J. Amorim et al., Laser-induced resonance fluorescence as a diagnostic technique in non-thermal equilibrium plasmas, J PHYS D, 33(9), 2000, pp. R51-R65
Laser-induced fluorescence (LIF) techniques currently used as an optical di
agnostic to study and characterize non-thermal equilibrium plasmas are revi
ewed. The general mechanisms occurring in one- or two-photon resonant absor
ption-induced fluorescence when used for the detection of species in their
fundamental state are analysed. We emphasize the techniques based on the si
multaneous absorption of two photons for the detection of light atoms and m
olecules and, particularly, two-photon absorption laser-induced fluorescenc
e (TALIF) and derivative techniques, such as resonant enhanced multi-photo-
ionization, two-photon absorption laser-induced stimulated emission (TALISE
) and photo-fragment translational spectroscopy, in which molecules are pho
to-dissociated and the ejected atomic fragments are simultaneously detected
by TALIF The kinetics of one- and two-photon absorption are treated in det
ail including, for the latter, a modelling, which indicates the conditions
of emergence of TALISE. The main calibration methods allowing one to obtain
the absolute density of species detected by LIF and some examples of appli
cations demonstrating the interest of these diagnostic techniques in plasma
processing are presented.