Abstract
Two-photon transitions near the absorption edge in a multiple quantum well (MQW) structure are important because, on one hand, they provide information about the energy states involved in the forbidden direct transitions1 and, on the other hand, the induced Kerr-like optical nonlinearity has potential for ultrafast nonlinear switching applications2. In this paper, we report the first direct measurements of the two-photon absorption coefficient β2 and nonlinear refractive-index n2 in GaAs/AlGaAs MQW channel waveguides from 1490 to 1660 nm. We observed significant differences between TE and TM modes for both β2 and n2.
© 1992 Optical Society of America
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