مواد الکترو اپتیک

Electrooptic Materials

مواد الکترو اپتیک

ABSTRACT

The term electrooptic effect refers  to a change in the refractive index of a transparent substance induced by an applied electric field , usually at a frequency below the optic vibrational resonance of the lattice or the molecules involved . the linear and quadratic electrooptic effects are known as the Pockels and kerr effects, respectively . The linear electrooptic ( or Pockels ) effect refers to a change in relative optical dielectric impermeability (B_ij) proportional to an applied electric field E_k whos highest frequencies are below the lattice resonance of a crystal .Refractive index of a crystal : Considering light propagation through a crystal the electromagnetic energy stored in a unit volume of dielectric is represented by an ellipsoid whit a geometry that reflects the symmetry of the crystal .