Karabulut, IUnlu, SSafak, H2020-03-262020-03-2620050370-19721521-3951https://dx.doi.org/10.1002/pssb.200541093https://hdl.handle.net/20.500.12395/19619Analytic forms of the changes of the absorption and refractive index associated with intersubband optical transitions in a quantum box are obtained by using the compact density matrix approach. Numerical results are presented for a typical AlGaAs/GaAs quantum box system. The linear, third-order nonlinear, and total refractive-index and absorption changes are examined as a function of the incident optical intensity. The results obtained show that the incident optical intensity has a great effect on the total absorption and refractive-index changes.en10.1002/pssb.200541093info:eu-repo/semantics/openAccessArticle2421429022909Q3WOS:000233477900018Q3