Enhancement of femtosecond laser-induced plasma fluorescence using a nanosecond laser

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Abstract

We demonstrate the enhancement of femtosecond (fs) laser-induced filaments in air and nitrogen flow fields using a nanosecond (ns) laser. With the ns laser being imposed on the filaments, the length and the emission intensity of the filaments were largely increased. Temporally resolved spectra of the enhanced filaments were obtained. The results show that the ns laser enhanced the short-lifetime fluorescence of nitrogen, which comes from the transition processes of N 2 + (B 2 Σ u + - X 2 Σ g + ), N 2 (B 3 Π g - A 3 Σ u + ) and N 2 (C 3 Π u - B 3 Π g ). However, it had little effect on the long-lifetime chemiluminescence, which mainly comes from reactions such as N 2 (A 3 Σ u + ) + N 2 (A 3 Σ u + ) → N 2 (X 1 Σ g + , v = 0) + N 2 (B 3 Π g ). A possible explanation of this phenomenon is given, and this phenomenon might have potential applications in instantaneous one-dimensional measurements of various species in gas flow fields.

Detaljer

Författare
  • Xiaofeng Li
  • Bo Li
  • Jixu Liu
  • Zhifeng Zhu
  • Dayuan Zhang
  • Yifu Tian
  • Qiang Gao
  • Zhongshan Li
Enheter & grupper
Externa organisationer
  • Tianjin University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
Originalspråkengelska
Sidor (från-till)5755-5763
Antal sidor9
TidskriftOptics Express
Volym27
Utgivningsnummer4
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa