METHOD OF SPECTRAL AND SPATIAL SELECTION OF ELECTROMAGNETIC RADIATION Russian patent published in 1994 - IPC

FIELD: optical instrument engineering. SUBSTANCE: radiation flux is directed several times onto dispersing element by means of multi-variation reflecting system which has reflectors with curvilinear reflecting surface. Dispersing element is mounted either between the reflectors or in the lace of any reflector, moreover, in the latter variant the dispersing element is used as reflector. Additional dispersing elements are also used, and if so they are mounted either between the reflectors or in the place of the reflectors. In this case dispersing elements are used as reflectors. EFFECT: improved efficiency. 4 dwg