Abstract
The disorder-induced transient optical four-wave mixing for a Frenkel exciton in a binary mixed crystal is theoretically investigated. We have clarified the role of static disorder in a wide range of disorder strength by using the coherent potential approximation. It is found that the weak disorder gives rise to exciton dephasing, and the strong disorder induces a photon echo signal. The crossover from homogeneous to inhomogeneous broadening with increasing disorder strength is systematically analyzed. In the case of off-resonant excitation, we find an oscillatory echolike signal inherent in the disorder-induced optical nonlinearity.
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