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Abstract

An optical measurement system, the optical measurement system comprises optics, wherein the optics include a collection path and an illumination path and an objective lens. The optics is configured to acquire Raman spectrums of one or more structural elements located at a measurement site of the sample while being set-up to apply one or more optics parameters that comprise an illumination angle out of a set of multiple illumination angles that correspond to a numerical aperture of the objective lens. Each of the one or more structural elements has a dimension that ranges between one tenth of nanometer to one hundred microns; an optical spectrometer; a Raman detector that is downstream to the optical spectrometer; and a control unit that is configured to determine an expected radiation pattern to be detected by the Raman detector when the optics are set-up to apply the one or more optics parameters.

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First Claim