Optical reflector element, its method of fabrication, and an optical instrument implementing such elements

摘要

The invention provides an optical reflector element ( 1 ) for a beam of X-rays (R_x) or of gamma-rays or of high-energy particles at grazing incidence, the element being constituted by a stack of superposed silicon plates ( 10 - 12 ). Each plate ( 10 - 12 ) has a reflecting top face ( 101 - 121 ) possibly coated with a metallic film, a multilayer or a dispersive grating and a bottom face carrying ribs ( 100 - 120 ) forming spacers between two successive plates ( 10 - 11, 11 - 12 ), and defining determined spacing between two successive reflecting faces ( 101 - 121 ). The invention also provides optical instruments comprising several such elements, in particular a type I Wolter telescope comprising two mirrors in tandem having respective paraboloid and hyperboloid surfaces of revolution or a conical approximation thereof or