Abstract
The effects of an arbitrary small inclination between two cross
gratings on the moiré fringes in Talbot interferometry are
discussed when the frequencies of the grating differ in two
perpendicular directions. We show that the small angles, α and
β, by which the beam-splitter cross grating is rotated around the two
axes parallel to the two perpendicular line directions of the cross
grating, have a greater influence on the moiré fringes with cross
gratings than that with one-dimensional gratings. A simple and
practical detection method for the angles between the two unparallel
grating planes in Talbot interferometry is also proposed. The
theoretical analyses are proved by experimental results.
© 2000 Optical Society of America
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