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

doi:10.1117/12.2676880

5 October 2023 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

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126802A (2023) https://doi.org/10.1117/12.2676880
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

Accurate high-contrast imaging is achieved using Deformable Mirrors (DM) with actuator precision of 10s pi-cometers. Beyond the demanding wavefront control requirements needed to achieve a contrast ratio of 10⁻¹⁰, 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.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Daniel Quispe, Melville P. Ulmer, Donald B. Buchholz, Yip-Wah Chung, and Jian Cao "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", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126802A (5 October 2023); https://doi.org/10.1117/12.2676880

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