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
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques
Qian Liu and Ryoji Ohba, "General Inclination Effects Produced by a Beam-Splitter Grating in Talbot Interferometry with Crossed Gratings," Appl. Opt. 40, 5938-5942 (2001)