Open Access

This article has an erratum: [erratum]

Fig. 3.

image

Schematic representations of common defects on the prism apex and their impact on quadrant positioning. Panel a: nominal design of the pyramid apex: quadrants lie on a perfect square, although the side length of the square needs not match an integer multiple of the pixel size. Panel b: polishing angle of facet B is excessive, shifting outward edges of facet B; quadrant B is moved away from the optical axis and receives more flux, whereas A and D receive less. Panel c: facet polishing depth is unequal, creating a roof apex. Intensities at zero-phase point are modified.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.