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Related Experiment Video

Updated: May 8, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

Polarizer design for millimeter-wave plasma diagnostics.

F Leipold1, M Salewski, A S Jacobsen

  • 1Department of Physics, Technical University of Denmark, DK-4000 Roskilde, Denmark.

The Review of Scientific Instruments
|September 7, 2013
PubMed
Summary

Researchers explored birefringent windows as a cost-effective alternative to grooved mirrors for converting elliptical to linear polarization in magnetized plasma diagnostics. This innovation could lead to more compact and affordable microwave receivers.

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Area of Science:

  • Plasma Physics
  • Optical Engineering

Background:

  • Magnetized plasmas emit elliptically polarized radiation.
  • Grooved mirrors are currently used to convert this to linear polarization in collective Thomson scattering diagnostics.
  • This conversion method presents limitations in terms of size and cost for microwave receivers.

Purpose of the Study:

  • To investigate the feasibility of using birefringent windows as a substitute for grooved mirrors.
  • To evaluate the potential for developing more compact and cost-effective microwave receivers.

Main Methods:

  • Analysis of birefringent properties of sapphire (a-cut) and high-density polyethylene windows.
  • Calculation of wave energy transmission for these materials.

Main Results:

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Last Updated: May 8, 2026

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  • Sapphire (a-cut) windows can achieve over 99% wave energy transmission.
  • High-density polyethylene windows can achieve over 97% wave energy transmission.
  • Both materials show promise for polarization conversion.

Conclusions:

  • Birefringent windows offer a viable and potentially more economical alternative to grooved mirrors.
  • This substitution can enable the design of more compact and lower-cost microwave receivers for plasma diagnostics.