title: Estimation of phase shifts linked only to the coating for a dielectric mirror.
abstract: The wavefront is an important characteristic for a dielectric mirror. Its measurement is usually performed with interferometers. We introduce a new method to evaluate only the coating wavefront distortion due to nonuniform thickness errors by using a reflectometer. This method uses some reflectance or transmittance maps at a wavenumber σ(m) for which the reflectance or transmittance factor variation is high. These variations are translated into some central wavenumber σ(c) variations, which enables the determination of a phase map from experimental treatment.
authors: Commissariat à l'Energie Atomique et aux Energies Alternatives, Direction des Applications Militaires, Le Ripault, F-37260 Monts, France. herve.piombini@cea.fr
authors: Hervé
authors: H
authors: Piombini