Patent ID: 6323896
Filing Date: 2001-11-27
Classification: G02B

Abstract:
A holographic device for formation of at least one light beam with predetermined spectral composition, characterized by the fact that it includes:a) flat mirror (7) formed by adjacent areas which are alternately transparent (6.sub.i) and reflecting (5.sub.i),b) at least identical first (4) and second (4') reflection holograms, each delivering at least one diffracted beam with said spectral composition,c) light source (1) for illumination said holograms (4,4') at roughly normal incidence by the intermediary of said mirror (7), said holograms (4,4' being arranged symmetrically with respect to the plane of said mirror (7), in such a way as to be illuminated by the intermediary of transparent (6.sub.i) and reflecting (5.sub.i) areas, respectively, of mirror (7), and in such a way that the beams diffracted by first (4) and second (4') holograms are reflected and transmitted, respectively, by reflecting (5.sub.i) and transparent (6.sub.i) areas, respectively, of mirror (7), in order to be combined into a continuous light beam with said spectral composition.