2014/05/26 by Pengji Ding, Ding, Pengji, Sergey Mitryukovskiy +9
Physics and Astronomy · #FOS: Physical sciences #Laser-Matter Interactions and Applications #Laser-Plasma Interactions and Diagnostics #Optics (physics.optics) #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.48550/arxiv.1405.6497
openalex publication_date 2014/05/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recently, S. Mitryukovskiy et al. presented experimental evidence showing that backward stimulated radiation at 337 nm can be obtained from plasma filaments in nitrogen gas pumped by circularly polarized 800 nm femtosecond pulses (Opt. Express, 22, 12750 (2014)). Here, we report that this backward stimulated radiation is enhanced by a factor of ~ 16 in the presence of a seed pulse. This enhanced stimulated radiation can be either linearly or circularly polarized, dictated by the seeding pulse, which is distinct from the non-polarized nature of the ASE without seeding pulse. We also measured the spatial profile and estimated the energy of the radiation. This seeding effect confirms unambiguously the existence of population inversion between the C3Πu and B3Πg state of nitrogen molecules inside plasma filament and provides a possible solution to control the properties of this backward stimulated radiation.