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We investigate the effect of Doppler broadening on the spectrum of resonance fluorescence of a two-level atomic system driven by a coherent field, and find that the spectrum depends on the viewed direction. We also suggest the best way to decrease inhomogeneous broadening in these experiments.
In the presence of a coherent coupling between intersubbands of the conduction band in a semiconductor quantum well, light amplification without inversion is investigated by solving the density matrix equation and analyzed by the electron renormalization theory. The quasi-Fermi energy level is used to take the place of injection rate. This shows that the amplification of the interband transition...
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