Four-wave mixing diagnostics for neutrals, ions and electrons in low (and high) temperature plasmas

ORAL

Abstract

Single shot, non-resonant, laser-based four-wave mixing (FWM) diagnostics provide a novel way to characterize the thermodynamic state (T, N, v) of neutral gas and plasma flows with high spatio-temporal resolution and signal-to-noise-ratio (SNR) due to their coherent nature. We present progress in using intense optical lattices for radial and axial measurement of the thermodynamic state of neutrals in a glow discharge through single shot Rayleigh-Brillouin scattering (CRBS)[1], [2], prior to its use in arc discharges. Additionally, we demonstrate a similar FWM chirping concept for a novel coherent Thomson scattering scheme [3]. We also discuss single shot CRBS for ultrafast ionization and thermalization in nanosecond repetitively pulsed discharges (NRPs), driving Langmuir waves in a plasma, and performing coherent diagnostics to reveal electronic temperature and density [4]. Finally, we demonstrate the utilization of single shot CRBS for the fundamental and detailed understanding of nanoparticle synthesis by plasma.

[1] A. Gerakis, M. N. Shneider, and P. F. Barker. "Single-shot coherent Rayleigh–Brillouin scattering using a chirped optical lattice." Optics letters 38, no. 21 (2013): 4449-4452.

[2] R. Randoph, S. Suzuki, K. Hara, and A. Gerakis, "Simultaneous neutral density and temperature measurements of neutral species in plasma with single-shot coherent Rayleigh-Brillouin scattering", Manuscript submitted

[3] Mokrov, M., M. N. Shneider, and A. Gerakis. "Analysis of coherent Thomson scattering from a low temperature plasma." Physics of Plasmas 29, no. 3 (2022).

[4] Alfaro, G. F., N. Shneider, and A. Gerakis. "Analysis of an induced Langmuir wave by ponderomotive forces and its applicability for plasma diagnostics", Manuscript submitted

*G.F.A is supported by the Luxembourg National Research Fund 15480342 (FRAGOLA). A.G. is supported by the Luxembourg National Research Fund 15480342 (FRAGOLA) and 1783565 (ULTRAION). M.N.S. acknowledges partial support by the Princeton Collaborative Research Facility (PCRF) supported by the U.S. DOE under contract No. DE-AC02-09CH11466. M.S.S. and P.J.B. acknowledge support by the National Science Foundation (PHY 2308946).

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Publication: [2] R. Randoph, S. Suzuki, K. Hara, and A. Gerakis, "Simultaneous neutral density and temperature measurements of neutral species in plasma with single-shot coherent Rayleigh-Brillouin scattering", Manuscript to be submitted
[4] Alfaro, G. F., N. Shneider, and A. Gerakis. "Analysis of an induced Langmuir wave by ponderomotive forces and its applicability for plasma diagnostics", Manuscript submitted

Presenters

  • Alexandros Gerakis

    • Luxembourg Institute of Science & Technology

Authors

  • Gabriel Flores Alfaro

    • Luxembourg Institute of Science & Technology

  • Robert Randolph

    • Texas A&M University

  • Shigemitsu Suzuki

    • Stanford University

  • Marios Kounalakis

    • Luxembourg Institute of Science & Technology

  • Stefan Karatodorov

    • Luxembourg Institute of Science & Technology

  • David Pai

    • LPP CNRS Ecole Polytechnique

  • Marien Simeni Simeni

    • University of Minnesota

  • Peter Bruggeman

    • University of Minnesota

  • Mikhail N Shneider

    • Princeton University

  • Ken Hara

    • Stanford University

  • Alexandros Gerakis

    • Luxembourg Institute of Science & Technology