Backward lasing of singly ionized nitrogen ions pumped by femtosecond laser pulses

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We report on the observation of backward lasing at 391.4 nm of nitrogen ions pumped by linearly polarized intense femtosecond pulses at 800 nm. The strongly enhanced spectral intensity at 391.4 nm, as well as the amplification of an externally injected backward seeding pulse, confirm that the backward 391.4 nm signal is due to optical amplification in the nitrogen gas plasma. Compared to the forward emission at 391.4 nm, the optimal backward emission is achieved at a lower gas pressure around 10 mbar, which is due to asymmetry of the backward and forward directions rooted in the traveling excitation geometry. Comparison of the signals in pure nitrogen and air revealed a strong quenching effect of the oxygen molecules, preventing backward lasing action in ambient air.


  • Xiang Zhang
  • Rostyslav Danylo
  • Zhengquan Fan
  • Pengji Ding
  • Chenhao Kou
  • Qingqing Liang
  • Aurélien Houard
  • Vladimir Tikhonchuk
  • André Mysyrowicz
  • Yi Liu
Enheter & grupper
Externa organisationer
  • University of Shanghai for Science and Technology
  • École Polytechnique
  • University of Bordeaux
  • Academy of Sciences of the Czech Republic
  • Centre National de la Recherche Scientifique (CNRS)

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
TidskriftApplied Physics B: Lasers and Optics
Utgåva nummer3
StatusPublished - 2020 mar 2
Peer review utfördJa