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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5547
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dc.contributor.authorNarayanan, Andal-
dc.contributor.authorSharma, A.-
dc.contributor.authorPreethi, T.M.-
dc.contributor.authorAbheera, H.-
dc.contributor.authorRamachandran, Hema-
dc.date.accessioned2013-04-22T11:18:59Z-
dc.date.available2013-04-22T11:18:59Z-
dc.date.issued2009-07-
dc.identifier.citationCanadian Journal of Physics, 2009, Vol.87, p 843-850en
dc.identifier.issn0008-4204-
dc.identifier.issn1208-6045(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/5547-
dc.descriptionRestricted Access.en
dc.description.abstractMulti-level gaseous atomic systems showing electromagnetically induced transparency (EIT) phenomenon also exhibit low light intensity nonlinear optical phenomena. This is primarily due to the supression of linear susceptibility for the probe light during EIT. Therefore under EIT, nonlinear interactions become appreciable even at very low light intensities. In particular, Kerr nonlinearity in N systems irradiated by three fields has been both experimentally and theoretically investigated. In this paper, we report an all optical observation of an absorptive three-photon resonance feature, of subnatural width, in a N level scheme of gaseous rubidium, at room temperature, in a novel geometry of three independent beams. The non-Doppler free configuration of the beam in which the absorption is seen is the first such feature reported in a beam that is not directly taking part in the transparency effect. We have demonstrated the velocity selective nature of this absorption and studied the contrast dependence on detuning from the fourth level. Density matrix calculations have been carried out for this geometry, the results of which are in qualitative agreement with the experiment.en
dc.language.isoenen
dc.publisherNRC Research Pressen
dc.relation.urihttp://dx.doi.org/10.1139/P09-023en
dc.rights2009 NRC Research Pressen
dc.titleHigher order nonlinearities in a non-Doppler free geometryen
dc.typeArticleen
Appears in Collections:Research Papers (LAMP)

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