Patent ID: 11885608
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. The ellipsometer of claim 9, wherein the coherence reduction element is a staircase prism having different lengths in an optical axis direction, in a shape of a staircase, in the direction in which the linear illumination area extends when viewed from above, orthogonal to the reflective plane, and
the staircase prism is configured to allow the illuminated light to be transmitted therethrough, such that each of the plurality of beams is transmitted through a respective stair portion from among a plurality of stair portions of the staircase prism that have a different length in the optical axis direction from each other, thereby allowing each of the plurality of beams to have the different optical path length from each other.