Active optics for high-dynamic variable curvature mirrors
  Variable curvature mirrors of large amplitude are designed by using finite element analysis. The specific case studied reaches at least a 800 {\mu}m sag with an optical quality better than {\lambda}/5 over a 120 mm clear aperture. We highlight the geometrical nonlinearity and the plasticity effect. 
Emmanuel Hugot, Marc Ferrari, Gerard R. Lemaitre, Fabrice Madec,   Sebastien Vives, Elodie Chardin, David Le Mignant, Jean G...
astro-ph.IM