Av. Petukhov et T. Rasing, CRYSTALLINITY EFFECT ON THE INFRARED-VISIBLE SUM-FREQUENCY GENERATIONIN NOBLE-METALS, Surface science, 377(1-3), 1997, pp. 414-417
The quadrupole-allowed three-wave mixing (omega(1) + omega(2) = omega(
3)) in an anisotropic electron gas is calculated using the Boltzmann e
quation. The nonlinear polarizabilities are evaluated within a two-ban
d model suitable for description of the optical response of noble meta
ls at frequencies below the d-band transitions. For the infrared-visib
le (omega(1) much greater than omega(2)) sum-frequency generation the
effects of the lattice structure are found to be much stronger than th
ose for the degenerate (omega(1) = omega(2)) second-harmonic generatio
n.