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Title: Extreme Adaptive Optics Testbed: High Contrast Measurements with a MEMS Deformable Mirror

Abstract

''Extreme'' adaptive optics systems are optimized for ultra-high-contrast applications, such as ground-based extrasolar planet detection. The Extreme Adaptive Optics Testbed at UC Santa Cruz is being used to investigate and develop technologies for high-contrast imaging, especially wavefront control. We use a simple optical design to minimize wavefront error and maximize the experimentally achievable contrast. A phase shifting diffraction interferometer (PSDI) measures wavefront errors with sub-nm precision and accuracy for metrology and wavefront control. Previously, we have demonstrated RMS wavefront errors of <1.5 nm and a contrast of >10{sup 7} over a substantial region using a shaped pupil without a deformable mirror. Current work includes the installation and characterization of a 1024-actuator Micro-Electro-Mechanical-Systems (MEMS) deformable mirror, manufactured by Boston Micro-Machines for active wavefront control. Using the PSDI as the wavefront sensor we have flattened the deformable mirror to <1 nm within the controllable spatial frequencies and measured a contrast in the far field of >10{sup 6}. Consistent flattening required testing and characterization of the individual actuator response, including the effects of dead and low-response actuators. Stability and repeatability of the MEMS devices was also tested. Ultimately this testbed will be used to test all aspects of the system architecture for anmore » extrasolar planet-finding AO system.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
878622
Report Number(s):
UCRL-PROC-214650
Journal ID: ISSN 0277-786X; TRN: US200611%%368
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 5905; Conference: Presented at: SPIE Optics and Photonics, San Diego, CA, United States, Jul 31 - Aug 04, 2005
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; ACCURACY; ACTUATORS; ARCHITECTURE; DESIGN; DETECTION; DIFFRACTION; INTERFEROMETERS; MIRRORS; OPTICS; PLANETS; STABILITY; TESTING

Citation Formats

Evans, J W, Morzinski, K, Reza, L, Severson, S, Poyneer, L, Macintosh, B, Dillon, D, and Sommargren, G. Extreme Adaptive Optics Testbed: High Contrast Measurements with a MEMS Deformable Mirror. United States: N. p., 2005. Web. doi:10.1117/12.619140.
Evans, J W, Morzinski, K, Reza, L, Severson, S, Poyneer, L, Macintosh, B, Dillon, D, & Sommargren, G. Extreme Adaptive Optics Testbed: High Contrast Measurements with a MEMS Deformable Mirror. United States. doi:10.1117/12.619140.
Evans, J W, Morzinski, K, Reza, L, Severson, S, Poyneer, L, Macintosh, B, Dillon, D, and Sommargren, G. Tue . "Extreme Adaptive Optics Testbed: High Contrast Measurements with a MEMS Deformable Mirror". United States. doi:10.1117/12.619140. https://www.osti.gov/servlets/purl/878622.
@article{osti_878622,
title = {Extreme Adaptive Optics Testbed: High Contrast Measurements with a MEMS Deformable Mirror},
author = {Evans, J W and Morzinski, K and Reza, L and Severson, S and Poyneer, L and Macintosh, B and Dillon, D and Sommargren, G},
abstractNote = {''Extreme'' adaptive optics systems are optimized for ultra-high-contrast applications, such as ground-based extrasolar planet detection. The Extreme Adaptive Optics Testbed at UC Santa Cruz is being used to investigate and develop technologies for high-contrast imaging, especially wavefront control. We use a simple optical design to minimize wavefront error and maximize the experimentally achievable contrast. A phase shifting diffraction interferometer (PSDI) measures wavefront errors with sub-nm precision and accuracy for metrology and wavefront control. Previously, we have demonstrated RMS wavefront errors of <1.5 nm and a contrast of >10{sup 7} over a substantial region using a shaped pupil without a deformable mirror. Current work includes the installation and characterization of a 1024-actuator Micro-Electro-Mechanical-Systems (MEMS) deformable mirror, manufactured by Boston Micro-Machines for active wavefront control. Using the PSDI as the wavefront sensor we have flattened the deformable mirror to <1 nm within the controllable spatial frequencies and measured a contrast in the far field of >10{sup 6}. Consistent flattening required testing and characterization of the individual actuator response, including the effects of dead and low-response actuators. Stability and repeatability of the MEMS devices was also tested. Ultimately this testbed will be used to test all aspects of the system architecture for an extrasolar planet-finding AO system.},
doi = {10.1117/12.619140},
journal = {},
issn = {0277-786X},
number = ,
volume = 5905,
place = {United States},
year = {2005},
month = {8}
}

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