AN ABERRATION CORRECTION OPTICAL SYSTEM
    21.
    发明公开

    公开(公告)号:EP4354200A1

    公开(公告)日:2024-04-17

    申请号:EP22200778.3

    申请日:2022-10-11

    Abstract: An optical arrangement for aberration correction, comprising: a beam dispersing element for spatially dispersing a broadband radiation beam in a first transverse direction; a focusing lens for focusing the broadband radiation beam subsequently to said dispersing, wherein said focusing lens is arranged such that the dispersed broadband radiation beam passes through at least one off-center position of the focusing lens in at least one pass, wherein said off-center position is a position displaced from a center of the focusing lens in a second transverse direction, wherein the first transverse direction and the second transverse direction are mutually perpendicular and parallel to a focal plane of the focusing lens; and at least one aberration compensating lens displaced in the second transverse direction with respect to at least part of the broadband radiation beam so as to substantially compensate for lateral chromatic aberration..

    ILLUMINATION MODULE AND ASSOCIATED METHODS AND METROLOGY APPARATUS

    公开(公告)号:EP4279994A1

    公开(公告)日:2023-11-22

    申请号:EP22174619.1

    申请日:2022-05-20

    Abstract: Disclosed is an illumination module for a metrology device. The illumination module comprises a configurable illumination module operable to provide measurement illumination over a configurable range of illumination angles, a grating light valve module (GLV) for controllably configuring a spectral configuration of the measurement illumination; and a controller operable to control the configurable illumination module and the grating light valve module such that the spectral configuration of the measurement illumination is varied in dependence with illumination angle within the range of illumination angles so as to obtain a desired detection condition for detection of diffracted radiation from a diffractive structure resultant from a measurement of the diffractive structure using the measurement illumination.

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