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Updated: Jan 31, 2026

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Talbot interferometry for imaging two-dimensional electron density distribution over discharge plasma with higher

Y Inada1, T Kamiya1, H Nagai1

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This study enhances laser wavefront sensors for electron density imaging in plasmas using Talbot interferometers with pinhole arrays. The new system offers a 4x improvement in measurement sensitivity compared to previous methods.

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Area of Science:

  • Plasma physics
  • Optical interferometry
  • Laser diagnostics

Background:

  • Electron density imaging is crucial for understanding discharge plasmas.
  • Existing laser wavefront sensors, like Shack-Hartmann, have limitations in measurement sensitivity.
  • Talbot interferometers offer potential for enhanced sensitivity in plasma diagnostics.

Purpose of the Study:

  • To investigate Talbot interferometers with pinhole arrays for improved electron density imaging in discharge plasmas.
  • To enhance the measurement sensitivity of laser wavefront sensors.
  • To compare the performance of the new system with Shack-Hartmann sensors.

Main Methods:

  • Experimental and numerical investigation of Talbot interferometers with pinhole arrays.
  • Numerical simulation using plane wave decomposition method.
  • Fabrication and testing of pinhole arrays with specific dimensions (300 μm pitch, 150 μm diameter).

Main Results:

  • Pinhole arrays with 300 μm pitch and 150 μm diameter were found optimal for millimetre-scale plasmas.
  • A 4x improvement in measurement sensitivity was predicted and experimentally verified.
  • Successful electron density imaging of vacuum arcs was achieved, showing agreement with Shack-Hartmann sensors.

Conclusions:

  • Talbot interferometers with optimized pinhole arrays significantly improve measurement sensitivity for electron density imaging.
  • The developed system is suitable for diagnosing millimetre-scale discharge plasmas.
  • Practical considerations for pinhole array fabrication were addressed.