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Related Experiment Videos

Optimized reflective wide-angle Michelson phase-stepping interferometer.

S Wang1, G G Shepherd, W E Ward

  • 1Centre for Research in Earth and Space Science, York University, North York, Ontario, M3J 3K1, Canada. Wang@calcorp.com

Applied Optics
|March 21, 2008
PubMed
Summary
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A novel ultraviolet interferometer using cat's-eye retroreflectors enables optical Doppler imaging. This compact instrument offers a broad viewing geometry, ideal for space missions by eliminating the need for background control systems.

Area of Science:

  • Optical Physics
  • Astronomy Instrumentation
  • Spectroscopy

Background:

  • Solar flux is weaker in the ultraviolet (UV) spectrum compared to visible light.
  • Traditional spacecraft optical instruments require solar background control systems.
  • Developing compact, wide-field instruments for UV observations is challenging.

Purpose of the Study:

  • To develop a fully achromatic wide-angle interferometer for optical Doppler imaging in the UV region.
  • To design an instrument that eliminates the need for solar background control, enabling smaller size and broader viewing geometry.
  • To present the theory and test results of this novel interferometer.

Main Methods:

  • Utilized cat's-eye retroreflectors for the interferometer design.

Related Experiment Videos

  • Minimized aberrations inherent in cat's-eye geometry to optimize the design.
  • Conducted experimental tests in visible and near-UV regions to validate performance.

    • Main Results:

    • Achieved a fully achromatic wide-angle interferometer suitable for UV optical Doppler imaging.
    • The instrument is significantly smaller and offers a broader viewing geometry due to the absence of a background control system.
    • Experimental tests confirmed a 5-degree field of view with residual wave distortions of approximately 1/8 wave.

    Conclusions:

    • The developed interferometer is effective for high-resolution Doppler imaging in the UV.
    • The cat's-eye retroreflector design minimizes aberrations and enhances performance.
    • This instrument represents a significant advancement for UV space-based optical observations.