Measurements of the indium hyperfine structure in an atmospheric-pressure flame by use of diode-laser-induced fluorescence.
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)P1/2 --> 6(2)S1/2 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.
Hult
Johan
J
Department of Chemical Engineering, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, UK. jfh36@cheng.cam.ac.uk
Burns
Iain Stewart
IS
Kaminski
Clemens Friedrich
CF