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Chromatically dispersed interferometry with wavelet analysis.

Evangelos Papastathopoulos1, Klaus Körner, Wolfgang Osten

  • 1Institut für Technische Optik, Universität Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany. papastav@ito-uni-stuttgart.de

Optics Letters
|March 31, 2006
PubMed
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A novel white-light interferometry sensor achieves microscopic height detection without mechanical scanning. It overcomes dynamic range limitations using a dispersed focusing technique for precise measurements.

Area of Science:

  • Optical Metrology
  • Interferometry
  • Microscopy

Background:

  • Traditional spectral interferometry suffers from limited dynamic range.
  • Mechanical axial scanning is often required for height measurements in interferometric systems.

Purpose of the Study:

  • To introduce a new white-light interferometry point sensor.
  • To enable microscopic height detection without mechanical axial scanning.
  • To overcome the dynamic range limitations of previous spectral interferometric schemes.

Main Methods:

  • Utilizing a chromatically dispersed depth detection field.
  • Monitoring interference in the optical frequency domain.
  • Forming a high-contrast interference window via dispersed focusing.

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Main Results:

  • Achieved microscopic height detection without mechanical axial scanning.
  • Solved the limited dynamic range problem of prior spectral interferometric methods.
  • Retrieved object position with 0.8 NA focus over a 30 micrometer axial range.

Conclusions:

  • The developed sensor offers a non-contact, high-dynamic-range solution for microscopic height measurements.
  • The technique of chromatically dispersed focusing is effective in enhancing interference contrast.
  • This method provides a promising approach for precise metrology applications.