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A retroreflector array shows diffraction effects in fusion plasma experiments, creating beam peaks. However, most power reflects directly, and a lens can suppress intensity variations for interferometer applications.

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Area of Science:

  • Optics and Photonics
  • Plasma Physics
  • Interferometry

Background:

  • Retroreflector arrays offer unique optical properties for spatially constrained environments.
  • Michelson-type interferometers are crucial for plasma diagnostics.

Purpose of the Study:

  • To experimentally investigate the optical properties of a retroreflector array.
  • To assess its suitability for Michelson interferometry in fusion plasma experiments.

Main Methods:

  • A tabletop experiment using a 320-GHz submillimeter wave source and a retroreflector array.
  • An imaging camera measured submillimeter wave beam profiles.
  • Characterization of reflected beam properties and angular dependence.

Main Results:

  • Observed diffraction effects leading to discrete peaks in the reflected beam profile.
  • Confirmed that the majority of reflected power converges in the incident direction.
  • Identified intensity variations due to diffraction, dependent on incident beam angle.

Conclusions:

  • Retroreflector arrays exhibit predictable diffraction patterns and strong retroreflection.
  • A focusing lens can mitigate intensity fluctuations for practical interferometer use.
  • The study validates retroreflector arrays as viable tools for limited-space plasma diagnostics.