INSPECTION APPARATUS, LINEARLY MOVABLE BEAM DISPLACER, AND METHOD

    公开(公告)号:US20250044236A1

    公开(公告)日:2025-02-06

    申请号:US18843138

    申请日:2023-02-17

    Abstract: An inspection apparatus includes a radiation source, an optical system, and a detector. The radiation source is configured to generate a beam of radiation. The optical system is configured to receive and direct the beam along an optical axis and toward a target so as to produce scattered radiation from the target. The optical system includes a beam displacer. The beam displacer includes two or more reflective surfaces. The beam displacer is configured to receive the beam along the optical axis, perform reflections of the beam so as to displace the optical axis of the beam, move linearly in at least a first dimension to shift the displaced optical axis, and preserve an optical property of the beam such that the optical property is invariant to the linear movement. The detector is configured to receive the scattered radiation and to generate a measurement signal based on the scattered radiation.

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