Abstract
Photon-gated spectral holeburning uses two photons to bleach a narrow hole in an inhomogeneously broadened absorption. A brief review is given of the inorganic and organic materials known to exhibit this phenomenon, with emphasis on the inorganic systems BaClF:Sm 2+, CaF 2:Sm 2+, LiGa 5O 8:Co 2+ and SrTiO 3:Cr 3+. In all these cases photoionization of the impurity ion is believed to be the mechanism of photobleaching.
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