Broadband focal plane wavefront control of amplitude and phase aberrations

Tyler D. Groff, N. Jeremy Kasdin, Alexis Carlotti, A. J. Eldorado Riggs

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

8 Scopus citations

Abstract

The Stroke Minimization algorithm developed at the Princeton High Contrast Imaging Laboratory has proven symmetric dark hole generation using minimal stroke on two deformable mirrors (DM) in series. The windowed approach to Stroke Minimization has proven symmetric dark holes over small bandwidths by using three wavelengths to define the bandwidth of correction in the optimization problem. We address the relationship of amplitude and phase aberrations with wavelength, how this changes with multiple DMs, and the implications for simultaneously correcting both to achieve symmetric dark holes. Operating Stroke Minimization in the windowed configuration requires multiple wavelength estimates. To save on exposures, a single estimate is extrapolated to bounding wavelengths using the established relationship in wavelength to produce multiple estimates of the image plane electric field. Here we demonstrate better performance by improving this extrapolation of the estimate to other wavelengths. The accuracy of the functional relationship will ultimately bound the achievable bandwidth, therefore as a metric these results are also compared to estimating each wavelength separately. In addition to these algorithm improvements, we also discuss a laboratory upgrade and how it can better simulate broadband starlight. We also discuss the possibility of leveraging two DMs in series to directly estimate the electric field over a narrow bandwidth and the challenges associated with it.

Original languageEnglish (US)
Title of host publicationSpace Telescopes and Instrumentation 2012
Subtitle of host publicationOptical, Infrared, and Millimeter Wave
DOIs
StatePublished - Dec 1 2012
EventSpace Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave - Amsterdam, Netherlands
Duration: Jul 1 2012Jul 6 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8442
ISSN (Print)0277-786X

Other

OtherSpace Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
CountryNetherlands
CityAmsterdam
Period7/1/127/6/12

All Science Journal Classification (ASJC) codes

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

Keywords

  • Adaptive optics
  • Broadband
  • Coronagraphy
  • Deformable mirrors
  • Exoplanets
  • Two-DM
  • Wavefront control
  • Wavefront estimation

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  • Cite this

    Groff, T. D., Jeremy Kasdin, N., Carlotti, A., & Eldorado Riggs, A. J. (2012). Broadband focal plane wavefront control of amplitude and phase aberrations. In Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave [84420C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8442). https://doi.org/10.1117/12.927156