CONDENSER AND COLLECTING SYSTEM TO COLLECT ELECTROMAGNETIC RADIATION Russian patent published in 2000 - IPC

FIELD: optics. SUBSTANCE: condenser and collecting system includes main reflector, source of electromagnetic radiation and object. Concave part of reflecting surface of main reflector defines optical axis and center of curvature lying on optical axis. Source and object are located on optical axis but displaced correspondingly by first and second distances from specified center of curvature. First and second distances are approximately tied up by expression (1-Z_s/r₁)x(1-Z_i/r₁)= 1, where Z_s is first distance; Z_i is second distance; r₁ is radius of curvature corresponding to specified center of curvature. If concave part of surface has toroidal shape then first and second radii of curvature have different length to diminish optical aberrations caused by envelope of source. System can include auxiliary reflector placed opposite to concave part of reflecting surface of main reflector. It can have case whose internal surfaces form main and auxiliary reflectors. Case can be fitted with cover and bottom attached to its walls to form gas- tight structure that can be filled with compressed gas. EFFECT: improved collecting properties and reduced astigmatic aberrations. 23 cl, 7 dwg