Abstract
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 without population inversion in the bare state can emerge on the lower frequency side of the resonant transition only. This result could be understood as population inversion in the dressed state representation.
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