Lasing dynamics of neutral nitrogen molecules in femtosecond filaments

Pengji Ding, Eduardo Oliva, Aurélien Houard, André Mysyrowicz, and Yi Liu
Phys. Rev. A 94, 043824 – Published 17 October 2016

Abstract

We investigate the dynamics of cavity-free lasing from neutral nitrogen molecules in femtosecond laser filaments. An important difference of intensity and temporal duration is observed between backward and forward lasing, in both amplified spontaneous emission and seed-amplification regimes. Numerical simulations based on a nonadiabatic Maxwell-Bloch model reproduce well the observations, and attribute these differences to the finite gain lifetime and the traveling excitation nature of this gas laser.

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  • Received 26 February 2016

DOI:https://doi.org/10.1103/PhysRevA.94.043824

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Pengji Ding1,2, Eduardo Oliva3, Aurélien Houard1, André Mysyrowicz1, and Yi Liu1,4,*

  • 1Laboratoire d'Optique Appliquée, ENSTA ParisTech, CNRS, Ecole Polytechnique, Université Paris-Saclay, 828 Boulevard des Maréchaux, 91762 Palaiseau cedex, France
  • 2School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 3Instituto de Fusión Nuclear, Universidad Politécnica de Madrid, Madrid 28006, Spain
  • 4Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, 516, Jungong Road, Shanghai 200093, China

  • *yi.liu@ensta-paristech.fr

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Vol. 94, Iss. 4 — October 2016

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