Measurements of the indium hyperfine structure in an atmospheric-pressure flame by use of diode-laser-induced fluorescence

J. Hult, I.S. Burns, C.F. Kaminski

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We report on what we believe is the first demonstration of laser-induced fluorescence (LIF) in flames by use of diode lasers. Indium atoms seeded into an atmospheric-pressure flame at trace concentrations are excited by a blue GaN laser operating near 410 nm. The laser is mounted in an external-cavity configuration, and the hyperfine spectrum of the 5(2)P(1/2) → 6(2)S(1/2) transition is captured at high resolution in single-wavelength sweeps lasting less than one tenth of a second. The research demonstrates the potential of diode-based LIF for practical diagnostics of high-temperature reactive flows.
Original languageEnglish
Pages (from-to)827-829
Number of pages3
JournalOptics Letters
Issue number8
Publication statusPublished - 15 Apr 2004


  • indium hyperfine
  • atmospheric-pressure
  • diode-laser-induced
  • fluorescence

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