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

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [22 references]  Display  Hide  Download

https://hal-ensta-paris.archives-ouvertes.fr//hal-01118205
Contributor : Aurélien Houard <>
Submitted on : Wednesday, February 18, 2015 - 3:59:21 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM
Long-term archiving on : Tuesday, May 19, 2015 - 10:41:30 AM

File

backward stimulated radiations...
Files produced by the author(s)

Identifiers

Collections

Citation

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, Optical Society of America, 2014, 22, pp.12750. ⟨10.1364/OE.22.012750⟩. ⟨hal-01118205⟩

Share

Metrics

Record views

552

Files downloads

180