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    Optical gain in rotationally excited nitrogen molecular ions

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    PhysRevA.96.051401.pdf
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    Author
    Azarm, Ali
    Corkum, Paul
    Polynkin, Pavel
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2017-11-07
    
    Metadata
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    Publisher
    AMER PHYSICAL SOC
    Citation
    Optical gain in rotationally excited nitrogen molecular ions 2017, 96 (5) Physical Review A
    Journal
    Physical Review A
    Rights
    © 2017 American Physical Society.
    Collection Information
    This 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.
    Abstract
    We 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.
    ISSN
    2469-9926
    2469-9934
    DOI
    10.1103/PhysRevA.96.051401
    Version
    Final published version
    Sponsors
    U.S. Air Force Office of Scientific Research under MURI Award [FA9550-16-1-0013]
    Additional Links
    https://link.aps.org/doi/10.1103/PhysRevA.96.051401
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevA.96.051401
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