Abstract
Strong 1.06 μm radiation was shown to be capable of orientationally selective bleaching of the F2− colour centres in a crystal of LiF. Conditions were found under which only identically oriented F2− colour centres remained unbleached. Crystals in which the F2− centres remained identically oriented were used to find the polarisation characteristics of two-photon absorption. The rate of bleaching of the colour centres as a result of two-photon absorption by an excited state was proportional to cos2θ where θ is the angle between the orientation of the electric vector of the strong wave and the axis joining the fluorine vacancies in the F2− centres. The two-photon absorption cross section of the excited F2− centres was estimated to be σ2 = 3.5×10-51 s cm4.
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