Dispersion of the nonlinear optical susceptibility χ(3) in n-InSb in a magnetic field

A simple semiclassical model for the nonparabolic conduction band of InSb is used to calculate the third-order nonlinear optical susceptibility χ(3)(-ω3,ω1,ω1,-ω2) in the presence of a dc magnetic field. In particular, we find resonant contributions when the difference frequency ω2-ω1 is near the cyclotron frequency or twice the cyclotron frequency. The results of this model are compared to earlier experimental results. © 1972 The American Physical Society.