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Journal Articles Optics Letters Year : 2014

Lasing of ambient air with microjoule pulse energy pumped by a multi terawatt IR femtosecond laser

Guillaume Point
Yi Liu
  • Function : Author
  • PersonId : 4334
  • IdHAL : yi-liu
Sergey Mitryukovskiy
Pengji Ding
Aurélien Houard
André Mysyrowicz

Abstract

We report on the lasing action of atmospheric air pumped by an 800 nm femtosecond laser pulse with peak power up to 4 TW. Lasing emission at 428 nm increases rapidly over a small range of pump laser power, followed by saturation above ∼1.5  TW. The maximum lasing pulse energy is measured at 2.6 μJ corresponding to an emission power in the MW range, while a maximum conversion efficiency of 3.5×10−5 is measured at moderate pump pulse energy. The optical gain inside the filament plasma is estimated to be in excess of 0.7/cm. Lasing emission shows a doughnut profile, reflecting the spatial distribution of the pump-generated white-light continuum that acts as a seed for the lasing. We attribute the pronounced saturation to the defocusing of the seed in the plasma amplifying region and to the saturation of the seed intensity.
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Dates and versions

hal-01118170 , version 1 (18-02-2015)

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Guillaume Point, Yi Liu, Yohann Brelet, Sergey Mitryukovskiy, Pengji Ding, et al.. Lasing of ambient air with microjoule pulse energy pumped by a multi terawatt IR femtosecond laser. Optics Letters, 2014, 39, pp.1725. ⟨10.1364/OL.39.001725⟩. ⟨hal-01118170⟩
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