Abstract

We investigate the interband difference-frequency-generation process arising from the three-wave interaction of resonant interband and intersubband coupling lights by theoretical estimation of the linear and the nonlinear susceptibilities of an asymmetric AlGaAs–GaAs quantum well. The three-level quantum-well system is analyzed by the perturbational density-matrix approach. The effect of the variation of carrier density in the quantum well on the interband mixing process is also considered. The nonlinear polarization induced by the intersubband coupling field is significantly enhanced in the case of doped structures. The peak second-order susceptibility estimated at the difference frequency is more than 2 orders of magnitude larger, whereas the coupling-field-induced third-order susceptibility is more than 4 orders of magnitude larger than that of bulk GaAs.

© 1997 Optical Society of America

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