Advances in the control of Si substrates with magnetic smart materials to provide low-power surface control on the sub-nanometer level for space deformable mirrors

Daniel Quispe, Melville P. Ulmer*, Donald B. Buchholz, Yip Wah Chung, Jian Cao

*Corresponding author for this work

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

Abstract

Accurate high-contrast imaging is achieved using deformable mirrors (DM) with actuator precision of 10s picometers. Beyond the demanding wavefront control requirements needed to achieve a contrast ratio of 1010, there is an additional science driver for achieving this ratio over an outer working angle (OWA) large enough to image an exoplanet in a 1 AU orbit around a star 10 parsec or 0.1′′ maximum separation from its host star. Using the formula OWA = Naλ/2D dictates that as D increases, the primary mirror diameter, so does the total number of actuator elements (Na2). Then, the demands of cabling, power, and mass also increase as Na2, which is difficult to achieve for DM-based space missions. Furthermore, fixed-position actuators require high reliability. Our technology has the potential of being able to reduce the number of wires from Na2 to 2Na and with a motion stage can mitigate the dead pixel issue. We report here our work to mature our technology which is based on magnetostriction and magnetization of a magnetic hard overcoat to enable maintaining in-plane stress and set-and-forget DM surface changes when actuators are powered off.

Original languageEnglish (US)
Title of host publicationTechniques and Instrumentation for Detection of Exoplanets XI
EditorsGarreth J. Ruane
PublisherSPIE
ISBN (Electronic)9781510665743
DOIs
StatePublished - 2023
EventTechniques and Instrumentation for Detection of Exoplanets XI 2023 - San Diego, United States
Duration: Aug 21 2023Aug 24 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12680
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceTechniques and Instrumentation for Detection of Exoplanets XI 2023
Country/TerritoryUnited States
CitySan Diego
Period8/21/238/24/23

Keywords

  • Active X-ray optics
  • Terfenol-D
  • deformable mirrors
  • magnetostriction

ASJC Scopus subject areas

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

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