Abstract
A model of inversionless gain on a transition between quasi-discrete excited levels of a quantum system is proposed that minimizes the absorption of a coherent optical pump beam due to the finite lifetimes of the corresponding states. A quantum-dot system with transition frequency between quasi-discrete levels lying in the mid-infrared (mid-IR) range is used as an example to determine an optimal pump frequency at which the pump absorption rate is minimized and to calculate the gain for a mid-IR field. The proposed model system can be considered as a prototype for creating highly efficient mid- and far-IR quantum-dot amplifiers and lasers operating on transitions between quasi-discrete levels at room temperature.
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