Аңдатпа
The frequency-temperature dependences of the probability of two-photon absorption (2PA), caused by transitions from the branch of light holes to the subband of spin-orbit splitting and linear-circular dichroism (LCD) associated with 2PA, as well as the coefficient of two-photon light absorption in GaAs and InAs, where the contribution to the absorption of the effect of coherent saturation. The role of various types of transitions, differing from each other in virtual states and participating in the 2PT, is analyzed. In GaAs and InAs, the presence of several peaks in the frequency-temperature dependences of the 2PA coefficient was revealed; the appearance of the peaks is explained not only by a specific change in the distribution functions of photoexcited holes, but also by the fact that at certain frequency values, some denominators in the expressions of the composite matrix elements tend to zero.