Abstract
Linear and nonlinear interactions of an electromagnetic wave with molecules of an isotropic medium induce in them multipole moments which contribute to electric polarization of the system [1]. Out of absorption bands optical rectification (OR) via the second-order susceptibility is forbidden but the fourth-order dipolar electric nonlinearity may cause OR in chiral liquids [2]. However, in absorption bands of optically active molecular system OR is allowed via the imaginary part of the Second-order susceptibility related to electric dipole interaction with the radiation field [3]. We consider an isotropic molecular system in which a plane monochromatic light wave with the electric field
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