Abstract
A theoretical study is presented of the coherent and incoherent interaction of a pump CO2-laser and a probe CO2-laser in p-type Ge. The dominant absorption mechanism of the optical beams is direct intervalence-band transitions between states in the heavy- and light-hole bands. The hole states in resonance with the pump tend to saturate at sufficiently high intensities due to changes in the occupation probabilities of the initial and final states. When the material is simultaneously irradiated by the pump and probe beams, there is a nonlinear response which produces a component in the hole population difference between the heavy- and light-hole bands which oscillates at the beat frequency. This oscillating component in the population difference acts as a spatial and temporal grating which mixes the two beams. Calculations of the probe absorption as a function of the frequency difference between the probe and pump beams are presented.
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