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

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
  • Xiang Zhang
  • Rostyslav Danylo
  • Zhengquan Fan
  • Pengji Ding
  • Chenhao Kou
  • Qingqing Liang
  • Aurélien Houard
  • Vladimir Tikhonchuk
  • André Mysyrowicz
  • Yi Liu
Organisations
External organisations
  • University of Shanghai for Science and Technology
  • École Polytechnique
  • University of Bordeaux
  • Academy of Sciences of the Czech Republic
  • The French National Centre for Scientific Research (CNRS)
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Article number53
JournalApplied Physics B: Lasers and Optics
Volume126
Issue number3
Publication statusPublished - 2020 Mar 2
Publication categoryResearch
Peer-reviewedYes