Crystal optics of high energy γ-beams

Using the conception of the single crystal as a region of electrical field, generated by spatially ordered atoms, we have determined the tensor of dielectric permeability for ≥ 1 GeV photons in the region of crystal orientation, which corresponds to ±- pair coherent production. The polarization characteristics of normal EM wave propagation in the crystals were found with the help of this tensor. In particular, it was shown, that there exist solutions of a dispersion equation for elliptied polarized waves. Other EM processes in the crystals, in particular, Cherenkov radiation of charged particles, were considered. 18 refs.; 6 figs