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The effect of spontaneously generated coherence on dynamical evolution of a multi-level atomic system consisting of three upper levels and a lower level is studied. For degenerate upper levels the population trapping in these levels increases in the steady state.
We propose a new and simple semiclassical model to analyze sub-Poissonian light in high-impedance, constant-current-driven semiconductor light emitters, and obtain some new and interesting results. Our study shows that the model gives a simple and distinct physical picture to explain the suppression mechanism of intensity noise in high-impedance-driven semiconductor light emitters.
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