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Highest-accuracy interferometer alignment by retroreflection scanning.

René Schödel1, Gerhard Bönsch

  • 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany. rene.schoedel@ptb.de

Applied Optics
|November 16, 2004
PubMed
Summary

Accurate interferometric length measurements require precise autocollimation alignment. A new scanning retroreflection method significantly reduces cosine error uncertainty in high-accuracy length measurements.

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Area of Science:

  • Metrology
  • Optical Engineering
  • Precision Measurement

Background:

  • Autocollimation adjustment is crucial for accurate interferometric length measurements.
  • Ensures parallelism between light waves and the object's length direction.
  • Conventional visual autocollimation has been used at Physikalisch-Technische Bundesanstalt.

Purpose of the Study:

  • To introduce a novel autocollimation method for interferometric length measurements.
  • To reduce the uncertainty contribution from cosine error.
  • To improve the quality of autocollimation adjustment.

Main Methods:

  • Description of the conventional visual autocollimation technique.
  • Development and application of a new scanning retroreflection autocollimation method.

Related Experiment Videos

  • Performance of check measurements to evaluate adjustment quality.

    • Main Results:

    • The new scanning retroreflection method was successfully implemented.
    • Check measurements confirmed the effectiveness of the new method.
    • Significant reduction in uncertainty contribution from cosine error was achieved.

    Conclusions:

    • The novel scanning retroreflection autocollimation method enhances accuracy in interferometric length measurements.
    • This method effectively minimizes cosine error, a key factor in measurement uncertainty.
    • The improved alignment technique offers a substantial advancement in precision metrology.