Abstract
A theory of the nonsteady-state absorption of supershort light pulses in bulk materials and heterostructures with quantum wells and wires when multiphoton resonance at interband transitions occurs is developed.The absorbed energy dependence on the detunings of the multiphoton resonance and on the pulse width is investigated. The interaction between two consecutive short pulses (pump-probe spectroscopy within the femtosecond regime) with bulk crystals and low-dimensional structures under the conditions of two-photon resonance at interband transitions and transitions between size-quantized sublevels is studied.
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