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Proceedings Article

Optical phasing of a segmented mirror with sub-nanometer precision: experimental results of the APE Internal Metrology

[+] Author Affiliations
Rainer Wilhelm, Bruno Luong, Alain Courteville, Sébastien Estival

FOGALE nanotech (France)

Frédéric Gonté

European Southern Observatory (Germany)

Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701212 (August 27, 2008); doi:10.1117/12.787377
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From Conference Volume 7012

  • Ground-based and Airborne Telescopes II
  • Larry M. Stepp; Roberto Gilmozzi
  • Marseille, France | June 23, 2008

abstract

This paper presents a non-contact optical metrology measuring the pistons and tip/tilt angles of the 61 hexagonal segments of a compact-sized segmented mirror. The instrument has been developed within the scope of a design study for a European Extremely Large Telescope (E-ELT). It is used as reference sensor for cophasing of the mirror segments in closed loop control. The mirror shape is also measured by different types of stellar light-based phasing cameras whose performances will be evaluated with regard to a future E-ELT. Following a description of the system architecture, the second part of the paper presents experimental results demonstrating the level of precision: 0.48nm RMS in piston and 0.074 μrad RMS in tip and tilt.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Rainer Wilhelm ; Bruno Luong ; Alain Courteville ; Sébastien Estival and Frédéric Gonté
"Optical phasing of a segmented mirror with sub-nanometer precision: experimental results of the APE Internal Metrology", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701212 (August 27, 2008); doi:10.1117/12.787377; http://dx.doi.org/10.1117/12.787377


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