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Excelitas Technologies Corp. - X-Cite Vitae LB 11/24
Photonics Dictionary

precision aperture

An accurately produced hole of any size and shape that is used as a masking device in an optical system. Pinhole apertures of accurate diameters often are produced by laser beam penetration or by driving a needle through thin metal. These apertures may be physical holes in solid material or holes formed by opaque material deposited on a transparent substrate.
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