Three-Photon Absorption in Semiconductors

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Abstract
The three-photon-transition absorption process is theoretically considered for different types of the energy-band model. It is shown that the present result reduces to the previous existing result for the case of the two-band model. It is also shown that if the effective mass of the electrons and the holes is anisotropic, the absorption process is dependent, in a very complicated way, on the polarization of the incident light.