photochemical hole burning (PHB)

photochemical hole burning (PHB)

An optical memory technique, in which a laser in the visible waveband is directed at a microscopic point on the surface of a slice of glass which has been doped with organic dyes or rare-earth elements. The laser excites electrons in the glass such that they change the absorption characteristics of that area of the glass and leave a band, or hole, in the absorption spectrum.

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