System and method to compensate for critical dimension...

Optics: measuring and testing – By polarized light examination – With polariscopes

Reexamination Certificate

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C356S364000

Reexamination Certificate

active

07548315

ABSTRACT:
A system and method are used to compensate for critical dimension non-uniformity caused by different polarization directions in an illumination beam. A system comprises a source of radiation and an optical system. The source of radiation produces a beam of radiation. The optical system is configured to transmit a first portion of the beam having a first polarization direction during a first portion of a cycle and a second portion of the beam having a second polarization direction during a second portion of the cycle.

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