Patent ID: 11959737
Assignee: UNITY SEMICONDUCTOR
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 9:
10. The system according to claim 9, characterized in that, for the structure, the first data comprises a top critical dimension (“top-CD”) data relating to a width of said structure, the adjustment unit comprising means for adjusting the diameter, on the top surface, of the measurement beam, wherein the means for adjusting the diameter comprise:
a turret for changing at least one optical element placed on the path of the measurement beam between the interferometer and the top surface;
an optical element with adjustable focal length, placed on the path of the measurement beam between the interferometer and the top surface; and/or
a beam expander with adjustable numerical aperture, placed on the path of the measurement beam between the interferometer and the top surface.