Patent ID: 8654344

Claim:
A device for generating a secondary source from a primary optical source emitting a first beam at a first wavelength focused onto a rotating surface, with which said first beam interacts so as to generate a secondary beam, and including an optical device for controlling an orientation and a position of said rotating surface so as to determine an orientation and a position of an emission point of said secondary source on said surface, said optical device for controlling the orientation and the position of the rotating surface by interferometric measurement comprising: means for rotating said rotating surface, such that the rotating surface, in motion, continuously exposes a fresh surface to generate the secondary beam from interaction of the first beam with the rotating surface, wherein said interaction leads to destruction of an area of said rotating surface and generation of one of a X-UV, electron or proton beam; a control laser beam split into two branches, one of which is a fixed reference beam and the other of which is a mobile analysis beam; means for making said reference and analysis beams interfere so as to generate interference fringes; a camera to image the interference fringes carrying information about the orientation and position of said surface; means for analyzing said interference images; and means for generating a feedback loop for controlling the orientation and the position of said rotating surface based on the analysis of said signal carrying information.