Optical fabrication of the MMT adaptive secondary mirror

H. M. Martin, James H Burge, C. Del Vecchio, L. R. Dettmann, S. M. Miller, B. Smith, F. Wildi

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

20 Citations (Scopus)

Abstract

We describe the optical fabrication of the adaptive secondary mirror for the MMT. The 640 mm f/15 secondary consists of a flexible glass shell, 1.8 mm thick, whose shape is controlled by 336 electromagnetic actuators. It is designed to give diffraction-limited images at a wavelength of 1 micron. For generating and polishing, the shell was supported by attaching it to a rigid glass blocking body with a thin layer of pitch. It could then be figured and measured using techniques developed for rigid secondaries. The highly aspheric surface was polished with a 30 cm stressed lap and small passive tools, and measured using a swing-arm profilometer and a holographic test plate. The goal for fabrication was to produce diffraction-limited images in the visible, after simulated adaptive correction using only a small fraction of the typical actuator forces. This translates into a surface accuracy of less than 19 nm rms with correction forces of less than 0.05 N rms. We achieved a surface accuracy of 8 nm rms after simulated correction with forces of 0.02 N rms.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Volume4007
StatePublished - 2000
EventAdaptive Optical Systems Technology - Munich, Ger
Duration: Mar 29 2000Mar 31 2000

Other

OtherAdaptive Optical Systems Technology
CityMunich, Ger
Period3/29/003/31/00

Fingerprint

Mirrors
mirrors
Fabrication
fabrication
Actuators
Diffraction
actuators
Glass
profilometers
glass
Polishing
polishing
diffraction
electromagnetism
Wavelength
wavelengths

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Martin, H. M., Burge, J. H., Del Vecchio, C., Dettmann, L. R., Miller, S. M., Smith, B., & Wildi, F. (2000). Optical fabrication of the MMT adaptive secondary mirror. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4007). Society of Photo-Optical Instrumentation Engineers.

Optical fabrication of the MMT adaptive secondary mirror. / Martin, H. M.; Burge, James H; Del Vecchio, C.; Dettmann, L. R.; Miller, S. M.; Smith, B.; Wildi, F.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4007 Society of Photo-Optical Instrumentation Engineers, 2000.

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

Martin, HM, Burge, JH, Del Vecchio, C, Dettmann, LR, Miller, SM, Smith, B & Wildi, F 2000, Optical fabrication of the MMT adaptive secondary mirror. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 4007, Society of Photo-Optical Instrumentation Engineers, Adaptive Optical Systems Technology, Munich, Ger, 3/29/00.
Martin HM, Burge JH, Del Vecchio C, Dettmann LR, Miller SM, Smith B et al. Optical fabrication of the MMT adaptive secondary mirror. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4007. Society of Photo-Optical Instrumentation Engineers. 2000
Martin, H. M. ; Burge, James H ; Del Vecchio, C. ; Dettmann, L. R. ; Miller, S. M. ; Smith, B. ; Wildi, F. / Optical fabrication of the MMT adaptive secondary mirror. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4007 Society of Photo-Optical Instrumentation Engineers, 2000.
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