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Related Experiment Videos

Heterodyne interferometer with subatomic periodic nonlinearity.

C M Wu1, J Lawall, R D Deslattes

  • 1Physics Laboratory, National Institute of Standards and Technology, Building 221, Room A141, Gaithersburg, Maryland 20899, USA.

Applied Optics
|March 8, 2008
PubMed
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A novel heterodyne interferometer eliminates periodic nonlinearity for precise differential displacement measurements. This new design achieves sub-20 picometer nonlinearity, overcoming limitations of traditional methods.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Precision Engineering

Background:

  • Traditional heterodyne interferometers often suffer from periodic nonlinearity, limiting measurement accuracy.
  • Zeeman split lasers are a common source of this nonlinearity in conventional designs.

Purpose of the Study:

  • To present a new heterodyne interferometer design for differential displacement measurements.
  • To overcome the inherent periodic nonlinearity found in traditional interferometers.
  • To achieve theoretically perfect immunity from common-mode displacement.

Main Methods:

  • Utilized two acousto-optic modulators to generate spatially separated light beams with different frequencies.
  • Employed laser beams of the same frequency in both the measurement and reference arms.

Related Experiment Videos

  • Experimentally validated the performance and residual nonlinearity of the developed interferometer.

    • Main Results:

    • Demonstrated a novel heterodyne interferometer design that is, in principle, free of periodic nonlinearity.
    • Achieved a residual level of periodic nonlinearity less than 20 picometers in amplitude.
    • Identified unbalanced ghost reflections as the cause of the remaining, slowly drifting periodic error.

    Conclusions:

    • The proposed heterodyne interferometer design effectively minimizes periodic nonlinearity for differential displacement measurements.
    • The use of acousto-optic modulators and identical frequency beams in arms significantly reduces systematic errors.
    • Further improvements can be made by addressing unbalanced ghost reflections for even higher precision.