Collimated light is
light whose rays are parallel and thus has a planar
wavefront. The word is derived from "co-linear" and implies light that does not disperse, even over an infinite distance. Light can be collimated by a number of processes, for instance to project a beam on a parabolic concave
mirror with the source at the
focus. Collimated light is sometimes said to be focused at infinity. A simple way to test a beam for proper collimation is the
shearing interferometer. In reality a perfectly collimated beam with no
divergence cannot be created due to the fundamental limitations of
diffraction, but in practice sufficiently low-divergence beams are considered collimated.
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