Abstract:
A relation between the vibrational nonlinear refractive index coefficient ${{n}_{2}}(\omega )$ and the vibrational cubic susceptibility $\chi^{(3)}(\omega';\omega', \omega,-\omega)$ has been analytically derived involving well-known optical, spectral, and thermal matter parameters. This relation allows one to estimate the nonlinear phase shift of low-power probe radiation at the frequency $\omega'$, which propagates in the field of a high-power terahertz pump wave at the frequency $\omega $. Theoretical estimates of the nonlinear susceptibility $\chi^{(3)}(\omega';\omega', \omega,-\omega)$ for water and fused silica for terahertz Kerr effect measurements have been obtained in good agreement with experimental data.
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