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Light beams focusing in periodically non-uniform
crystalline medium
Kurilkina S.N.
Department of Optics, Gomel State University Sovietskaya
St., 104, 246699, Gomel, Belarus
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In the present paper the peculiarities of propagation and diffraction
of optical waves in the crystalline periodically non-uniform media are
considered. The dependence of light beam divergence in the crystal on curvatures
of wave vector surface is obtained. It is shown, that presence of the periodic
non-uniformity of the crystal and natural anisotropy lead to essential
deformation of wave vector surface, namely, to the appearance of local
regions with negative curvature and, hence, to the effect of light focusing
in corresponding directions. The application of uniform electric field
may intensify the light focusing. The crystalline diffraction lenses are
proposed which are controlled by electric field and variation of incident
light polarization.
doi 10.3116/16091833/3/1/19/2002 |
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