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Title: Amplitude variations on the Extreme Adaptive Optics testbed

Abstract

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. At the Laboratory for Adaptive Optics on the Extreme Adaptive Optics testbed, we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies. Corresponding contrast measurements, however, are limited by amplitude variations, including those introduced by the micro-electrical-mechanical-systems (MEMS) deformable mirror. Results from experimental measurements and wave optic simulations of amplitude variations on the ExAO testbed are presented. We find systematic intensity variations of about 2% rms, and intensity variations with the MEMS to be 6%. Some errors are introduced by phase and amplitude mixing because the MEMS is not conjugate to the pupil, but independent measurements of MEMS reflectivity suggest that some error is introduced by small non-uniformities in the reflectivity.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
924601
Report Number(s):
UCRL-PROC-233897
TRN: US200809%%386
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: SPIE Optics and Photonics, San Diego, CA, United States, Aug 26 - Aug 30, 2007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; AMPLITUDES; DIFFRACTION; OPTICS; PLANETS; REFLECTIVITY

Citation Formats

Evans, J, Thomas, S, Dillon, D, Gavel, D, Phillion, D, and Macintosh, B. Amplitude variations on the Extreme Adaptive Optics testbed. United States: N. p., 2007. Web.
Evans, J, Thomas, S, Dillon, D, Gavel, D, Phillion, D, & Macintosh, B. Amplitude variations on the Extreme Adaptive Optics testbed. United States.
Evans, J, Thomas, S, Dillon, D, Gavel, D, Phillion, D, and Macintosh, B. 2007. "Amplitude variations on the Extreme Adaptive Optics testbed". United States. https://www.osti.gov/servlets/purl/924601.
@article{osti_924601,
title = {Amplitude variations on the Extreme Adaptive Optics testbed},
author = {Evans, J and Thomas, S and Dillon, D and Gavel, D and Phillion, D and Macintosh, B},
abstractNote = {High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. At the Laboratory for Adaptive Optics on the Extreme Adaptive Optics testbed, we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies. Corresponding contrast measurements, however, are limited by amplitude variations, including those introduced by the micro-electrical-mechanical-systems (MEMS) deformable mirror. Results from experimental measurements and wave optic simulations of amplitude variations on the ExAO testbed are presented. We find systematic intensity variations of about 2% rms, and intensity variations with the MEMS to be 6%. Some errors are introduced by phase and amplitude mixing because the MEMS is not conjugate to the pupil, but independent measurements of MEMS reflectivity suggest that some error is introduced by small non-uniformities in the reflectivity.},
doi = {},
url = {https://www.osti.gov/biblio/924601}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 14 00:00:00 EDT 2007},
month = {Tue Aug 14 00:00:00 EDT 2007}
}

Conference:
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