Polarization-dependent lasing gain in GaAsl AIGaAs multi-quantum-welllasers is theoretically calculated and experimentally determined. The dipole moment representing the electron transition is calculated based on the k·P perturbation method. Gain broadening due to the intraband relaxation of electron wave is also taken into account. Experimentally measured gain profiles ofTE and TM modes agree well with the theoretical results.
The transference of the AFP-L3 fraction might be relatively high in the placentas of women carrying a trisomy 21 fetus, and this could be the one of the reasons for the increase in the percentage of AFP-L3 in the maternal serum in pregnancies with a trisomy 21 fetus.
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