Nonlinear carrier dynamics in GaxIn1−xAsyP1−y compounds

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Abstract
The nonlinear recovery dynamics of optically excited carriers in thin layer samples of GaInAsP (1.3 μm, 1.55 μm) and GaInAs (1.65 μm) have been studied by picosecond optical pump-probe measurements of absorption bleaching using pulses at 1.06 μm for both pump and probe. An evaluation of the data was performed by a careful computer model which takes into account the temporal development of the carrier density and absorption, the spatial averaging of the bleaching, and a convolution with the probe beam. The effective Auger coefficients, determined as curve fitting parameters, were found to be A(1.3 μm)=1.5×10−29 cm6/s, A(1.55 μm) =7.5×10−29 cm6/s, and A(1.65 μm)=9.8×10−29 cm6/s.