Demonstration of high contrast in 10% broadband light with the shaped pupil coronagraph

Ruslan Belikov, Amir Give'on, Brian Kern, Eric Cady, Michael Carr, Stuart Shaklan, Kunjithapatham Balasubramanian, Victor White, Pierre Echternach, Matt Dickie, John Trauger, Andreas Kuhnert, N. Jeremy Kasdin

Research output: Contribution to journalConference article

36 Scopus citations

Abstract

The Shaped Pupil Coronagraph (SPC) is a high-contrast imaging system pioneered at Princeton for detection of extrasolar earthlike planets. It is designed to achieve 10-10 contrast at an inner working angle of 4λ/D in broadband light. A critical requirement in attaining this contrast level in practice is the ability to control wavefront phase and amplitude aberrations to at least λ/104 in rms phase and 1/1000 rms amplitude, respectively. Furthermore, this has to be maintained over a large spectral band. The High Contrast Imaging Testbed (HCIT) at the Jet Propulsion Lab (JPL) is a state-of-the-art facility for studying such high contrast imaging systems and wavefront control methods. It consists of a vacuum chamber containing a configurable coronagraph setup with a Xinetics deformable mirror. Previously, we demonstrated 4×10-8 contrast with the SPC at HCIT in 10% broadband light. The limiting factors were subsequently identified as (1) manufacturing defects due to minimal feature size constraints on our shaped pupil masks and (2) the inefficiency of the wavefront correction algorithm we used (classical speckle nulling) to correct for these defects. In this paper, we demonstrate the solutions to both of these problems. In particular, we present a method to design masks with practical minimal feature sizes and show new manufactured masks with few defects. These masks were installed at HCIT and tested using more sophisticated wavefront control algorithms based on energy minimization of light in the dark zone. We present the results of these experiments, notably a record 2.4 × 10-9 contrast in 10% broadband light.

Original languageEnglish (US)
Article number66930Y
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume6693
DOIs
StatePublished - Dec 1 2007
EventTechniques and Instrumentation for Detection of Exoplanets III - San Diego, CA, United States
Duration: Aug 28 2007Aug 30 2007

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
  • Extrasolar planets
  • High contrast
  • Shaped pupils
  • Wavefront correction

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    Belikov, R., Give'on, A., Kern, B., Cady, E., Carr, M., Shaklan, S., Balasubramanian, K., White, V., Echternach, P., Dickie, M., Trauger, J., Kuhnert, A., & Kasdin, N. J. (2007). Demonstration of high contrast in 10% broadband light with the shaped pupil coronagraph. Proceedings of SPIE - The International Society for Optical Engineering, 6693, [66930Y]. https://doi.org/10.1117/12.734976