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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 12750–12759

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

Sergey Mitryukovskiy, Yi Liu, Pengji Ding, Aurélien Houard, and André Mysyrowicz  »View Author Affiliations


Optics Express, Vol. 22, Issue 11, pp. 12750-12759 (2014)
http://dx.doi.org/10.1364/OE.22.012750


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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 N2 molecules. The addition of oxygen molecules is detrimental for the gain, reducing it to near threshold at atmospheric concentration.

© 2014 Optical Society of America

OCIS Codes
(140.4130) Lasers and laser optics : Molecular gas lasers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

History
Original Manuscript: February 20, 2014
Revised Manuscript: April 2, 2014
Manuscript Accepted: April 7, 2014
Published: May 19, 2014

Citation
Sergey Mitryukovskiy, Yi Liu, Pengji Ding, Aurélien Houard, and André Mysyrowicz, "Backward stimulated radiation from filaments in nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses," Opt. Express 22, 12750-12759 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-11-12750


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