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- W2767351954 abstract "We pump low-pressure nitrogen gas with ionizing femtosecond laser pulses at 1.5 $ensuremath{mu}mathrm{m}$ wavelength. The resulting rotationally excited ${mathrm{N}}_{2}^{+}$ molecular ions generate directional, forward-propagating stimulated and isotropic spontaneous emissions at 428 nm wavelength. 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." @default.
- W2767351954 created "2017-11-17" @default.
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- W2767351954 date "2017-11-07" @default.
- W2767351954 modified "2023-10-03" @default.
- W2767351954 title "Optical gain in rotationally excited nitrogen molecular ions" @default.
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- W2767351954 doi "https://doi.org/10.1103/physreva.96.051401" @default.
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