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Common-path achromatic interferometer-coronagraph: images from a breadboard demonstrator.

Alexander V Tavrov1, Jun Nishikawa, Motohide Tamura

  • 1National Astronomical Observatory of Japan, Tokyo, Japan. alxandtv@cc.nao.ac.jp

Applied Optics
|October 2, 2007
PubMed
Summary
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A novel three-dimensional interferometer achromatically cancels on-axis light while preserving off-axis detection. This common-path design offers high stability and achieved a 6x10(-6) nulling contrast in experiments.

Area of Science:

  • Optics and Photonics
  • Interferometry
  • Geometric Phase

Background:

  • Interferometers are crucial optical instruments.
  • Achieving achromatic phase shifts and stable common-path designs are significant challenges.

Purpose of the Study:

  • To propose and demonstrate a three-dimensional common-path interferometer.
  • To achieve achromatic nulling of on-axis sources while enabling off-axis source detection.

Main Methods:

  • Utilizing a three-dimensional common-path interferometer design.
  • Employing geometric phase to introduce an achromatic pi-phase shift.
  • Exploiting destructive interference for on-axis light nulling.

Main Results:

  • Demonstrated achromatic nulling of an on-axis source.

Related Experiment Videos

  • Maintained detectability of an off-axis source with equal intensity from both ports.
  • Achieved a high peak-to-peak nulling contrast of 6x10(-6).

    • Conclusions:

    • The proposed interferometer effectively nulls on-axis light achromatically.
    • The common-path configuration ensures robustness against environmental disturbances.
    • This technology has potential applications in optical sensing and metrology.