The two-photon transitions from the confined states to the continuum in the semiconductor quantum wells and superlattices are considered theoretically. Both the two-photon absorption coefficient and the third order nonlinear susceptibility related to it are calculated. The results show that the nonlinear index of refraction as large as 10−9 cm2/W can be achieved in the important 10 μm region where the absorption is small, opening a possibility of operating nonlinear optical devices in the far infrared domain.
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Li et al. (1993) studied this question.