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Study on the Gain Material with Four Energy Level Model Using FDTD Method

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Figure

Figure 1. Schematic of the four-level atomic system model.
Figure 2. Schematic of the simulated structure.
Figure 3. The Electric field of the reflected wave, transmitted wave, the Fourier transform results, and the normalized dif-ference of electron number between the upper level and lower level under different pump rate
Figure 5. The lasing time of two situations under different pump rates.

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