Patent ID: 10187964

Abstract:
Calibrating apparatus and method for correcting aberrations in an extreme ultraviolet (EUV) light source are provided. A calibrating apparatus includes an illuminant positioned at a radiating position, including a plurality of light sources arranged along a straight scanning direction, the plurality of light sources emitting light sequentially; a condenser stage configured to carry a to-be-corrected condenser mirror and drive the to-be-corrected condenser mirror to rotationally scan so that a reflective ellipsoidal surface of the to-be-corrected condenser mirror collects light emitted by the light sources and converge collected light at a center of focus through reflection; and an array detector positioned at the center of focus configured to detect light reflected by the to-be-corrected condenser mirror to obtain a detection spot, the array detector including a standard center point overlapping with the center of focus for comparing a position difference between the detection spot and the standard center point.