1D profile diagnostics of neutral species with singleshot coherent Rayleigh-Brillouin scattering.

Temperature and density gradients of neutral species are important quantities to be experimentally estimated in low temperature plasmas, allowing for the validation of developed simulation codes and the better understanding of plasma processes. It is of importance that these diagnostics are performed non-perturbatively, fast, and simultaneously across the length of the plasma. Single shot coherent Rayleigh-Brillouin scattering (CRBS), a non-linear, non-resonant four-wave mixing laser diagnostic technique, has been demonstrated recently as an effective, non-perturbative, single laser shot diagnostic technique for nanoparticles produced in an arc discharge and for the temperature and density measurement of neutral species in glow discharges, among other studies. As is the case with four-wave mixing techniques, the current state-of-the-art CRBS implementations only allow for point measurements in the medium of interest, where the spatial resolution is dictated by the implemented laser beam geometry. Here, we report on the progress toward the implementation of a novel 1D single shot CRBS scheme, which will enable the simultaneous, single shot measurement (~150 ns) of quantities of interest across line profiles of extended dimensions in a variety of low temperature plasmas.