Abstract

Semiconductor laser diagnostics based on laser-induced fluorescence and absorption have been developed to probe the 4s³P₁ → 4p³D₁ transition (8104 Å) of argon in an atmospheric-pressure plasma produced by an inductively coupled plasma torch. Spatially resolved measurements of electron number density, atomic kinetic temperature, and electron temperature have been inferred from a line-profile analysis of Stark-affected absorption spectra. State parameters determined from simultaneous fluorescence and absorption line-shape and line-shift measurements are mutually consistent and show good agreement in the analytical region of the plasma. The results represent what are to our knowledge the first spectrally resolved fluorescence measurements of argon in an atmospheric-pressure plasma.

© 1992 Optical Society of America

Semiconductor laser-based measurements of quench rates in an atmospheric pressure plasma by using saturated-fluorescence spectroscopy

D. S. Baer and R. K. Hanson
Appl. Opt. 32(6) 948-955 (1993)

Time-resolved diagnostic measurements of sub-atmospheric laser-induced air plasmas using the O_I 777 nm emission

Ashwin P. Rao, Noshin Nawar, and Christopher J. Annesley
Opt. Continuum 3(2) 187-199 (2024)

Spectroscopy and kinetics of ionic alkali halide excimers excited by a laser-produced plasma

S. Kubodera, P. J. Wisoff, and R. Sauerbrey
J. Opt. Soc. Am. B 9(1) 10-21 (1992)

Measurement of electron density and temperature from laser-induced nitrogen plasma at elevated pressure (1–6 bar)

Ashwin P. Rao, Mark Gragston, Anil K. Patnaik, Paul S. Hsu, and Michael B. Shattan
Opt. Express 27(23) 33779-33788 (2019)

Spectroscopic investigation of laser-initiated low-pressure plasmas in atmospheric gases

R. A. Armstrong, R. A. Lucht, and W. T. Rawlins
Appl. Opt. 22(10) 1573-1577 (1983)