Sparse aperture mask wavefront sensor testbed results

Hari Subedi, Neil T. Zimmerman, N. Jeremy Kasdin, A. J.E. Riggs

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

Abstract

Coronagraphic exoplanet detection at very high contrast requires the estimation and control of low-order wave- front aberrations. At Princeton High Contrast Imaging Lab (PHCIL), we are working on a new technique that integrates a sparse-aperture mask (SAM) with a shaped pupil coronagraph (SPC) to make precise estimates of these low-order aberrations. We collect the starlight rejected from the coronagraphic image plane and interfere it using a sparse aperture mask (SAM) at the relay pupil to estimate the low-order aberrations. In our previous work we numerically demonstrated the efficacy of the technique, and proposed a method to sense and control these differential aberrations in broadband light. We also presented early testbed results in which the SAM was used to sense pointing errors. In this paper, we will briefly overview the SAM wavefront sensor technique, explain the design of the completed testbed, and report the experimental estimation results of the dominant low-order aberrations such as tip/tit, astigmatism and focus.

Original languageEnglish (US)
Title of host publicationSpace Telescopes and Instrumentation 2016
Subtitle of host publicationOptical, Infrared, and Millimeter Wave
EditorsHoward A. MacEwen, Makenzie Lystrup, Giovanni G. Fazio
PublisherSPIE
ISBN (Electronic)9781510601871
DOIs
StatePublished - Jan 1 2016
EventSpace Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave - Edinburgh, United Kingdom
Duration: Jun 26 2016Jul 1 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9904
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherSpace Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
CountryUnited Kingdom
CityEdinburgh
Period6/26/167/1/16

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Coronagraph
  • Exoplanet
  • High-contrast imaging
  • Wavefront control
  • Wavefront sensing

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  • Cite this

    Subedi, H., Zimmerman, N. T., Kasdin, N. J., & Riggs, A. J. E. (2016). Sparse aperture mask wavefront sensor testbed results. In H. A. MacEwen, M. Lystrup, & G. G. Fazio (Eds.), Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave [990464] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9904). SPIE. https://doi.org/10.1117/12.2232015