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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Suppressing phase errors from vibration in phase-shifting interferometry.

Leslie L Deck1

  • 1Zygo Corporation, Middlefield, Connecticut 06455, USA. LDeck@zygo.com

Applied Optics
|July 14, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a fast, general method to reduce vibration errors in phase-shifting interferometry. By analyzing phase-error patterns, it corrects surface maps, significantly improving accuracy for various interferometers.

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Area of Science:

  • Optical Metrology
  • Vibration Analysis

Background:

  • Phase-shifting interferometry (PSI) is sensitive to environmental vibrations.
  • Vibrations introduce phase errors, distorting surface measurements.
  • Existing methods for vibration reduction have limitations.

Purpose of the Study:

  • To develop a general and computationally efficient method for reducing vibration influence in PSI.
  • To correct surface phase maps affected by vibrations.

Main Methods:

  • A novel spectral analysis of the "phase-error pattern" (interference intensity vs. measured phase) is employed.
  • The method is applied to each phase-shifted image.
  • It is compatible with any PSI algorithm and interferometer geometry.

Main Results:

  • Achieved over a 100x reduction in vibrationally induced surface distortion on real data.
  • Demonstrated applicability to various surface shapes without requiring high-density carrier fringes.
  • The method is computationally fast.

Conclusions:

  • The proposed spectral analysis method effectively corrects vibration-induced errors in PSI.
  • It offers a versatile and efficient solution for accurate surface metrology in the presence of vibrations.