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Population inversion of molecular nitrogen in an Ar: N mixture by selective resonance-enhanced multiphoton ionization

Journal of Applied Physics, ISSN: 0021-8979, Vol: 110, Issue: 8
2011
  • 45
    Citations
  • 0
    Usage
  • 23
    Captures
  • 0
    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    45
    • Citation Indexes
      45
  • Captures
    23

Article Description

Resonance-enhanced multiphoton ionization (REMPI) is shown to offer an attractive strategy for population inversion of molecular nitrogen in an Ar: N gas mixture. We present a detailed analysis of the key processes leading to a population inversion of molecular nitrogen in a REMPI-pumped Ar: N gas mixture, including a (3 + 1) REMPI of argon atoms, conversion of the REMPI-generated atomic argon ions into molecular ions, and generation of long-lived metastable excited-state argon atoms through dissociative recombination, populating the Cπ states of molecular nitrogen. Population inversion achieved for the second-positive-band laser transitions of molecular nitrogen enables stimulated emission of ultraviolet radiation at 337 nm. A high selectivity of the REMPI process helps to radically reduce the depletion of the working medium through the ionization of N , providing a pump mechanism that is ideally suited for the creation of a new type of a highly efficient nitrogen laser. © 2011 American Institute of Physics.

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