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dc.contributor.authorAzarm, Ali
dc.contributor.authorCorkum, Paul
dc.contributor.authorPolynkin, Pavel
dc.date.accessioned2017-12-05T16:03:05Z
dc.date.available2017-12-05T16:03:05Z
dc.date.issued2017-11-07
dc.identifier.citationOptical gain in rotationally excited nitrogen molecular ions 2017, 96 (5) Physical Review Aen
dc.identifier.issn2469-9926
dc.identifier.issn2469-9934
dc.identifier.doi10.1103/PhysRevA.96.051401
dc.identifier.urihttp://hdl.handle.net/10150/626190
dc.description.abstractWe pump low-pressure nitrogen gas with ionizing femtosecond laser pulses at 1.5 mu m wavelength. The resulting rotationally excited N-2(+) 2 molecular ions generate directional, forward-propagating stimulated and isotropic spontaneous emissions at 428 nmwavelength. Through high-resolution spectroscopy of these emissions, we quantify rotational population distributions in the upper and lower emission levels. We show that these distributions are shifted with respect to each other, which has a strong influence on the transient optical gain in this system. Although we find that electronic population inversion exists in our particular experiment, we show that sufficient dissimilarity of rotational distributions in the upper and lower emission levels could, in principle, lead to gain without net electronic population inversion.
dc.description.sponsorshipU.S. Air Force Office of Scientific Research under MURI Award [FA9550-16-1-0013]en
dc.language.isoenen
dc.publisherAMER PHYSICAL SOCen
dc.relation.urlhttps://link.aps.org/doi/10.1103/PhysRevA.96.051401en
dc.rights©2017 American Physical Societyen
dc.titleOptical gain in rotationally excited nitrogen molecular ionsen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Coll Opt Scien
dc.identifier.journalPhysical Review Aen
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2018-05-18T04:52:56Z
html.description.abstractWe pump low-pressure nitrogen gas with ionizing femtosecond laser pulses at 1.5 mu m wavelength. The resulting rotationally excited N-2(+) 2 molecular ions generate directional, forward-propagating stimulated and isotropic spontaneous emissions at 428 nmwavelength. Through high-resolution spectroscopy of these emissions, we quantify rotational population distributions in the upper and lower emission levels. We show that these distributions are shifted with respect to each other, which has a strong influence on the transient optical gain in this system. Although we find that electronic population inversion exists in our particular experiment, we show that sufficient dissimilarity of rotational distributions in the upper and lower emission levels could, in principle, lead to gain without net electronic population inversion.


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