1D diagnostics of neutral particles in low temperature plasmas with single shot coherent Rayleigh-Brillouin scattering*

Single shot coherent Rayleigh-Brillouin scattering (CRBS), a non-linear, four-wave mixing laser diagnostic technique, is applied for the measurement of the translational temperature and density of neutral species in a low pressure xenon DC glow discharge. The single shot CRBS configuration scans the entire velocity distribution function of the neutral species in the medium within the duration of a single laser shot (approximately 150 ns). CRBS spectra of neutral species are obtained at different points radially across the xenon glow discharge, mapping horizontal temperature and density profiles, simultaneously. Experimentally obtained spectral lineshapes show good agreement when compared to simulated ones.The CRBS measurements within a glow discharge presented here can lead to diagnostics of neutral species in similar environments such as arc discharges, flames, plasma torches, etc. Additionally, we discuss the progress toward the implementation of a novel 1D single shot CRBS scheme, which will allow for the simultaneous, single shot measurement of quantities of interest across line profiles of extended dimensions in a variety of low temperature plasmas.