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Related Experiment Videos

Phase-shift-locked interferometer with a wavelength-modulated laser diode.

Ribun Onodera1, Yukihiro Ishii

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

Applied Optics
|January 10, 2003
PubMed
Summary
This summary is machine-generated.

A novel phase-shift-locked interferometer precisely measures distances using laser diode modulation and electrical feedback. This system allows for real-time optical path difference determination with high sensitivity.

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Area of Science:

  • Optical physics
  • Metrology
  • Laser instrumentation

Background:

  • Interferometry is crucial for precise distance measurement.
  • Existing methods may face limitations in real-time accuracy and sensitivity.
  • Laser diode modulation offers potential for advanced interferometric techniques.

Purpose of the Study:

  • To construct and evaluate a phase-shift-locked interferometer for accurate distance measurement.
  • To investigate the real-time measurement capabilities of the developed system.
  • To analyze the sensitivity of the phase-shift-locked interferometer.

Main Methods:

  • Construction of a phase-shift-locked interferometer utilizing a laser diode.
  • Employing sawtooth-current modulation of the laser diode.
  • Implementing an electrical feedback technique to lock phase shifts to a preset polarization-determined phase difference using a quarter-wave plate and polarizers.
  • Real-time measurement of optical path difference based on locked sawtooth-wave current amplitude.

Main Results:

  • Successful construction of a functional phase-shift-locked interferometer.
  • Demonstration of real-time optical path difference measurement.
  • Acquisition of data on the interferometer's sensitivity.

Conclusions:

  • The developed phase-shift-locked interferometer is effective for distance measurement.
  • The system enables real-time optical path difference determination.
  • Further discussion on the interferometer's sensitivity is provided.