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High-sensitive multi-pass imaging interferometry of a gas/plasma jet.

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This study enhances optical interferometry sensitivity for diagnosing low-refractivity gas/plasma jets. Multi-pass setups increase measurement sensitivity up to 8 times compared to single-pass methods.

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Area of Science:

  • Physics
  • Optical Engineering

Background:

  • Optical interferometry is crucial for diagnosing transparent media like gas/plasma jets.
  • Standard single-pass setups often lack the sensitivity required for weakly refractive materials.

Purpose of the Study:

  • To enhance the sensitivity of optical interferometry for diagnosing gas/plasma jet density.
  • To develop and evaluate multi-pass probing techniques for improved measurement accuracy.

Main Methods:

  • Modified Michelson interferometer designs were employed.
  • Multi-pass and multi-angle propagation of the probing beam through the inhomogeneity were utilized.
  • Comparison with standard single-pass Mach-Zehnder setups was performed.

Main Results:

  • Multi-pass interferometry setups demonstrated significantly increased sensitivity.
  • Sensitivity enhancement of up to 8 times was achieved compared to single-pass methods.
  • The technique proved effective for transparent, axially symmetrical gas/plasma jets.

Conclusions:

  • Multi-pass optical interferometry offers a substantial improvement in sensitivity for diagnosing weakly refractive gas/plasma jets.
  • This technique provides a viable solution for high-sensitivity measurements in transparent media.
  • The modified Michelson interferometer is a promising tool for advanced plasma diagnostics.