Table I.

Values of the parameters required for the evaluation of the Franz-Keldysh contributions to ${\chi }_{1111}^{(3)}$. Frequencies in eV, a_o in Bohr radii, μ_o in units of the free electron mass. p² has been taken equal to 0.4 for all materials.

	Ge	Si	GaAs
ωg	4.3	4.8	5.2
ωp	15.5	17.35	15.5
ϵ0 – 1	11	15	10
μ0	0.03	0.04	0.05
ω0	0.9	4	1.5
a0	10.7	10.3	10.7
ω1	2.2	3.3	3.0