Abstract
Recently, much attention has been focused on the development of experimental techniques for the visualization of spatial distributions of atoms and molecules in plasmas and flames1 and Velocity profiles in gas flows.2 In this paper, we discuss the possibilities of two nonlinear-optical techniques that use Raman resonances—coherent hyper-Raman four-wave mixing (FWM)3 and Raman excitation + laser-induced electronic fluorescence (RELIEF)4—for plasma imaging and flow tagging.
© 1998 Optical Society of America
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