Abstract

The effects of an arbitrary small inclination between the two crossed gratings on moiré fringes in Talbot interferometry are discussed. The small inclination is formed by the rotation by a small angle γ of the beam splitter’s grating about the axis that is on the plane of the grating and has an arbitrary angle δ with respect to the lines of the grating. The results indicate that the small inclination has a great influence on measurements for which Talbot interferometry is applied, such as beam collimation and measurement of the focal length of a lens. The theoretical analyses are proved by experimental results. Some methods for judging the size of a small inclination are also proposed.

© 2001 Optical Society of America

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