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The study of optical gain for terahertz quantum cascade laser using density matrix method

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Figure

Figure 1 Illustration of conduction band diagram under bias voltage and one period of a 4-level system shaded by grey
Figure 2 I-V curve extracted from the article Kumar [12] (experimental) and the result calculated using the the density matrix method
Figure 4 The calculated I-V using density matrix method and the calculated evolution of the gain for THz QCL with the change of current density

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