Abstract
We first describe an unconventional Lau experiment that is performed with
a collimated He–Ne laser beam. We then describe an elegant experimental
arrangement in which a collimated He–Ne laser beam is gradually rendered
spatially incoherent; this demonstrates the evolution of the Lau fringes from
the Fraunhofer diffraction pattern of the two gratings in the Lau
setup.
© 1997 Optical Society of America
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