Ms. Manxuan Zhang Profile

Manxuan Zhang

Graduate Student Researcher

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Author

Publications (7)

Proceedings Article | 5 October 2023 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 | 4 August 2021 Presentation

High-contrast imager for complex aperture telescopes (HiCAT): 7. Dark zone demonstration with fully segmented aperture coronagraph

Rémi Soummer, Iva Laginja, Scott Will, Marshall Perrin, James Noss, Emiel Por, Susan Redmond, Raphaël Pourcelot, Ananya Sahoo, Peter Petrone, Keira Brooks, Laurent Pueyo, Bryony Nickson, Matt Maclay, Gregory Brady, Thomas Comeau, Julia Fowler, Kelsey Glazer, Rob Gontrum, John Hagopian, Theo Jolivet, Maggie Kautz, Lucie Leboulleux, Evelyn McChesney, Laurent Mugnier, Mamadou N'Diaye, Meiji Nguyen, Heather Olszewski, Leonid Pogorelyuk, Jaret Prothro, Jean-François Sauvage, Nathan Scott, Ron Shiri, Anand Sivaramakrishnan, Hari Subedi, Sam Weinstock, Yinzi Xin, Rebecca Zhang

Proceedings Volume 11823, 118230T (2021) https://doi.org/10.1117/12.2594684

KEYWORDS: Image segmentation, Coronagraphy, Telescopes, Imaging systems, Wavefront sensors, Wavefronts, Deformable mirrors, Ultraviolet telescopes, Ultraviolet radiation, UV optics

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Proceedings Article | 10 September 2019 Presentation + Paper

Novel implementation of a Kalman filter for speckle nulling with a fiber injection unit

Manxuan Zhang, Jorge Llop Sayson, Nemanja Jovanovic, Dimitri Mawet, Yeyuan Xin

Proceedings Volume 11117, 111171X (2019) https://doi.org/10.1117/12.2530756

KEYWORDS: Speckle, Filtering (signal processing), Exoplanets, Stars, Nulling interferometry, Coronagraphy, Spectral resolution, Imaging spectroscopy, Spectroscopy, Adaptive optics

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Proceedings Article | 9 September 2019 Presentation + Paper

Phase-retrieval-based wavefront metrology for high-contrast coronography: 2. Reconstructions through a shaped pupil apodizer

Gregory Brady, Peter Petrone, Iva Laginja, Keira Brooks, Manxuan (Rebecca) Zhang, Mamadou N'Diaye, Christopher Moriarty, John Hagopian, Rémi Soummer

Proceedings Volume 11117, 1111712 (2019) https://doi.org/10.1117/12.2530482

KEYWORDS: Wavefronts, Wavefront metrology, Phase retrieval, Coronagraphy, Manufacturing, Exoplanets, Binary data, Imaging systems, Phase measurement, Deformable mirrors

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Proceedings Article | 12 July 2018 Paper

Characterization of microdot apodizers for imaging exoplanets with next-generation space telescopes

Manxuan Zhang, Garreth Ruane, Jacques-Robert Delorme, Dimitri Mawet, Nemanja Jovanovic, Jeffrey Jewell, Stuart Shaklan, J. Kent Wallace

Proceedings Volume 10698, 106985X (2018) https://doi.org/10.1117/12.2312831

KEYWORDS: Exoplanets, Coronagraphy, Image segmentation, Space telescopes, Phase measurement, Wavefronts, Telescopes, Planets, Apodization

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A major science goal of future, large-aperture, optical space telescopes is to directly image and spectroscopically analyze reflected light from potentially habitable exoplanets. To accomplish this, the optical system must suppress diffracted light from the star to reveal point sources approximately ten orders of magnitude fainter than the host star at small angular separation. Coronagraphs with microdot apodizers achieve the theoretical performance needed to image Earth-like planets with a range of possible telescope designs, including those with obscured and segmented pupils. A test microdot apodizer with various bulk patterns (step functions, gradients, and sinusoids) and 4 different dot sizes (3 μm, 5 μm, 7 μm, and 10 μm) made of small chrome squares on anti-reflective glass was characterized with microscopy, optical laser interferometry, as well as transmission and reflectance measurements at wavelengths λ=600 nm and λ=800 nm. Microscopy revealed the microdots were fabricated to high precision. Results from laser interferometry showed that the phase shifts observed in reflection vary with the local microdot fill factor. This effect is not explained purely by interference between reflected fields from the chrome and glass portions. Transmission measurements showed that microdot fill factor and transmission were linearly related for dot sizes ≥5 μm. However, anomalously high transmittance was measured when the dot size is <5× the wavelength (i.e. ∼3 μm) and the fill factor is approximately 50%, where the microdot pattern becomes periodic. The transmission excess is not as prominent in the case of larger dot sizes suggesting that it is likely to be caused by the interaction between the incident field and electronic resonances in the surface of the metallic microdots. We used our empirical models of the microdot apodizers to optimize a second generation of reflective apodizer designs, specifically for demonstrating end-to-end instrumentation for planet characterization at Caltech’s High Contrast Spectroscopy Testbed for Segmented Telescopes (HCST), and confirmed that the amplitude and phase of the reflected beam closely matches the ideal wavefront.

Proceedings Article | 10 July 2018 Presentation

Laboratory testing of coronagraphs for future space telescopes on the Caltech high contrast spectroscopy testbed for segmented telescopes (HCST) (Conference Presentation)

Garreth Ruane, Dimitri Mawet, Jacques-Robert Delorme, Nemanja Jovanovic, Daniel Echeverri, Jorge Llop Sayson, Manxuan (Rebecca) Zhang, A. J. Eldorado Riggs, Stuart Shaklan, Eugene Serabyn, James Wallace

Proceedings Volume 10698, 106981F (2018) https://doi.org/10.1117/12.2312851

KEYWORDS: Space telescopes, Coronagraphy, Telescopes, Spectroscopy, Image segmentation, Stars, Spectroscopes, Mirrors, Exoplanets, Mirror structures

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Proceedings Article | 22 January 2018 Presentation + Paper

High-contrast spectroscopy testbed for segmented telescopes

J. R. Delorme, D. Mawet, J. Fucik, J. Wallace, G. Ruane, N. Jovanovic, N. Klimovich, J. D. Llop Sayson, R. Zhang, Y. Xin, R. Riddle, R. Dekany, J. Wang, E. Choquet, W. Xuan, D. Echeverri, M. Randolph, G. Vasisht, B. Mennesson

Proceedings Volume 10400, 104000X (2018) https://doi.org/10.1117/12.2274893

KEYWORDS: Space telescopes, Telescopes, Device simulation, Image segmentation, Coronagraphy, Planets, Adaptive optics, Mirrors, Deformable mirrors, Wavefront sensors

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Showing 5 of 7 publications

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