Demonstration of a 17 cm robust carbon fiber deformable mirror for adaptive optics

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Carbon-fiber reinforced polymer (CFRP) composite is an attractive material for fabrication of optics due to its high stiffness-to-weight ratio, robustness, zero coefficient of thermal expansion (CTE), and the ability to replicate multiple optics from the same mandrel. We use 8 and 17 cm prototype CFRP thin-shell deformable mirrors to show that residual CTE variation may be addressed with mounted actuators for a variety of mirror sizes. We present measurements of surface quality at a range of temperatures characteristic of mountaintop observatories. For the 8 cm piece, the figure error of the Al-coated reflective surface under best actuator correction is {approx}43 ... continued below

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Ammons, S M; Hart, M; Coughenour, B; Romeo, R; Martin, R & Rademacher, M September 12, 2011.

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Carbon-fiber reinforced polymer (CFRP) composite is an attractive material for fabrication of optics due to its high stiffness-to-weight ratio, robustness, zero coefficient of thermal expansion (CTE), and the ability to replicate multiple optics from the same mandrel. We use 8 and 17 cm prototype CFRP thin-shell deformable mirrors to show that residual CTE variation may be addressed with mounted actuators for a variety of mirror sizes. We present measurements of surface quality at a range of temperatures characteristic of mountaintop observatories. For the 8 cm piece, the figure error of the Al-coated reflective surface under best actuator correction is {approx}43 nm RMS. The 8 cm mirror has a low surface error internal to the outer ring of actuators (17 nm RMS at 20 C and 33 nm RMS at -5 C). Surface roughness is low (< 3 nm P-V) at a variety of temperatures. We present new figure quality measurements of the larger 17 cm mirror, showing that the intra-actuator figure error internal to the outer ring of actuators (38 nm RMS surface with one-third the actuator density of the 8 cm mirror) does not scale sharply with mirror diameter.

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PDF-file: 12 pages; size: 9.1 Mbytes

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  • Presented at: SPIE Optics & Photonics, San Diego, CA, United States, Aug 21 - Aug 25, 2011

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  • Report No.: LLNL-PROC-499224
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1026468
  • Archival Resource Key: ark:/67531/metadc845766

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  • September 12, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 5, 2016, 1:33 p.m.

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Ammons, S M; Hart, M; Coughenour, B; Romeo, R; Martin, R & Rademacher, M. Demonstration of a 17 cm robust carbon fiber deformable mirror for adaptive optics, article, September 12, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc845766/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.