Mr. Kian Milani Profile

Kian Milani

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Publications (15)

SPIE Journal Paper | 15 May 2024 Open Access

Modeling and performance analysis of implicit electric field conjugation with two deformable mirrors applied to the Roman Coronagraph

Kian Milani, Ewan Douglas, Sebastiaan Haffert, Kyle Van Gorkom

JATIS, Vol. 10, Issue 02, 029001, (May 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.2.029001

KEYWORDS: Calibration, Electric fields, Simulations, Coronagraphy, Actuators, Modeling, Stars, Wavefronts, Equipment, Matrices

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High-order wavefront sensing and control (HOWFSC) is key to creating a dark hole region within the coronagraphic image plane where high contrasts are achieved. The Roman Coronagraph is expected to perform its HOWFSC with a ground-in-the-loop scheme due to the computational complexity of the electric field conjugation (EFC) algorithm. This scheme provides the flexibility to alter the HOWFSC algorithm for given science objectives. The baseline HOWFSC scheme involves running EFC while observing a bright star such as ζ Puppis to create the initial dark hole followed by a slew to the science target. The new implicit EFC (iEFC) algorithm removes the optical diffraction model from the controller, making the final contrast independent of model accuracy. While previously demonstrated with a single deformable mirror, iEFC is extended to two deformable mirror systems to create annular dark holes. First, an overview of both EFC and iEFC is presented. The algorithm is then applied to the wide-field-of-view shaped pupil coronagraph (SPC-WFOV) mode designed for the Roman Space Telescope using end-to-end physical optics models. Initial noiseless monochromatic simulations demonstrate the efficacy of iEFC as well as the optimal choice of modes for the SPC-WFOV instrument. Further simulations with a 3.6% wavefront control bandpass and a broader 10% bandpass then demonstrate that iEFC can be used in broadband scenarios to achieve contrasts below 10−8 with Roman. Finally, an electron multiplying charge-coupled device (EMCCD) model is implemented to estimate calibration times and predict the controller’s performance. Here, 10−8 contrasts are achieved with a calibration time of ∼6.8 h assuming the reference star is ζ Puppis. The results here indicate that iEFC can be a valid HOWFSC method that can mitigate the risk of model errors associated with space-borne coronagraphs, but to maximize iEFC performance, lengthy calibration times will be required to mitigate the noise accumulated during calibration.

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Proceedings Article | 5 October 2023 Presentation + Paper

Evaluating embedded hardware for high-order wavefront sensing and control

Nicholas Belsten, Kian Milani, Leonid Pogorelyuk, Brandon Eickert, Shanti Rao, Ewan Douglas, Kerri Cahoy

Proceedings Volume 12680, 126801N (2023) https://doi.org/10.1117/12.2677816

KEYWORDS: Matrices, Telescopes, Design and modelling, Evolutionary algorithms, Field programmable gate arrays, Coronagraphy, Computing systems, Exoplanets, Space telescopes, Image processing

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Proceedings Article | 5 October 2023 Presentation + Paper

Simulating the efficacy of the implicit-electric-field-conjugation algorithm for the Roman Coronagraph with noise

Kian Milani, Ewan Douglas, Sebastiaan Haffert, Kyle Van Gorkom

Proceedings Volume 12680, 126800Z (2023) https://doi.org/10.1117/12.2677803

KEYWORDS: Calibration, Simulations, Coronagraphy, Actuators, Stars, Wavefronts, Telescopes

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Proceedings Article | 5 October 2023 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 | 4 October 2023 Presentation + Paper

Integrated modeling of wavefront sensing and control for space telescopes utilizing active and adaptive optics

Kevin Derby, Kian Milani, Solvay Blomquist, Kyle Van Gorkom, Sebastiaan Haffert, Hyukmo Kang, Hill Tailor, Heejoo Choi, Christopher Mendillo, Jared Males, Daewook Kim, Ewan Douglas

Proceedings Volume 12677, 126770I (2023) https://doi.org/10.1117/12.2677663

KEYWORDS: Telescopes, Wavefronts, Wavefront errors, Wavefront sensors, Point spread functions, Coronagraphy, Signal to noise ratio, Error analysis, Integrated modeling, Wavefront compensation

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Proceedings Article | 28 September 2023 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 | 27 August 2022 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

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Proceedings Article | 27 August 2022 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 | 27 August 2022 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

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Proceedings Article | 27 August 2022 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

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Proceedings Article | 20 August 2021 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

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Proceedings Article | 16 December 2020 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

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 | 20 August 2020 Presentation + Paper

Faster imaging simulation through complex systems: a coronagraphic example

Kian Milani, Ewan Douglas

Proceedings Volume 11484, 1148405 (2020) https://doi.org/10.1117/12.2568204

KEYWORDS: Point spread functions, Coronagraphy, Computer simulations, Scene simulation, Convolution, Image processing, Wavefronts, Imaging systems, Exoplanets

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Proceedings Article | 9 September 2019 Paper

Simulating the effects of exozodiacal dust in WFIRST CGI observations

Ewan Douglas, John Debes, Kian Milani, Yinzi Xin, Kerri Cahoy, Nikole Lewis, Bruce Macintosh

Proceedings Volume 11117, 111170K (2019) https://doi.org/10.1117/12.2529488

KEYWORDS: Infrared telescopes, Stars, Light scattering, Space operations, Exoplanets, Infrared imaging, Infrared radiation, Telescopes, Coronagraphy, Color imaging

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Showing 5 of 15 publications

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