Random edge corrugation whose amplitude is of the same order as the width of that adjacent Fresnel zone reduces the Arago spot intensity.
12.
Recently, the Arago spot experiment was demonstrated with a supersonic expansion beam of deuterium molecules ( an example of neutral matter waves ).
13.
From an extended source the Arago spot is only affected marginally, since one can interpret the Arago spot as a point-spread function.
14.
From an extended source the Arago spot is only affected marginally, since one can interpret the Arago spot as a point-spread function.
15.
One of the ideas is to use the Arago spot as a straight line reference in alignment systems ( see Feier et al . ).
16.
An Arago spot of electrons, which also constitute matter waves, can be observed in transmission electron microscopes when examining circular structures of a certain size.
17.
Since the Arago spot is not easily observed in everyday situations, Poisson interpreted it as an absurd result and that it should disprove Fresnel's theory.
18.
The main reason why the Arago spot is hard to observe in circular shadows from conventional light sources is that such light sources are bad approximations of point sources.
19.
Arago later noted that the diffraction bright spot ( which later became known as both the Arago spot and the Poisson spot ) had already been observed by Joseph-Nicolas Delisle a century earlier.
20.
Only the width of the Arago spot intensity peak depends on the distances between source, circular object and screen, as well as the source's wavelength and the diameter of the circular object.
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