Hyperpolarizability dispersion measured for neon

The hyperpolarizability of neon (γNe) is determined by an electric-field-induced second-harmonic-generation (ESHG) experiment at several wavelengths in the visible region. The deviation from Kleinman symmetry is also measured. The dispersion curve obtained from this experiment allows one to critically assess the previous nonlinear-optical measurements for Ne and allows a reliable estimate of the static value of γNe. The bounds obtained for the static γNe are 75 a.u. γNe93 a.u. The results of recent ab initio calculations are considered in the light of this revised estimate for γNe. .AE