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Closed-loop phase-shifting homodyne interferometry using heterodyne phase detection.

Youichi Bitou1

  • 1National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 3, Tsukuba, Ibaraki, Japan. y-bitou@aist.go.jp

Applied Optics
|November 22, 2008
PubMed
Summary

A novel homodyne interferometer uses heterodyne phase detection for precise feedback control. This system successfully stabilizes interference fringes and achieves accurate phase shifts despite micrometer-level vibrations.

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Area of Science:

  • Optical interferometry
  • Precision measurement systems

Background:

  • Homodyne interferometers are susceptible to environmental disturbances like vibrations.
  • Maintaining stable interference fringes and accurate phase shifts is crucial for high-precision measurements.

Purpose of the Study:

  • To develop a phase-shifting homodyne interferometer with enhanced stability and accuracy.
  • To implement a feedback control system using heterodyne phase detection.

Main Methods:

  • Utilized a backreflected beam from a reference flat with a wedge angle.
  • Integrated an internal heterodyne detection system to generate feedback error signals.
  • Employed a digital high-speed lock-in amplifier for signal processing.

Main Results:

  • Successfully demonstrated interference fringe stabilization in a homodyne interferometer.
  • Achieved accurate pi/2 phase shifts even under micrometer-order vibrations.
  • Validated the effectiveness of the heterodyne phase detection feedback control.

Conclusions:

  • The developed phase-shifting homodyne interferometer offers robust performance against vibrations.
  • The feedback control system significantly improves the stability and accuracy of homodyne interferometry.
  • This technique is applicable to general nonpolarizing homodyne interferometer configurations.