20 The a posteriori reconstitution of interference patterns

The laser beams are moved along the layer to create interference patterns in the sensitized layer.

More generally, the interferometer provides a flexible source for large-area, non-focused interference patterns of tuneable period.

This is observed in the dark areas of interference or diffraction patterns.

The probes do not necessarily destroy the interference patterns, but only the conditions of their observation.

The a posteriori reconstitution of interference patterns illustrates in a striking way the relativity, in the Everett sense, of the observed states with respect to the observer:

The double-slit experiment has also been performed using electrons, atoms, and even molecules, and the same type of interference pattern is seen.