Comparison of wavefront control algorithms and first results on the high-contrast imager for complex aperture telescopes (hicat) testbed

Leboulleux, Lucie; N’Diaye, Mamadou; Mazoyer, J.; Pueyo, Laurent; Perrin, Marshall D.; Egron, Sylvain; Choquet, Élodie; Sauvage, Jean-François; Fusco, Thierry; Soummer, Rémi

doi:10.1117/12.2296154

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…In this context, the HiCAT testbed (High contrast imager for Complex Aperture Telescopes, [1][2][3][4][5][6][7] ) is a dedicated coronagraphic demonstration with on-axis segmented apertures. The project is targeting system-level experiments in ambient conditions that can happen before demonstrations in vacuum.…”

Section: Introductionmentioning

confidence: 99%

High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed loop low-order wavefront sensing and control

Soummer

Por

Pourcelot

et al. 2022

Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed loop low-order wavefront sensing and control

Soummer

Por

Pourcelot

et al. 2022

Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave

View full text Add to dashboard Cite

show abstract

“…The High contrast imaging for Complex Aperture Telescopes (HiCAT) aims to reach several technological advances in the area of coronagraphic design, wavefront control and the overall system integration for a simulated on-axis segmented space telescope. [1][2][3][4][5] One of the primary goals of HiCAT is to test an Apodized Pupil Lyot Coronagraph (APLC) solution for on-axis segmented telescope architectures. 6 This partially obscured aperture scatters light in a complex, though predictable way, which is mitigated by the APLC optimization.…”

Section: Introductionmentioning

confidence: 99%

High-contrast Imager for Complex Aperture Telescopes (HiCAT): 6. Software Control Infrastructure and Calibration

Moriarty,

Brooks,

Soummer

et al. 2019

Preprint

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High contrast imaging using coronagraphy is one of the main avenues to enable the search for life on extrasolar Earth analogs. The HiCAT testbed aims to demonstrate coronagraphy and wavefront control for segmented on-axis space telescopes as envisioned for a future large UV optical IR mission (LUVOIR). Our software infrastructure enables 24/7 automated operation of high-contrast imaging experiments while monitoring for safe operating parameters, along with graceful shutdown processes for unsafe conditions or unexpected errors. The infrastructure also includes a calibration suite that can run nightly to catch regressions and track optical performance changes over time, and a testbed simulator to support software development and testing, as well as optical modeling necessary for high-contrast algorithms. This paper presents a design and implementation of testbed control software to leverage continuous integration whether the testbed is available or not.

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“…A complex trade space exists between the performance of individual subsystems, for instance trading between passive stability and active control, or between coronagraph throughput, inner working angle, and sensitivity to misalignments. 13 Addressing these challenges is the central theme of the HiCAT testbed (High contrast imager for Complex Aperture Telescopes [14][15][16][17][18] ). Starting in 2013, HiCAT has led the way in developing coronagraph and wavefront control solutions for segmented apertures.…”

Section: Introductionmentioning

confidence: 99%

High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control

Soummer,

Brady,

Brooks

et al. 2019

Preprint

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Segmented telescopes are a possible approach to enable large-aperture space telescopes for the direct imaging and spectroscopy of habitable worlds. However, the increased complexity of their aperture geometry, due to the central obstruction, support structures and segment gaps, makes high-contrast imaging very challenging. The High-contrast Imager for Complex Aperture Telescopes (HiCAT) testbed was designed to study and develop solutions for such telescope pupils using wavefront control and coronagraphic starlight suppression. The testbed design has the flexibility to enable studies with increasing complexity for telescope aperture geometries starting with off-axis telescopes, then on-axis telescopes with central obstruction and support structures -e.g. the Wide Field Infrared Survey Telescope (WFIRST) -up to on-axis segmented telescopes, including various concepts for a Large UV, Optical, IR telescope (LUVOIR). In the past year, HiCAT has made significant hardware and software updates in order to accelerate the development of the project. In addition to completely overhauling the software that runs the testbed, we have completed several hardware upgrades, including the second and third deformable mirror, and the first custom Apodized Pupil Lyot Coronagraph (APLC) optimized for the HiCAT aperture, which is similar to one of the possible geometries considered for LUVOIR. The testbed also includes several external metrology features for rapid replacement of parts, and in particular the ability to test multiple apodizers readily, an active tip-tilt control system to compensate for local vibration and air turbulence in the enclosure. On the software and operations side, the software infrastructure enables 24/7 automated experiments that include routine calibration tasks and high-contrast experiments. In this communication we present an overview and status update of the project, both on the hardware and software side, and describe the results obtained with APLC wavefront control.

show abstract

Comparison of wavefront control algorithms and first results on the high-contrast imager for complex aperture telescopes (hicat) testbed

Cited by 5 publications

References 26 publications

High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed loop low-order wavefront sensing and control

High-contrast imager for complex aperture telescopes (HiCAT): 8. Dark zone demonstration with simultaneous closed loop low-order wavefront sensing and control

High-contrast Imager for Complex Aperture Telescopes (HiCAT): 6. Software Control Infrastructure and Calibration

High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control

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