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Proceedings Article

Amplitude variations on the ExAO testbed: Part II

[+] Author Affiliations
Sandrine Thomas, Donald Gavel, Daren Dillon

Univ. of California at Santa Cruz

Julia W. Evans, Donald Phillion

Lawrence Livermore National Lab.

Bruce Macintosh

Univ. of California at Santa Cruz and Lawrence Livermore National Lab.

Proc. SPIE 6888, MEMS Adaptive Optics II, 68880J (February 08, 2008); doi:10.1117/12.771766
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From Conference Volume 6888

  • MEMS Adaptive Optics II
  • Scot S. Olivier; Thomas G. Bifano; Joel A. Kubby
  • San Jose, CA | January 19, 2008

abstract

Micro-electrical-mechanical-systems (MEMS) deformable mirrors (DMs) are under study at the Laboratory for Adaptive Optics for inclusion in possible future adaptive optics systems, including open loop or extreme adaptive optics (ExAO) systems. MEMS DMs have several advantages in these areas because of low (to zero) hysterisis and high actuator counts. In this paper, we present work in the area of high-contrast adaptive optics systems, such as those needed to image extrasolar planets. These are known to require excellent wavefront control and diffraction suppression. On the ExAO testbed we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies, however, corresponding contrast measurements are limited by amplitude variations, including variations introduced by the MEMS. Results from experimental measurements and wave optic simulations on the ExAO testbed will be presented. In particular the effect of small scale MEMS structures on amplitude variations and ultimately high-contrast far field measurements will be examined. Experimental results include interferometer measurements of phase and amplitude using the phase shifting diffraction interferometer, direct imaging of the pupil, and far-field imaging.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Sandrine Thomas ; Julia W. Evans ; Donald Phillion ; Donald Gavel ; Daren Dillon, et al.
"Amplitude variations on the ExAO testbed: Part II", Proc. SPIE 6888, MEMS Adaptive Optics II, 68880J (February 08, 2008); doi:10.1117/12.771766; http://dx.doi.org/10.1117/12.771766


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