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

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''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 ... continued below

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Evans, J W; Morzinski, K; Reza, L; Severson, S; Poyneer, L; Macintosh, B et al. August 16, 2005.

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''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.

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PDF-file: 10 pages; size: 0.3 Mbytes

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  • Presented at: SPIE Optics and Photonics, San Diego, CA, United States, Jul 31 - Aug 04, 2005

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  • Report No.: UCRL-PROC-214650
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 878622
  • Archival Resource Key: ark:/67531/metadc880665

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 16, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 11:29 a.m.

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Evans, J W; Morzinski, K; Reza, L; Severson, S; Poyneer, L; Macintosh, B et al. Extreme Adaptive Optics Testbed: High Contrast Measurements with a MEMS Deformable Mirror, article, August 16, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880665/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.