Improving the broadband contrast at small inner working angles using image sharpening techniques

Sandrine Thomas, Eugene Pluzhnik, Julien Lozi, Ruslan Belikov, Fred Witteborn, Thomas Greene, Glenn Schneider, Olivier Guyon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The detection of extrasolar planets, using both space- and ground-based telescopes, is one of the most exciting fields in astronomy today. From the ground, the upcoming Extremely Large Telescopes will offer a significant increase in our capability to directly image exoplanets and could potentially lead to the direct detection of planets in the habitable zone. To obtain contrasts better than 10-7-10-9 requires precise wavefront control algorithms. Although wavefront control techniques, such as Electric Field Conjugation, stroke minimization and speckle nulling, have been already developed and will soon be operational on 8-m class telescopes, they primarily function in monochromatic light and at moderate separations (r>3 λ=D). While wavefront control simulations combining polychromatic light and smaller inner working angles (1.2 λ=D for example) have shown promising results, experimental verification is still ongoing. In this paper, we discuss the challenges emerging when pushing the limits of high-contrast imaging and present our latest contrast results using wavefront control techniques optimized for small separations. This work is performed using the NASA Ames Coronagraph Experiment (ACE) laboratory testbed located in California.

Original languageEnglish (US)
Title of host publication3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes
PublisherINAF - Osservatorio Astrofisico di Arcetri Largo Enrico Fermi
ISBN (Print)9788890887604
DOIs
StatePublished - Jan 1 2013
Externally publishedYes
Event3rd Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2013 - Florence, Italy
Duration: May 26 2013May 31 2013

Publication series

Name3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

Other

Other3rd Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2013
CountryItaly
CityFlorence
Period5/26/135/31/13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Thomas, S., Pluzhnik, E., Lozi, J., Belikov, R., Witteborn, F., Greene, T., Schneider, G., & Guyon, O. (2013). Improving the broadband contrast at small inner working angles using image sharpening techniques. In 3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes (3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes). INAF - Osservatorio Astrofisico di Arcetri Largo Enrico Fermi. https://doi.org/10.12839/AO4ELT3.13359