Table 11.

Frequency-dependent NLO response of styrene monomer, obtained at λ = 1064 nm: HRS response ${\mathrm{\beta }}_{\mathrm{H}\mathrm{R}\mathrm{S}}\left(-2\mathrm{\omega };\mathrm{\omega },\mathrm{\omega }\right)$ , $\mathrm{D}\mathrm{R}\left(-2\mathrm{\omega };\mathrm{\omega },\mathrm{\omega }\right)$ , degenerate four-wave mixing of the third-order response ${\mathrm{\gamma }}^{\mathrm{D}\mathrm{F}\mathrm{W}\mathrm{M}}$ and nonlinear refractive index ${\displaystyle n_2}$ .

parameters/method	ωB97XD
${\mathrm{\beta }}_{\mathrm{H}\mathrm{R}\mathrm{S}}\left(-2\mathrm{\omega };\mathrm{\omega },\mathrm{\omega }\right)$ (×10−30 esu)	0.357
$\mathrm{D}\mathrm{R}\left(-2\mathrm{\omega };\mathrm{\omega },\mathrm{\omega }\right)$	4.556
${\mathrm{\gamma }}^{\mathrm{D}\mathrm{F}\mathrm{W}\mathrm{M}}\left(\mathrm{\omega }\right)$ (×10−36 esu)	6.024
${\mathrm{\chi }}^{\mathrm{D}\mathrm{F}\mathrm{W}\mathrm{M}}\left(\mathrm{\omega }\right)$ (×10−22 m2 V−2)	1.891
${\displaystyle n_2\left(\omega \right)}$ (×10-20 m2W−1)	1.748