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The polarization dependence of three‐photon absorption in solids is developed using the Wigner‐Eckart theorem for finite symmetry groups. The expression for the absorption coefficient is separated into two parts: (i) The geometrical part, which depends on the polarization vectors of the three photons, (ii) the dynamical part, which contains the product of three electron‐photon matrix elements. New information can be gained by studying these two parts. An application to TlCl crystal is given and an experimental method is suggested.
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Hassan et al. (1981) studied this question.
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