PATTERN GENERATOR OF FRESNEL ZONE PLATE

摘要

PURPOSE:To form an interference pattern of a Fresnel zone plate for X-ray imaging by bisecting the luminous flux from one spot light source with a beam splitter, reflecting respectively the split beams with spherical mirrors and condensing the beams to different two points on the common optical axis of both spherical mirrors which are optically superposed. CONSTITUTION:The laser beam from a laser light source 1 is condensed to a point P to form a divergent luminous flux which is then bisected by a beam splitter 3. The luminous flux reflected by the splitter 3 is made incident to a concave spherical mirror M by which the luminous flux is reflected to condense at the point O. The luminous flux transmitted through the splitter 3 is reflected by a concave spherical mirror M' and is corrected in spherical aberration by an aberration correcting lens L. The corrected flux is reflected by the splitter 3 and is condensed at the point I. The point I is on the optical axis of the mirror M together with the point O and the recording carrier F for the interference pattern is set at the intermediate of the point O and the point I and said pattern is recorded thereto.