1. Reminder of the main stages of production

Before turning to the production technologies, and to make the article easier to read, the following glossary gives the main terms that will be used:

• shape defect: deviation in shape from the desired theoretical surface. The term "flatness" is often used as a synonym for both flat and uneven surfaces;

• PTV: Peak To Valley: the maximum amplitude of the shape defect (maximum – minimum);

• Rms: Root mean square ;

• Ra: term expressing the arithmetic mean deviation ;

• MRF: MagnetoRheological Finishing;

• FJP: Fluid Jet Propulsion.

To create an optical surface, the following main principles apply...