The intervalence absorption in InAs/InGaSb/InAs type-Il 4 micrometers quantum well laser structure was investigated using band-edge nonlinear pump- probe spectroscopy techniques where two pump beams chopped at different frequencies are used to excite the sample. The spectrally resolved probe nonlinearity is measured at the sum frequency. Given their different characteristic nonlinearities, the contribution of the intervalence absorption process (IVA) was resolved from that of the interband gain dynamics. The IVA ...
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