Purpose of the Project

Why the cylinder?  The cylindrical mirror is one element in the Coudé train used for astigmatism compensation in the system.

Solaris 3 web 
 ESO/José Francisco Salgado (josefrancisco.org)

Mirror specification:

  • Material: Zerodur
  • Diameter: 204 mm
  • Cylinder radius: 191 meters corresponds to -> sag 26,178 microns
  • Surface error <65 nm PVr over the full aperture


Goal: To minimize the surface error much below full aperture specification to test the company technology limitations.