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Journal articles
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.
Cited literature [34 references]
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 : Tuesday, October 6, 2020 - 4:26:40 PM
Long-term archiving on: : Tuesday, May 19, 2015 - 10:37:13 AM
Contributor : Aurélien Houard <>
Submitted on : Wednesday, February 18, 2015 - 3:40:05 PM
Last modification on : Tuesday, October 6, 2020 - 4:26:40 PM
Long-term archiving on: : Tuesday, May 19, 2015 - 10:37:13 AM
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