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Double-grating interferometer with a one-to-one correspondence with a Michelson interferometer.

Yande Xu1, Osami Sasaki, Takamasa Suzuki

  • 1Faculty of Engineering, Niigata University, 8050 Ikarashi 2, Niigata 950-2181, Japan. xuyande@teoptlab.eng.niigata-u.ac.jp

Optics Letters
|September 30, 2003
PubMed
Summary

A novel double-grating interferometer offers precise surface profile measurements. This instrument provides a larger measuring range and easily adjustable fringe widths compared to traditional Michelson interferometers.

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Area of Science:

  • Optics and Photonics
  • Interferometry
  • Metrology

Background:

  • Michelson interferometers are standard tools for optical measurements.
  • Existing interferometers face limitations in measuring range and fringe control.

Purpose of the Study:

  • To introduce a double-grating interferometer with enhanced capabilities.
  • To demonstrate its advantages over the Michelson interferometer for surface profiling.

Main Methods:

  • A double-grating interferometer design was developed.
  • The relationship between grating spatial periods and wavelengths was established.
  • Interference fringe characteristics and intensity distribution were analyzed.

Main Results:

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  • The double-grating interferometer shows a one-to-one correspondence with the Michelson interferometer.
  • Fringe widths are easily adjustable, and intensity distribution is wavelength-independent.
  • Precise coincidence of interference beams allows for accurate surface profile measurement.
  • The measuring range significantly exceeds that of a Michelson interferometer.

    • Conclusions:

    • The double-grating interferometer is a powerful tool for high-precision surface metrology.
    • Its design offers superior flexibility and a broader measuring range.
    • This technology advances optical measurement techniques.