Abstract
We investigate the testing of collimation by Talbot interferometry
with circular gratings. Circular gratings are immune to
misalignment owing to rigid body rotations in a plane perpendicular to
the optic axis. Experimental results of the investigation are
presented, and they are in good agreement with the theoretical
predictions. Experimental results verify that collimation testing
with circular gratings can be superior to that with linear dual-field
gratings.
© 2001 Optical Society of America
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