Relation Between Electric Field-Induced Optical Rectification and Electro-Optic Kerr Effect in Macromolecular Solutions
The conditions for a relationship between the new effect of Electric Field-Induced Optical Rectification (EFIOR) and the Electro-Optical Kerr Effect (EOKE) are analyzed. Measurements of the two effects yield the same information only in the case of molecular substances, acted on by a static electric field of not excessive strength. We show that in solutions of macromolecules exhibiting considerable reorientation effects of permanent and induced electric dipoles, the above relation between the two methods does not hold since, under external conditions, optical saturation of macromolecular alignment takes place in EFIOR whereas it is electric saturation in EOKE. We prove however that the measurement of laser light — induced electric anisotropy leads to identical results as EFIOR in the molecular as well as macromolecular case.
KeywordsElectric Dipole Static Electric Field Permanent Dipole Moment Molecular Substance Electric Anisotropy
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