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Axicon gratings are computer generated holograms of equally spaced concentric circles printed on a plane substrate. When illuminated by a point source of light they create axes in space defined by a line between the point source and the center of the grating pattern. The axis can be viewed in either transmission or reflection with an autostigmatic microscope. The axis created by the grating can be located to less than 1 um in translation and depending on distance from the grating to less than 1 microradian in angle. Several examples of such a use in alignment are explained.
Robert E. Parks
"Alignment with axicon plane gratings", Proc. SPIE 10747, Optical System Alignment, Tolerancing, and Verification XII, 1074703 (18 September 2018); https://doi.org/10.1117/12.2316645
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Robert E. Parks, "Alignment with axicon plane gratings," Proc. SPIE 10747, Optical System Alignment, Tolerancing, and Verification XII, 1074703 (18 September 2018); https://doi.org/10.1117/12.2316645