Dr. Jaren N. Ashcraft Profile

Dr. Jaren N. Ashcraft

NASA Hubble Fellow at University of California, Santa Barbara

SPIE Involvement:

Author

Publications (31)

Proceedings Article | 28 August 2024 Presentation + Paper

Presentation + Paper

Polarimetric, non-redundant aperture masking with next generation VAMPIRES: new instrumental capabilities, scientific outcomes, and image reconstruction techniques

Lucinda Lilley, Barnaby Norris, Peter Tuthill, Eckhart Spalding, Miles Lucas, Manxuan Zhang, Michael Bottom, Maxwell Millar-Blanchaer, Boris Safonov, Olivier Guyon, Julien Lozi, Vincent Deo, Sébastien Vievard, Kyohoon Ahn, Jaren Ashcraft

Proceedings Volume 13095, 1309510 (2024) https://doi.org/10.1117/12.3018210

KEYWORDS: Polarimetry, Machine learning, Reconstruction algorithms, Physics, Optical interferometry, Astronomical interferometry, Interferometry, Visibility

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Proceedings Article | 26 August 2024 Paper

Paper

High-contrast imaging at first light of the GMT: optimized coatings enabling high-throughput observations for GMagAO-X

Jaren Ashcraft, Sebastiaan Haffert, Laird Close, Olivier Durney, Jared Males, Maggie Kautz

Proceedings Volume 13100, 1310065 (2024) https://doi.org/10.1117/12.3020707

KEYWORDS: Design, Optical coatings, Coronagraphy, Polarization, Thin films, Silver, Reflectivity, Magnesium fluoride, Multilayers, Silica

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

The space coronagraph optical bench (SCoOB): 5. End-to-end simulation of polarization aberrations

Ramya Anche, Kyle Van Gorkom, Jaren Ashcraft, Ewan Douglas, Emory Jenkins, Sebastiaan Haffert, Maxwell Millar-Blanchaer

Proceedings Volume 13092, 130926M (2024) https://doi.org/10.1117/12.3020630

KEYWORDS: Polarization, Circular polarizers, Coronagraphy, Pupil aberrations, Mueller matrices, Ray tracing

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

High-contrast polarimetric observations of debris disks through the Roman Coronagraph Instrument

Ramya Anche, Kian Milani, David Doelman, Justin Hom, Maxwell Millar-Blanchaer, Schuyler Wolff, Ewan Douglas, Frans Snik, Jaren Ashcraft

Proceedings Volume 13092, 1309257 (2024) https://doi.org/10.1117/12.3020643

KEYWORDS: Polarization, Coronagraphy, Polarimetry, Convolution

Read Abstract +

Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

The space coronagraph optical bench (SCoOB): 4. Vacuum performance of a high contrast imaging testbed

Kyle Van Gorkom, Ewan Douglas, Kian Milani, Jaren Ashcraft, Ramya Anche, Emory Jenkins, Patrick Ingraham, Sebastiaan Haffert, Daewook Kim, Heejoo Choi, Olivier Durney

Proceedings Volume 13092, 1309222 (2024) https://doi.org/10.1117/12.3020654

KEYWORDS: Coronagraphy, Cameras, Actuators, Sensors, Optical benches, Calibration, Polarization, Reflection

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

The space coronagraph optical bench (SCoOB): 3. Mueller matrix polarimetry of a coronagraphic exit pupil

Jaren Ashcraft, Ewan Douglas, Ramya Anche, Kyle Van Gorkom, Emory Jenkins, William Melby, Maxwell Millar-Blanchaer

Proceedings Volume 13092, 130926K (2024) https://doi.org/10.1117/12.3019204

KEYWORDS: Mueller matrices, Polarization, Polarimetry, Coronagraphy, Pupil aberrations, Calibration, Wave plates, Depolarization, Polysomnography, Equipment

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

Theoretical limits on polarization differential imaging for the GSMTs imposed by polarization aberrations

Jaren Ashcraft, Maxwell Millar-Blanchaer, Ewan Douglas, Ramya Anche, Justin Hom

Proceedings Volume 13099, 130992F (2024) https://doi.org/10.1117/12.3019195

KEYWORDS: Polarization, Simulations, Adaptive optics, Gemini Planet Imager, Wavefront aberrations, Coronagraphy, Polarization imaging, Wavefront errors, Telescopes, Speckle

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Proceedings Article | 20 August 2024 Poster + Paper

Poster + Paper

Visible-light high-contrast imaging polarimetry at Subaru

Miles Lucas, Barnaby Norris, Olivier Guyon, Michael Bottom, Vincent Deo, Sébastien Vievard, Julien Lozi, Kyohoon Ahn, Jaren Ashcraft, Thayne Currie, David Doelman, Tomoyuki Kudo, Lucinda Lilley, Lucie Leboulleux, Maxwell Millar-Blanchaer, Boris Safonov, Peter Tuthill, Taichi Uyama, Aidan Walk, Manxuan Zhang

Proceedings Volume 13096, 130962Z (2024) https://doi.org/10.1117/12.3016188

KEYWORDS: Polarimetry, Sensors, Coronagraphy, High dynamic range imaging, Equipment, Stars, Polarization, Adaptive optics, Neptune, Multispectral imaging

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Proceedings Article | 29 July 2024 Paper

Paper

Developing an instrumental polarization characterization routine for SCExAO VAMPIRES

Manxuan Zhang, Maxwell Millar-Blanchaer, Boris Safonov, Miles Lucas, Lucinda Lilley, Jaren Ashcraft, Barnaby Norris, Julien Lozi, Olivier Guyon, Michael Bottom, Peter Tuthill

Proceedings Volume 13096, 1309630 (2024) https://doi.org/10.1117/12.3019283

KEYWORDS: Mueller matrices, Polarization, Equipment, Calibration, Matrices, Polarimetry, Instrument modeling, Error analysis, Stars, Cameras

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Proceedings Article | 18 July 2024 Poster + Paper

Poster + Paper

Half-wave plate characterizations for the Keck NIRC2 polarimetry mode

William Melby, Manxuan Zhang, Maxwell Millar-Blanchaer, Anthony Manni, Douglas Hobbs, Jaren Ashcraft

Proceedings Volume 13096, 1309637 (2024) https://doi.org/10.1117/12.3019556

KEYWORDS: Mueller matrices, Wave plates, Polarimetry, Polarization, Calibration, Quartz, Matrices, Sensors

Read Abstract +

SPIE Journal Paper | 16 November 2023 Open Access

Open Access

Hybrid propagation physics for the design and modeling of astronomical observatories: a coronagraphic example

Jaren Ashcraft, Ewan Douglas, Daewook Kim, A. J. Eldorado Riggs

JATIS, Vol. 9, Issue 04, 048003, (November 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.4.048003

KEYWORDS: Matrices, Point spread functions, Diffraction, Modeling, Observatories, Ray tracing, Coronagraphy, Physics, Gaussian beams, Design

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

Characterizing the instrumental polarization of SCExAO VAMPIRES

Manxuan Zhang, Maxwell Millar-Blanchaer, Boris Safonov, Miles Lucas, Lucinda Lilley, Jaren Ashcraft, Barnaby Norris, Julien Lozi, Olivier Guyon, Michael Bottom

Proceedings Volume 12680, 126800S (2023) https://doi.org/10.1117/12.2677599

KEYWORDS: Polarization, Mueller matrices, Polarimetry, Equipment, Cameras, Visibility, Instrument modeling, Calibration, Data modeling, Ferroelectric materials

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Reflective lyot stop low-order wavefront control for future large space telescope coronagraphs

Christopher Mendillo, Jaren Ashcraft, Kevin Zhang Derby, Ewan Douglas, Daewook Kim, Jared Males

Proceedings Volume 12680, 126802E (2023) https://doi.org/10.1117/12.2677654

KEYWORDS: Wavefront errors, Telescopes, Coronagraphy, Wavefronts, Space telescopes, Exoplanets, Sensors, Optical simulations, Device simulation, Deformable mirrors

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

Estimation of polarization aberrations and their effect on the coronagraphic performance for future space telescopes

Ramya Anche, Sebastiaan Haffert, Jaren Ashcraft, Kian Milani, Kyle Van Gorkom, Kevin Derby, Ewan Douglas, Maxwell Millar-Blanchaer

Proceedings Volume 12680, 126800R (2023) https://doi.org/10.1117/12.2677486

KEYWORDS: Coating, Coronagraphy, Polarization, Telescopes, Mirrors, Reflection, Polarization analysis

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Proceedings Article | 3 October 2023 Presentation + Paper

Presentation + Paper

Polarimetric modeling and assessment of science cases for Giant Magellan Telescope-Polarimeter (GMT-Pol)

Ramya Anche, Grant Williams, Hill Tailor, Chris Packham, Daewook Kim, Jaren Ashcraft, Ewan Douglas

Proceedings Volume 12690, 126900F (2023) https://doi.org/10.1117/12.2676777

KEYWORDS: Polarization, Polarimetry, Telescopes, Crosstalk, Modeling, Mirrors, Design and modelling, Spectrographs, Polarization analysis

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Proceedings Article | 28 September 2023 Presentation + Paper

Presentation + Paper

Poke: an open-source, ray-based physical optics platform

Jaren Ashcraft, Ewan Douglas, Daewook Kim, A. J. Riggs, Ramya Anche, Trent Brendel, Kevin Derby, Brandon Dube, Quinn Jarecki, Emory Jenkins, Kian Milani

Proceedings Volume 12664, 1266404 (2023) https://doi.org/10.1117/12.2678001

KEYWORDS: Ray tracing, Polarization, Diffraction, Modeling, Thin films, Interfaces, Simulations, Design and modelling, Wavefronts, Telescopes

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Proceedings Article | 3 October 2022 Open Access

Open Access

Paper

The practical optics workshop: educating the optical engineers of tomorrow

Jaren N. Ashcraft, Trenton Brendel, Simran Agarwal, Joel Berkson, Alexander Hedglen, Hyukmo Kang, Yanqi Zhang, Heejoo Choi, Daewook Kim

Proceedings Volume 12213, 122130H (2022) https://doi.org/10.1117/12.2632801

KEYWORDS: Optics education, Education and training, Optical design, Optical engineering, Optical design software

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Curved primary aperture segmentation enabling a robust quasi-Airy pattern point spread function

Kevin Z. Derby, James B. Breckinridge, James E. Harvey, Tony Hull, Charles F. Lillie, Jaren N. Ashcraft, Heejoo Choi, Ewan S. Douglas, Daewook Kim

Proceedings Volume 12188, 121880N (2022) https://doi.org/10.1117/12.2628819

KEYWORDS: Point spread functions, Coronagraphy, Diffraction, Wavefronts, Telescopes, Mirrors, Wave propagation, Performance modeling, Observatories

Read Abstract +

Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

Tolerance analysis of a self-coherent camera for wavefront sensing and dark hole maintenance

Kevin Derby, Sebastiaan Haffert, Jaren Ashcraft, Kian Milani, Heejoo Choi, Young-Sik Kim, Laird Close, Christopher Mendillo, Supriya Chakrabarti, Gregory Allan, Leonid Pogorelyuk, Kerri Cahoy, Mamadou N'Diaye, Daewook Kim, Jared Males, Ewan Douglas

Proceedings Volume 12180, 1218069 (2022) https://doi.org/10.1117/12.2629578

KEYWORDS: Wavefronts, Sensors, Coronagraphy, Wavefront sensors, Tolerancing, Cameras, Stars, Telescopes, Photodetectors, Error analysis

Read Abstract +

Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

Simulations of polarimetric observations of debris disks through the Roman Coronagraph Instrument

Ramya Anche, Ewan Douglas, Kian Milani, Jaren Ashcraft, John Debes

Proceedings Volume 12180, 1218056 (2022) https://doi.org/10.1117/12.2629497

KEYWORDS: Polarization, Mathematical modeling, Polarimetry, Point spread functions, Coronagraphy, Light scattering, Electron multiplying charge coupled devices, Device simulation

Read Abstract +

Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

The space coronagraph optical bench (SCoOB): 2. Wavefront sensing and control in a vacuum-compatible coronagraph testbed for spaceborne high-contrast imaging technology

Kyle Van Gorkom, Ewan Douglas, Jaren Ashcraft, Sebastiaan Haffert, Daewook Kim, Heejoo Choi, Ramya Anche, Jared Males, Kian Milani, Kevin Derby, Lori Harrison, Olivier Durney

Proceedings Volume 12180, 121805M (2022) https://doi.org/10.1117/12.2630704

KEYWORDS: Coronagraphy, Wavefronts, Wavefront sensors, Actuators, Optical benches, Astronomical imaging, Cameras, Point spread functions, Imaging technologies, Light scattering

Read Abstract +

Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

The space coronagraph optical bench (SCoOB): 1. Design and assembly of a vacuum-compatible coronagraph testbed for spaceborne high-contrast imaging technology

Jaren Ashcraft, Heejoo Choi, Ewan Douglas, Kevin Derby, Kyle Van Gorkom, Daewook Kim, Ramya Anche, Alex Carter, Olivier Durney, Sebastiaan Haffert, Lori Harrison, Maggie Kautz, Jennifer Lumbres, Jared Males, Kian Milani, Oscar Montoya, George Smith

Proceedings Volume 12180, 121805L (2022) https://doi.org/10.1117/12.2628855

KEYWORDS: Coronagraphy, Wavefronts, Mirrors, Interferometers, Wavefront sensors, Point spread functions, Optical benches, Cameras, Astronomical imaging

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Proceedings Article | 24 August 2021 Presentation + Paper

Presentation + Paper

Cosmic evolution through UV surveys (CETUS): point spread function analysis of three mirror anastigmat telescope

Jaren Ashcraft, Heejoo Choi, Sara Heap, Robert Woodruff, Dae Wook Kim

Proceedings Volume 11820, 118200H (2021) https://doi.org/10.1117/12.2598879

KEYWORDS: Mirrors, Point spread functions, Diffraction, Ultraviolet radiation, Telescopes, Hubble Space Telescope, Surface finishing, Observatories, Ultraviolet telescopes, Monochromatic aberrations

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Proceedings Article | 20 August 2021 Presentation + Paper

Presentation + Paper

The versatile CubeSat Telescope: going to large apertures in small spacecraft

Jaren N. Ashcraft, Ewan Douglas, Daewook Kim, George Smith, Kerri Cahoy, Tom Connors, Kevin Derby, Victor Gasho, Kerry Gonzales, Charlotte Guthery, Geon Hee Kim, Corwynn Sauve, Paul Serra

Proceedings Volume 11819, 1181904 (2021) https://doi.org/10.1117/12.2594884

KEYWORDS: Mirrors, Telescopes, Finite element methods, Aluminum, Optical components, Space operations, Polarization, Off axis mirrors, Stars

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Proceedings Article | 20 August 2021 Presentation + Paper

Presentation + Paper

Updated simulation tools for Roman coronagraph PSFs

Kian Milani, Ewan Douglas, Jaren Ashcraft

Proceedings Volume 11819, 118190E (2021) https://doi.org/10.1117/12.2594807

KEYWORDS: Point spread functions, Wavefronts, Wave propagation, Coronagraphy, Data modeling, Polarization, Actuators, Systems modeling, Atmospheric propagation, Mirrors

Read Abstract +

Proceedings Article | 11 June 2021 Open Access

Open Access

Presentation + Paper

Optical front-end for a quantum key distribution cubesat

Paul Serra, Ondrej Čierny, William Kammerer, Ewan Douglas, Dae Wook Kim, Jaren N. Ashcraft, George Smith, Charlotte Guthery, Tom Vergoossen, Alexander Lohrmann, Robert Bedington, Chithrabhanu Perumangatt, Alexander Ling, Kerri Cahoy

Proceedings Volume 11852, 118523C (2021) https://doi.org/10.1117/12.2599542

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Proceedings Article | 16 December 2020 Poster + Paper

Poster + Paper

A review of simulation and performance modeling tools for the Roman coronagraph instrument

Ewan Douglas, Jaren Ashcraft, Ruslan Belikov, John Debes, Jeremy Kasdin, John Krist, Brianna Lacy, Bijan Nemati, Kian Milani, Leonid Pogorelyuk, A.J. Eldorado Riggs, Dmitry Savransky, Dan Sirbu

Proceedings Volume 11443, 1144338 (2020) https://doi.org/10.1117/12.2561960

KEYWORDS: Device simulation, Coronagraphy, Performance modeling, Exoplanets, Aerospace engineering, Diffraction, Instrument modeling, Speckle, Signal to noise ratio

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Proceedings Article | 13 December 2020 Open Access

Open Access

Presentation + Paper

Design of the vacuum high contrast imaging testbed for CDEEP, the Coronagraphic Debris and Exoplanet Exploring Pioneer

Erin Maier, Ewan Douglas, Dae Wook Kim, Kate Su, Jaren Ashcraft, James Breckinridge, Heejoo Choi, Elodie Choquet, Thomas Connors, Olivier Durney, Kerry Gonzales, Charlotte Guthery, Christian Haughwout, James Heath, Justin Hyatt, Jennifer Lumbres, Jared Males, Elisabeth Matthews, Kian Milani, Oscar Montoya, Mamadou N'Diaye, Jamison Noenickx, Leonid Pogorelyuk, Garreth Ruane, Glenn Schneider, George Smith, Christopher Stark

Proceedings Volume 11443, 114431Y (2020) https://doi.org/10.1117/12.2560878

KEYWORDS: Coronagraphy, Exoplanets, Deformable mirrors, Microelectromechanical systems, Prototyping, Light scattering, Visible radiation, Wavefronts, Rockets, Telescopes

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

An open-source Gaussian beamlet decomposition tool for modeling astronomical telescopes

Jaren Ashcraft, Ewan Douglas

Proceedings Volume 11450, 114501D (2020) https://doi.org/10.1117/12.2561921

KEYWORDS: Telescopes, Image segmentation, Wave propagation, Systems modeling, Coronagraphy, Exoplanets, Device simulation, Wavefronts, Matrices

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Proceedings Article | 5 November 2020 Open Access

Open Access

Paper

Topological pupil segmentation and point spread function analysis for large aperture imaging systems

Yi-Ting Feng, Jaren Nicholas Ashcraft, James Breckinridge, James Harvey, Ewan Douglas, Heejoo Choi, Charles Lillie, Tony Hull, Dae Wook Kim

Proceedings Volume 11568, 115680I (2020) https://doi.org/10.1117/12.2575809

KEYWORDS: Telescopes, James Webb Space Telescope, Point spread functions, Exoplanets, Mirrors, Stars, Diffraction, Imaging systems, Image segmentation, Optical instrument design

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Comparing optical design complexity of high zoom ratio lenses within the VIS, SWIR, and LWIR

Jake Rosvold, Luis Alemán Castañeda, Jaren Ashcraft, Dylan Beckman, Maximillian Bruggeman, Pellegrino Conte, Shenghan Gao, Qi Jin, Nicholas Kochan, Zilong Li, Yuxuan Liu, Matthew Page, John Piotrowski, Jordan Rabinowitz, Colleen Stone, Julie Bentley

Proceedings Volume 11106, 111060B (2019) https://doi.org/10.1117/12.2528875

KEYWORDS: Zoom lenses, Short wave infrared radiation, Long wavelength infrared, Optical design, Lenses, Tolerancing, Chemical elements, Modulation transfer functions, Aspheric lenses, Lens design

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Showing 5 of 31 publications

Conference Committee Involvement (1)

Optical Design Automation

3 August 2025 | San Diego, California, United States

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