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

S. Mark Ammons, Michael Hart, Blake Coughenour, Robert Romeo, Robert Martin, Matt Rademacher

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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 ∼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.

Original languageEnglish (US)
Title of host publicationAstronomical Adaptive Optics Systems and Applications IV
DOIs
StatePublished - Oct 21 2011
EventAstronomical Adaptive Optics Systems and Applications IV - San Diego, CA, United States
Duration: Aug 21 2011Aug 24 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8149
ISSN (Print)0277-786X

Other

OtherAstronomical Adaptive Optics Systems and Applications IV
CountryUnited States
CitySan Diego, CA
Period8/21/118/24/11

Fingerprint

Deformable Mirror
Carbon Fiber
Adaptive optics
deformable mirrors
Adaptive Optics
carbon fibers
adaptive optics
Carbon fibers
Actuator
Mirrors
Demonstrations
Actuators
actuators
Mirror
mirrors
Coefficient of Thermal Expansion
Figure
Thermal expansion
Optics
thermal expansion

Keywords

  • adaptive optics
  • adaptive secondary
  • carbon fiber
  • carbon fiber reinforced polymer
  • CFRP
  • composite
  • deformable
  • thin-shell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Ammons, S. M., Hart, M., Coughenour, B., Romeo, R., Martin, R., & Rademacher, M. (2011). Demonstration of 17 cm robust carbon fiber deformable mirror for adaptive optics. In Astronomical Adaptive Optics Systems and Applications IV [81490C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8149). https://doi.org/10.1117/12.894186

Demonstration of 17 cm robust carbon fiber deformable mirror for adaptive optics. / Ammons, S. Mark; Hart, Michael; Coughenour, Blake; Romeo, Robert; Martin, Robert; Rademacher, Matt.

Astronomical Adaptive Optics Systems and Applications IV. 2011. 81490C (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8149).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ammons, SM, Hart, M, Coughenour, B, Romeo, R, Martin, R & Rademacher, M 2011, Demonstration of 17 cm robust carbon fiber deformable mirror for adaptive optics. in Astronomical Adaptive Optics Systems and Applications IV., 81490C, Proceedings of SPIE - The International Society for Optical Engineering, vol. 8149, Astronomical Adaptive Optics Systems and Applications IV, San Diego, CA, United States, 8/21/11. https://doi.org/10.1117/12.894186
Ammons SM, Hart M, Coughenour B, Romeo R, Martin R, Rademacher M. Demonstration of 17 cm robust carbon fiber deformable mirror for adaptive optics. In Astronomical Adaptive Optics Systems and Applications IV. 2011. 81490C. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.894186
Ammons, S. Mark ; Hart, Michael ; Coughenour, Blake ; Romeo, Robert ; Martin, Robert ; Rademacher, Matt. / Demonstration of 17 cm robust carbon fiber deformable mirror for adaptive optics. Astronomical Adaptive Optics Systems and Applications IV. 2011. (Proceedings of SPIE - The International Society for Optical Engineering).
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