Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm: Speckle control performances

Célia Blain, Olivier Guyon, Frantz Martinache, Colin Bradley, Christophe Clergeon

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

Abstract

Micro-Electro-Mechanical Systems (MEMS) deformable mirrors (DMs) are widely utilized in astronomical Adaptive Optics (AO) instrumentation. High precision open-loop control of MEMS DMs has been achieved by developing a high accuracy DM model, the Fast Iterative Algorithm (FIA), a physics-based model allowing precise control of the DM shape. Accurate open-loop control is particularly critical for the wavefront control of High-Contrast Imaging (HCI) instruments to create a dark hole area free of most slow and quasi-static speckles which remain the limiting factor for direct detection and imaging of exoplanets. The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is one of these high contrast imaging instruments and uses a 1024-actuator MEMS deformable mirror (DM) both in closed-loop and open-loop. The DM is used to modulate speckles in order to distinguish (i) speckles due to static and slow-varying residual aberrations from (ii) speckles due to genuine structures, such as exoplanets. The FIA has been fully integrated into the SCExAO wavefront control software and we report the FIA's performance for the control of speckles in the focal plane.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume8447
DOIs
StatePublished - 2012
Externally publishedYes
EventAdaptive Optics Systems III - Amsterdam, Netherlands
Duration: Jul 1 2012Jul 6 2012

Other

OtherAdaptive Optics Systems III
CountryNetherlands
CityAmsterdam
Period7/1/127/6/12

Fingerprint

Open-loop Control
Deformable Mirror
deformable mirrors
Speckle
Micro-electro-mechanical Systems
Iterative Algorithm
Fast Algorithm
Mirrors
Adaptive optics
Extreme Adaptive Optics
adaptive optics
High Contrast Imaging
Exoplanets
extrasolar planets
Wavefronts
Imaging techniques
Wave Front
Control Software
Adaptive Optics
Focal Plane

Keywords

  • Adaptive optics
  • Deformable mirrors
  • Focal plane speckle control
  • High-contrast imaging
  • Open-loop control

ASJC Scopus subject areas

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

Cite this

Blain, C., Guyon, O., Martinache, F., Bradley, C., & Clergeon, C. (2012). Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm: Speckle control performances. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8447). [844768] https://doi.org/10.1117/12.926401

Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm : Speckle control performances. / Blain, Célia; Guyon, Olivier; Martinache, Frantz; Bradley, Colin; Clergeon, Christophe.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8447 2012. 844768.

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

Blain, C, Guyon, O, Martinache, F, Bradley, C & Clergeon, C 2012, Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm: Speckle control performances. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 8447, 844768, Adaptive Optics Systems III, Amsterdam, Netherlands, 7/1/12. https://doi.org/10.1117/12.926401
Blain C, Guyon O, Martinache F, Bradley C, Clergeon C. Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm: Speckle control performances. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8447. 2012. 844768 https://doi.org/10.1117/12.926401
Blain, Célia ; Guyon, Olivier ; Martinache, Frantz ; Bradley, Colin ; Clergeon, Christophe. / Open-loop control of SCExAO's MEMS deformable mirror using the Fast Iterative Algorithm : Speckle control performances. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8447 2012.
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