Abstract
The properties of moiré fringes in Talbot interferometry are
analyzed when the angle between the two grating planes is
small. The results indicate that the tilt angle of the moiré
fringes, observed just behind the test grating, is sensitive to the
small angle. Based on this sensitivity, several features of
parallelism of the two grating planes are presented, and the influence
of the small angle when checking the beam collimation of a lens is also
discussed. The validity of the theoretical analysis is illustrated
by experiment.
© 1999 Optical Society of America
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