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Population inversion in optically pumped asymmetric quantum well terahertz lasers

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Figure

FIG. 1. Schematic diagram of the energy levels and wave functions of athree-level asymmetric quantum well
FIG. 4. Ratio of the non-radiative lifetime in the upper laser level to that inthe lower level for the three-level systems.
FIG. 5. Population dependence of the ratio of the non-radiative lifetime inthe upper laser level to that in the lower level for the 2.8 THz three-levelstructure
Figure 8 shows thetially larger than the de-population rate for the three-levelsystemenergy
+2

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