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

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [34 references]  Display  Hide  Download

https://hal-ensta-paris.archives-ouvertes.fr//hal-01118170
Contributor : Aurélien Houard <>
Submitted on : Wednesday, February 18, 2015 - 3:40:05 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM
Long-term archiving on : Tuesday, May 19, 2015 - 10:37:13 AM

File

Lasing of ambient air_author_p...
Files produced by the author(s)

Identifiers

Collections

Citation

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, Optical Society of America, 2014, 39, pp.1725. ⟨10.1364/OL.39.001725⟩. ⟨hal-01118170⟩

Share

Metrics

Record views

312

Files downloads

142