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Journal Articles Physical Review Letters Year : 2017

Unexpected Sensitivity of Nitrogen Ions Superradiant Emission on Pump Laser Wavelength and Duration

Pengji Ding
Shihua Chen
  • Function : Author
  • PersonId : 873461
Xiang Zhang
Aurélien Houard
Anne L'Huillier
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  • PersonId : 888560
Cord L. Arnold
  • Function : Author
  • PersonId : 964097
André Mysyrowicz

Abstract

Nitrogen molecules in ambient air exposed to an intense near-infrared femtosecond laser pulse give rise to cavity-free superradiant emission at 391.4 and 427.8 nm. An unexpected pulse duration-dependent cyclic variation of the superradiance intensity is observed when the central wavelength of the femtosecond pump laser pulse is finely tuned between 780 and 820 nm, and no signal occurs at the resonant wavelength of 782.8 nm (2ω 782.8 nm = ω 391.4 nm). On the basis of a semiclassical recollision model, we show that an interference of dipolar moments of excited ions created by electron recollisions explains this behavior.
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Dates and versions

hal-01648039 , version 1 (24-11-2017)

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Yi Liu, Pengji Ding, Neven Ibrakovic, Samuel N. Bengtsson, Shihua Chen, et al.. Unexpected Sensitivity of Nitrogen Ions Superradiant Emission on Pump Laser Wavelength and Duration. Physical Review Letters, 2017, 119 (20), pp.203205. ⟨10.1103/PhysRevLett.119.203205⟩. ⟨hal-01648039⟩
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