Onera (office National D'etudes Et De Recherches Aerospatiales)

Office National D'etudes Et De Recherches Aerospatiales (onera)

Office National D'etudes Et De Recherches Aerospatiales

Onera

Sabrina Velghe

Riad Haidar

Nicolas Guerineau

Jerome Primot

Riad Haïdar

Jérôme Primot

Bruno Toulon

Nicolas Guérineau

Michel Tauvy

Riad Haiedar

The application relates to a method for analyzing the wave surface of a light beam from a source to the focus of a lens. The beam illuminates a sample on the analysis plane and having a defect. A diffraction grating of the plane is a conjugate of an analysis plane through a focal system. An image is formed in a plane at a distance from the grating plane and analyzed by processing means. The invention encodes this grating by a phase function resulting from the multiplication of two phase functions, a first exclusion function defining a meshing of useful zones transmitting the beam to be analyzed in the form of light pencil beams, and a second phase fundamental function which creates a phase opposition between two light pencil beams coming out of adjacent meshes of the exclusion grating.

Method, phase grating and device for analyzing a wave surface of a light beam

The method comprises positioning a diffraction grating with a two-dimensional meshing on the path of the beam to be analyzed and processing at least two interferograms of at least two different colors, each interferogram being obtained in a plane from two sub-beams with different diffraction orders. The invention can be used to analyze and correct divided wavefronts.

Wavefront analysis method involving multilateral interferometry with frequency difference

A method and a system for analyzing the wavefront of a light beam, wherein a diffraction grating is arranged in a plane perpendicular to the light beam to be analyzed and optically conjugated to the analysis plane. Different emerging beams of the grating interfere to generate an image having deformations linked to the gradients of the wavefront to be analyzed. The method is characterized in that the grating carries out the multiplication of an intensity function which is implemented by a two-dimensional grating with hexagonal meshing of surface S transmitting the light of the beam to be analyzed into plural emerging beams arranged in a hexagonal meshing, by an phase function which is implemented by a two-dimensional grating with hexagonal meshing of surfaceS which introduces a phase shift close to 2&#x3c0;/3 (modulo 2&#x3c0;) between two adjacent secondary beams.

Compact achromatic optical interferometer of the three-wave lateral shearing type

Growing community of inventors

Villebon sur Yvette, France

Sabrina Velghe