Nuclear optical Kerr effect

Besides these molecular motions, an optical field could also induce other types of orientation effects in liquid crystalhne systems, for example, nuclear reorientation caused by the field-induced nuclear orientational anisotropy. This process is sometimes referred to as the nuclear optical Kerr effect as it results in an optical intensity-dependent change in the optical dielectric constant. Such effects in liquid crystals have been investigated by Deeg and Payer. In general, these nuclear... 

NMR. nuclear magnetic resonance non-bridging oxygens (NBO), 25 nonlinear optical properties nonlinear electron polarization, 389 optical Kerr effect, 389 optical susceptibility, 389 second harmonic generation, 389 ultrafast response, 389 non-Newtonian flow, 240 non-oxides, 47... 

Quasielectric Light Scattering and Order Fluctuations in the Isotropic Phase 174 Nuclear Magnetic Resonance and Order Fluctuations in the Isotropic Phase. 175 Quasielastic Light Scattering and Orientational Fluctuations below Tc. . . 177 Nuclear Magnetic Resonance and Orientational Fluctuations below Tc.. .. 177 Optical Kerr Effect and Transient Laser-Induced Molecular Reorientation.. 181... 

The argument Rp implies structure relaxation in the field, and P" means the nuclear relaxation part of P, while the subscript oc oo invokes the so-called infinite optical frequency (lOF) approximation. In principle, this procedure allows one to obtain most of the major dynamic vibrational NR contributions in addition to the purely static ones of Eqs.4.5. 7. The linear term in the electric field expansion of Eq. (4) gives the dc-Pockels effect the quadratic term gives the optical Kerr Effect and the linear term in the expansion of beta yields dc-second harmonic generation (all in the lOF approximation). For laser frequencies in the optical region it has been demonstrated that the latter approximation is normally quite accurate [29-31]. In fact, this approximation is equivalent to neglecting terms of the order with respect to unity (coy is a vibrational frequency). In terms of Bishop and Kirt-man perturbation theory [32-34] all vibrational contributions through first-order in mechanical and/or electrical anharmonicity, and some of second-order, are included in the NR treatment [35]. 

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