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Fiber-diffraction interferometer for vibration desensitization.

Hagyong Kihm1, Seung-Woo Kim

  • 1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Science Town, Daejeon 305-701, South Korea.

Optics Letters
|September 1, 2005
PubMed
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A novel interferometer uses fiber diffraction and a spatial phase shifter for high vibration immunity. This design achieves stable measurements with sub-nanometer fringe stabilization in standard workshop settings.

Area of Science:

  • Optical Engineering
  • Metrology

Background:

  • Vibration is a significant challenge in interferometric measurements, degrading accuracy.
  • Traditional interferometers often require extensive vibration isolation, limiting their practical application.

Purpose of the Study:

  • To develop a new interferometer with inherent high immunity to environmental vibrations.
  • To enable stable, high-precision measurements in non-ideal laboratory or workshop environments.

Main Methods:

  • A common-path design using fiber diffraction to generate the reference wave.
  • Integration of a spatial phase shifter for simultaneous acquisition of four phase-shifted interferograms.
  • Simultaneous data capture to eliminate time-delay errors.

Main Results:

Related Experiment Videos

  • The proposed interferometer demonstrated exceptional vibration desensitization.
  • Achieved fringe stabilization below 1 nanometer.
  • Successful operation in a typical workshop environment without specialized vibration isolation.

Conclusions:

  • The novel interferometer design offers a robust solution for high-precision measurements in vibration-prone settings.
  • Common-path design and simultaneous phase shifting are key to achieving vibration immunity.
  • This technology has the potential to broaden the applicability of interferometry.