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Surface profilometry with laser-diode optical feedback interferometer outside optical benches.

J Liu1, I Yamaguchi

  • 1Optical Engineering Laboratory, The Institute of Physical and Chemical Research, Wako-shi, Saitama 351-0198, Japan. liu@optsun.riken.go.jp

Applied Optics
|March 14, 2008
PubMed
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This study introduces a simple interferometer using laser diode optical feedback for robust spherical mirror surface testing. The system achieves stable fringe locking, enabling accurate measurements even in non-ideal environments.

Area of Science:

  • Optical Engineering
  • Metrology
  • Surface Testing

Background:

  • Interferometry is crucial for precise surface testing.
  • Laser diodes offer compact and tunable light sources.
  • Optical feedback can stabilize laser performance.

Purpose of the Study:

  • To present a simple and robust interferometer for spherical mirror surface testing.
  • To demonstrate fringe phase locking using optical feedback from a laser diode.
  • To enable high-speed analysis of surface topography.

Main Methods:

  • Utilized a laser diode interferometer with optical feedback.
  • Implemented a fringe locking mechanism based on wavelength tuning.
  • Employed a fringe analyzer for real-time data processing.

Related Experiment Videos

Main Results:

  • Achieved fringe phase locking within 0.2pi (peak-to-valley).
  • Demonstrated stable operation on a standard wooden table.
  • Obtained measurement results comparable to traditional optical bench setups.

Conclusions:

  • Optical feedback provides a simple and effective method for stabilizing laser diode interferometers.
  • The developed system is suitable for accurate surface testing of spherical mirrors in various conditions.
  • This technique allows for video-rate analysis, enhancing measurement efficiency.