dorsal/arxiv
View SchemaLight propagation through closed-loop atomic media beyond the multiphoton resonance condition
| Authors | Mohammad Mahmoudi, Joerg Evers |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0609206 |
| URL | https://arxiv.org/abs/quant-ph/0609206 |
| DOI | 10.1103/PhysRevA.74.063827 |
| Journal | Phys. Rev. A. 74, 063827 (2006) |
Abstract
The light propagation of a probe field pulse in a four-level double-lambda type system driven by laser fields that form a closed interaction loop is studied. Due to the finite frequency width of the probe pulse, a time-independent analysis relying on the multiphoton resonance assumption is insufficient. Thus we apply a Floquet decomposition of the equations of motion to solve the time-dependent problem beyond the multiphoton resonance condition. We find that the various Floquet components can be interpreted in terms of different scattering processes, and that the medium response oscillating in phase with the probe field in general is not phase-dependent. The phase dependence arises from a scattering of the coupling fields into the probe field mode at a frequency which in general differs from the probe field frequency. We thus conclude that in particular for short pulses with a large frequency width, inducing a closed loop interaction contour may not be advantageous, since otherwise the phase-dependent medium response may lead to a distortion of the pulse shape. Finally, using our time-dependent analysis, we demonstrate that both the closed-loop and the non-closed loop configuration allow for sub- and superluminal light propagation with small absorption or even gain. Further, we identify one of the coupling field Rabi frequencies as a control parameter that allows to conveniently switch between sub- and superluminal light propagation.
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"abstract": "The light propagation of a probe field pulse in a four-level double-lambda\ntype system driven by laser fields that form a closed interaction loop is\nstudied. Due to the finite frequency width of the probe pulse, a\ntime-independent analysis relying on the multiphoton resonance assumption is\ninsufficient. Thus we apply a Floquet decomposition of the equations of motion\nto solve the time-dependent problem beyond the multiphoton resonance condition.\nWe find that the various Floquet components can be interpreted in terms of\ndifferent scattering processes, and that the medium response oscillating in\nphase with the probe field in general is not phase-dependent. The phase\ndependence arises from a scattering of the coupling fields into the probe field\nmode at a frequency which in general differs from the probe field frequency. We\nthus conclude that in particular for short pulses with a large frequency width,\ninducing a closed loop interaction contour may not be advantageous, since\notherwise the phase-dependent medium response may lead to a distortion of the\npulse shape. Finally, using our time-dependent analysis, we demonstrate that\nboth the closed-loop and the non-closed loop configuration allow for sub- and\nsuperluminal light propagation with small absorption or even gain. Further, we\nidentify one of the coupling field Rabi frequencies as a control parameter that\nallows to conveniently switch between sub- and superluminal light propagation.",
"arxiv_id": "quant-ph/0609206",
"authors": [
"Mohammad Mahmoudi",
"Joerg Evers"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.74.063827",
"journal_ref": "Phys. Rev. A. 74, 063827 (2006)",
"title": "Light propagation through closed-loop atomic media beyond the multiphoton resonance condition",
"url": "https://arxiv.org/abs/quant-ph/0609206"
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