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International Journal of Modern Physics B

LASING WITH AND WITHOUT POPULATION INVERSION IN A QUANTUM DOT NANOSTRUCTURE VIA AN INCOHERENT PUMPING FIELD

Seyyed Hossein Asadpour, Elnaz Ahmadi Sangachin

Published Jun 5, 2012• 5 citations
Publisher

Abstract

The effect of incoherent pumping field on absorption spectrum and population inversion in a four-level quantum dot nanostructure are investigated. It is found that with incoherent pumping field the probe field absorption can be converted to probe field gain. Also, it is found that with combine effect of incoherent pumping field and electron tunneling the lasing can be obtained in the absence or presence of population inversion.

DOI
10.1142/s0217979212500944

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The effect of incoherent pumping field on absorption spectrum and population inversion in a four-level quantum dot nanostructure are investigated. It is found that with incoherent pumping field the probe field absorption can be converted to probe field gain. Also, it is found that with combine effect of incoherent pumping field and electron tunneling the lasing can be obtained in the absence or presence of population inversion.
For a four-level atomic system with a doublet of closely spaced levels, we find that, owing to the coherence that results from the vacuum of the radiation field, population trapping at excited levels and probe gain with population inversion can be achieved with weak incoherent pumping. This gain is different from both the conventional lasing gain and gain without inversion in that there exists population inversion on probe transitions but the inversion is achieved by the vacuum-induced coherence.
In the open and closed ladder systems with vacuum induced coherence,it is found that the relative phase between the probe and driving fields has an important manipulation role on the absorption property,while the incoherent pumping has a considerable effect on the phase-dependent absorption property.In both systems,by adjusting the incoherent pumping the switching from absorption to gain and from lasing with inversion to lasing without inversion can be realized and the largest inversionless gain can be gotten.However,when the incoherent pumping is absent,for any value of the relative phase,lasing without inversion still can not be obtained in the closed system but it is able in the open system;and in the open system,for suitable values of the relative phase,inversionless gain gotten when the incoherent pumping is absent is obviously larger than that obtained when the incoherent pumping presents.
A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.
Abstract The transient gain-absorption properties of the probe field in vertical triple quantum dots assisted by double tunneling and incoherent pumping are investigated. With a proper intensity value and detuning of the second tunneling, the transient gain in triple quantum dots with incoherent pumping can be completely eliminated. In addition, the incoherent pumping affects both the amplitude of the transient absorption and the steady-state value. The dependence of transient behaviors on other parameters, such as the radiative decay rate and the pure dephasing decay rate of the quantum dots, is also discussed. The scheme may have important applications in quantum information networks and communication.
We discuss the effects of the incoherent pumping in both probe and coupling channels on the absorption and dispersion of the probe laser with quantum interference. The incoherent population pumping in the coupling channel decreases the probe transparency. When decay rate in the coupling channel is greater than that in the probe channel, the incoherent population pumping in the probe channel can create the gain without inversion. The probe absorption pattern is upsidedown if the interference is present. When the decay rates in the probe and channels are equal, the incoherent pumping in the probe channel doesn't create the gain until the existence of the interference.