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Three-dimensional flow velocity determination using laser-induced fluorescence method with asymmetric optical vortex

Kenichiro Terasaka1,2, Shinji Yoshimura3,4, Hiroki Minagawa5

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A novel asymmetric optical vortex beam laser-induced fluorescence (aOVLIF) method measures plasma flow velocity. This technique uses spectral shifts to determine ion flow and temperature, enhancing plasma diagnostics.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Optical Physics

Background:

  • Laser-induced fluorescence (LIF) is a standard diagnostic for plasma properties.
  • Conventional LIF often uses plane waves, limiting its ability to probe complex flow dynamics.
  • Measuring 3D plasma velocity vectors requires advanced spectroscopic techniques.

Purpose of the Study:

  • To introduce and validate a new LIF method using asymmetric optical vortex beams (aOVLIF) for plasma flow velocity measurement.
  • To investigate the feasibility of using aOVLIF for simultaneous temperature determination.
  • To analyze the impact of beam propagation on measurement sensitivity.

Main Methods:

  • Numerical calculation of LIF spectra using asymmetric optical vortex beams.
  • Simulation of low-temperature plasma parameters to model spectral responses.
  • Analysis of spectral frequency shifts caused by ion flow across the beam.

Main Results:

  • Ion flow across the beam induces a measurable frequency shift in LIF spectra.
  • The aOVLIF method demonstrates capability for plasma temperature measurements.
  • Propagation effects of asymmetric optical vortex beams minimally affect transverse flow velocity sensitivity.

Conclusions:

  • The asymmetric optical vortex beam laser-induced fluorescence (aOVLIF) method is a viable technique for plasma flow velocity measurement.
  • aOVLIF leverages the phase structure of optical vortices for enhanced diagnostic capabilities.
  • This method offers potential for determining 3D velocity vectors, improving upon conventional LIF.