This study investigates structured light beams and wavelength modulation spectroscopy for advanced plasma diagnostics. Structured light, with its spatial and spatiotemporal structures, enables enhanced signal-to-noise ratios and high-resolution measurements of plasma velocity distribution functions, especially in devices with limited access. The research introduces a confocal Laser-Induced Fluorescence setup using a Laguerre-Gaussian annular laser beam, achieving a spatial resolution of approximately 5 mm at a 300 mm focal distance, with potential to reach up to 1 mm. This advancement could broaden the scope of applications to other diagnostic methods in industrial plasma sources and electric propulsion systems. Additionally, WM spectroscopy, effective in complex plasma environments, measures spectral line profile derivatives, improving spectral resolution and reducing background noise. Findings from confocal measurements with structured light and WM-LIF in an industrial plasma device show that these techniques can provide insights into plasma dynamics not accessible through conventional diagnostics, indicating significant potential for plasma diagnostics applications.
We report on the development and application of coherent Rayleigh-Brillouin scattering for the in situ detection of large molecules and nanoparticles. This four wave mixing diagnostic technique relies on the creation of an electrostrictive optical lattice in a medium due to the interaction between polarized particles and the intense electric field gradient created by the optical interference of two intense pulsed laser beams. Though this interaction, we can detect the temperature, pressure, relative density, polarizability and speed of sound of a gas and gas mixture. This diagnostic was already successfully demonstrated in atomic and molecular gaseous environments, where the different gas polarizabilities and pressures were successfully measured. We are currently conducting in situ measurements with large molecules and nanoparticles produced in an arc discharge, the results of which will be presented in this meeting.
We report on the development and application of a new laser diagnostic for the in situ detection of large molecules and nanoparticles. This four wave mixing diagnostic technique relies on the creation of an optical lattice in a medium due to the interaction between polarized particles and intense laser fields. Though this interaction, we can detect the temperature, pressure, relative density, polarizability and speed of sound of a gas and gas mixture. This diagnostic was already successfully demonstrated in atomic and molecular gaseous environments, where the different gas polarizabilities and pressures were successfully measured. We are currently conducting measurements with large molecules and nanoparticles, the results of which will be presented in this meeting.
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