, Katie Morzinski, Victor Gasho, Christoph Keller, Logan Pearce, Alycia Weinberger, Laura Pérez, René Doyon

Proceedings Volume 11448, 114480U (2020) https://doi.org/10.1117/12.2561677

KEYWORDS: Imaging systems, Adaptive optics, Cameras, Actuators, Exoplanets, Planets, Hydrogen, Magnetism, Stars, Coronagraphy

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Proceedings Article | 13 December 2020 Presentation

Presentation

First results of laboratory tests of a three-sided pyramid wavefront sensor

Lauren Schatz, Jared Males, Johanan Codona, Weslin Pullen, Michael Hart, Jennifer Lumbres, Benoit Neichel, Carlos Correia, Thierry Fusco, Vincent Chambouleyron, Pierre Janin-Poitron, Kyle Van Gorkom, Mala Mateen, Joseph Long, Chris Bohlman, Olivier Favarque

Proceedings Volume 11448, 114481R (2020) https://doi.org/10.1117/12.2562673

KEYWORDS: Wavefront sensors, Adaptive optics, Large telescopes, Control systems, Wavefront aberrations, MATLAB, Coronagraphy, Optical testing, Wavefronts

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

MagAO-X first light

Jared Males, Laird Close, Olivier Guyon, Alexander Hedglen, Kyle Van Gorkom, Joseph Long, Maggie Kautz, Jennifer Lumbres, Lauren Schatz, Alexander Rodack, Kelsey Miller, David Doelman, Frans Snik, Steven Bos, Justin Knight, Katie Morzinski, Victor Gasho, Christoph Keller, Sebastiaan Haffert, Logan Pearce

Proceedings Volume 11448, 114484L (2020) https://doi.org/10.1117/12.2561682

KEYWORDS: Coronagraphy, Adaptive optics, Imaging systems, Liquid crystal on silicon, Wavefront sensors, Telescopes, Lanthanum, Observatories, Deformable mirrors, Microelectromechanical systems

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Proceedings Article | 17 August 2018 Paper

Paper

Making good use of JWST's coronagraphs: tools and strategies from a user's perspective

Julien Girard, William Blair, Brian Brooks, Keira Brooks, Robert Brown, Howard Bushouse, Alicia Canipe, Christine Chen, Matteo Correnti, J. Brendan Hagan, Bryan Hilbert, Dean Hines, Jarron Leisenring, Joseph Long, Bryony Nickson, Marshall Perrin, Klaus Pontoppidan, Laurent Pueyo, Abhijith Rajan, Adric Riedel, Remi Soummer, John Stansberry, Christopher Stark, Kyle Van Gorkom, Brian York

Proceedings Volume 10698, 106983V (2018) https://doi.org/10.1117/12.2314198

KEYWORDS: Coronagraphy, Point spread functions, James Webb Space Telescope, Stars, Signal to noise ratio, Exoplanets, Calibration, Visibility, Space telescopes, Device simulation

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Design of the MagAO-X pyramid wavefront sensor

Lauren Schatz, Jared Males, Laird Close, Olivier Durney, Olivier Guyon, Michael Hart, Jennifer Lumbres, Kelsey Miller, Justin Knight, Alexander Rodack, Joseph Long, Kyle Van Gorkom, Madison Jean, Maggie Kautz

Proceedings Volume 10703, 1070321 (2018) https://doi.org/10.1117/12.2312171

KEYWORDS: Wavefront sensors, Lens design, Zemax, Cameras, Adaptive optics, Optical alignment

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

MagAO-X: project status and first laboratory results

Jared Males, Laird Close, Kelsey Miller, Lauren Schatz, David Doelman, Jennifer Lumbres, Frans Snik, Alex Rodack, Justin Knight, Kyle Van Gorkom, Joseph Long, Alex Hedglen, Maggie Kautz, Nemanja Jovanovic, Katie Morzinski, Olivier Guyon, Ewan Douglas, Katherine Follette, Julien Lozi, Chris Bohlman, Olivier Durney, Victor Gasho, Phil Hinz, Michael Ireland, Madison Jean, Christoph Keller, Matt Kenworthy, Ben Mazin, Jamison Noenickx, Dan Alfred, Kevin Perez, Anna Sanchez, Corwynn Sauve, Alycia Weinberger, Al Conrad

Proceedings Volume 10703, 1070309 (2018) https://doi.org/10.1117/12.2312992

KEYWORDS: Coronagraphy, Stars, Telescopes, Adaptive optics, Planets, Wavefronts, Computing systems, Observatories

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Proceedings Article | 10 July 2018 Paper

Paper

The hunt for Sirius Ab: comparison of algorithmic sky and PSF estimation performance in deep coronagraphic thermal-IR high contrast imaging

Joseph Long, Jared Males, Katie Morzinski, Laird Close, Frans Snik, Matthew Kenworthy, Gilles P. Otten, John Monnier, Volker Tolls, Alycia Weinberger

Proceedings Volume 10703, 107032T (2018) https://doi.org/10.1117/12.2312874

KEYWORDS: Point spread functions, Coronagraphy, Stray light, Sensors, Telescopes, Stars, Principal component analysis, Exoplanets, Imaging systems, Observatories

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Proceedings Article | 5 September 2017 Paper

Paper

James Webb Space Telescope optical simulation testbed IV: linear control alignment of the primary segmented mirror

Sylvain Egron, Rémi Soummer, Charles-Philippe Lajoie, Aurélie Bonnefois, Joseph Long, Vincent Michau, Elodie Choquet, Marc Ferrari, Lucie Leboulleux, Olivier Levecq, Johan Mazoyer, Mamadou N'Diaye, Marshall Perrin, Peter Petrone, Laurent Pueyo, Anand Sivaramakrishnan

Proceedings Volume 10398, 1039811 (2017) https://doi.org/10.1117/12.2272981

KEYWORDS: Wavefronts, James Webb Space Telescope, Segmented mirrors, Wavefront sensors, Space telescopes, Optical alignment, Mirrors, Optical simulations, Optical testing, Telescopes

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Proceedings Article | 19 July 2016 Paper

Paper

Preparing for JWST wavefront sensing and control operations

Marshall Perrin, D. Scott Acton, Charles-Philippe Lajoie, J. Scott Knight, Matthew Lallo, Marsha Allen, Wayne Baggett, Elizabeth Barker, Thomas Comeau, Eric Coppock, Bruce Dean, George Hartig, William Hayden, Margaret Jordan, Alden Jurling, Trey Kulp, Joseph Long, Michael McElwain, Luis Meza, Edmund Nelan, Remi Soummer, John Stansberry, Christopher Stark, Randal Telfer, Andria Welsh, Thomas Zielinski, Neil Zimmerman

Proceedings Volume 9904, 99040F (2016) https://doi.org/10.1117/12.2233104

KEYWORDS: James Webb Space Telescope, Wavefront sensors, Space telescopes, Observatories, Image segmentation, Stars, Point spread functions, Wavefronts, Space operations, Mirrors

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Proceedings Article | 21 July 2014 Paper

Paper

KAPAO first light: the design, construction and operation of a low-cost natural guide star adaptive optics system

Scott Severson, Philip Choi, Katherine Badham, Dalton Bolger, Daniel Contreras, Blaine Gilbreth, Christian Guerrero, Erik Littleton, Joseph Long, Lorcan McGonigle, William Morrison, Fernando Ortega, Alex Rudy, Jonathan Wong, Erik Spjut, Christoph Baranec, Reed Riddle

Proceedings Volume 9148, 914839 (2014) https://doi.org/10.1117/12.2056961

KEYWORDS: Adaptive optics, Telescopes, Cameras, Mirrors, Microelectromechanical systems, Time multiplexed optical shutter, Computer aided design, Wavefront sensors, Control systems, Optical instrument design

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Showing 5 of 26 publications

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