Abstract

The two-photon absorption coefficient and the intensity-dependent refractive index associated with it are calculated for semiconductor quantum wells and quantum wires. It is shown analytically that in the limit of large dimensions the nonlinear response of quantum-confined structures becomes isotropic and approaches the nonlinear response of the bulk semiconductor despite the different gauges used in the calculations. The theoretical results are compared with the experiment, and the practical implications are discussed.

© 1994 Optical Society of America

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