Transient gain from $N_2^+$ in light filaments.
We perform high resolution spectroscopy of $N_2^+$ emission in light filaments using a controlled pump at 795 followed by a second harmonic weak probe. Our result suggests that transient gain is achieved by resonant stimulated Raman scattering.
Publisher URL: http://arxiv.org/abs/1802.00063
DOI: arXiv:1802.00063v1
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