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Fringe counting method for synthetic phase with frequency-modulated laser diodes.

Ribun Onodera1, Munechika Sakuyama, Yukihiro Ishii

  • 1Department of Electronics, University of Industrial Technology, 4-1-1 Hashimotodai, Sagamihara, Kanagawa 229-1196, Japan. onodera@uitec.ac.jp

The Review of Scientific Instruments
|October 2, 2007
PubMed
Summary

A new fringe counting method uses two laser diodes (LDs) and an interferometer to measure displacement. This technique enables faster mirror movement detection by creating a synthetic fringe signal.

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Area of Science:

  • Optics and Photonics
  • Metrology

Background:

  • Displacement measurement is crucial in various scientific and industrial applications.
  • Traditional fringe counting methods can be limited by speed and sensitivity.

Purpose of the Study:

  • To develop an advanced fringe counting method for enhanced displacement measurement.
  • To improve the speed and accuracy of measuring mirror movement.

Main Methods:

  • Constructed a fringe counting system utilizing two frequency-modulated laser diodes (LDs).
  • Employed an unbalanced two-beam interferometer with mutually inverted sawtooth current modulation.
  • Generated synthetic fringe signals by mixing interference patterns from two LDs.

Main Results:

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  • Achieved interference fringe signals with opposite signs for respective wavelengths.
  • Produced a synthetic fringe signal with reduced sensitivity to synthetic wavelength.
  • Enabled faster displacement measurement through synthetic fringe pulses.

    • Conclusions:

    • The developed laser diode fringe counting method enhances displacement measurement capabilities.
    • The system allows for faster detection of mirror movement compared to conventional techniques.
    • This method offers a promising approach for high-speed metrology applications.