Backward stimulated radiation from filaments in Nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses - ENSTA Paris - École nationale supérieure de techniques avancées Paris Access content directly
Journal Articles Optics Express Year : 2014

Backward stimulated radiation from filaments in Nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses

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

Abstract

We report on strong backward stimulated emission at 337 nm in Nitrogen gas pumped by circularly polarized femtosecond laser pulses at 800 nm. A distinct dependence of the backward UV spectrum on pump laser polarization and intensity is observed, pointing to the occurrence of backward amplified spontaneous emission inside filaments. We attribute the population inversion to inelastic collision between the free electrons produced by the pump laser and neutral N 2 molecules. The addition of Oxygen molecules is detrimental for the gain, reducing it to near threshold at atmospheric concentration.
Fichier principal
Vignette du fichier
backward stimulated radiations from filaments in nitrogen gas and air_author_proof.pdf (730.59 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01118205 , version 1 (18-02-2015)

Identifiers

Cite

Sergey Mitryukovskiy, Yi Liu, Pengji Ding, Aurélien Houard, André Mysyrowicz. Backward stimulated radiation from filaments in Nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses. Optics Express, 2014, 22, pp.12750. ⟨10.1364/OE.22.012750⟩. ⟨hal-01118205⟩
352 View
157 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More