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Multiple-wavelength digital holographic interferometry using tunable laser diodes.

Atsushi Wada1, Makoto Kato, Yukihiro Ishii

  • 1Department of Applied Physics, Tokyo University of Science, Tokyo, Japan. wada@rs.kagu.tus.ac.jp

Applied Optics
|April 22, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces multi-wavelength digital holographic interferometry for wide-range measurements. The technique combines multiple contour maps for enhanced sensitivity and accuracy, validated against standard instruments.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Interferometry

Background:

  • Digital holographic interferometry (DHI) is a powerful technique for 3D surface measurement.
  • Traditional DHI methods can be limited in measurement range or sensitivity.
  • Achieving both wide measurement range and high sensitivity simultaneously is a significant challenge.

Purpose of the Study:

  • To develop a multi-wavelength digital holographic interferometry (MWDHI) system.
  • To achieve a wide measurement range and high sensitivity in object contour mapping.
  • To calibrate synthetic wavelengths using known height differences, reducing reliance on precise wavelength knowledge.

Main Methods:

  • Utilizing laser diodes with tunable wavelengths controlled by injection current.
  • Implementing multiple-wavelength digital holographic interferometry.
  • Combining multiple contour maps with varying sensitivities to create a composite measurement.
  • Calibrating synthetic wavelengths using a known height difference.

Main Results:

  • Demonstrated a contour map with a wide measurement range and high sensitivity.
  • Achieved synthetic wavelengths ranging from approximately 3 mm (high sensitivity) to 4 cm (wide range).
  • Reported an RMS error of approximately 35 µm for a 1 cm height measurement.
  • Validated the accuracy of MWDHI by comparing its results with a standard stylus instrument.

Conclusions:

  • The developed MWDHI technique effectively overcomes the limitations of traditional interferometry.
  • The system provides a flexible approach to contour mapping, balancing measurement range and sensitivity.
  • The calibration method using synthetic wavelengths enhances the practical applicability of the technique.