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Two-dimensional surface profile imaging technique based on a double-grating frequency shifter.

Kaiwei Wang1, Lijiang Zeng

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China. wkw01@mails.tsinghua.edu.cn

Applied Optics
|August 4, 2005
PubMed
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A novel surface imaging technique uses a low-coherence heterodyne interferometer to accurately measure surface profiles. This method achieves high precision for detailed surface topography analysis, even on reflective materials.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Surface Science

Background:

  • Accurate surface profile measurement is crucial for material characterization and quality control.
  • Existing techniques may face limitations with low-reflectivity surfaces or require complex setups.
  • Low-coherence interferometry offers potential for high-resolution, non-contact surface profiling.

Purpose of the Study:

  • To propose and demonstrate a two-dimensional surface profile imaging technique using a low-coherence heterodyne interferometer.
  • To address challenges in measuring surface profiles of materials with low effective reflectivity.
  • To achieve precise displacement measurements for detailed surface topography.

Main Methods:

  • Development of a tandem interferometer incorporating a double-grating frequency shifter for achromatic frequency shift of low-coherence light.

Related Experiment Videos

  • Implementation of a chopper and processing circuit to modulate interference fringes.
  • Acquisition of surface profiles using a CCD camera and a five-step phase-shifting method.

    • Main Results:

    • The proposed technique successfully acquired the surface profile of a glass sample with low effective reflectivity.
    • Achieved an uncertainty of 0.34 micrometers in displacement measurement over a 43 micrometer range.
    • Demonstrated the feasibility of two-dimensional surface profile imaging with the developed system.

    Conclusions:

    • The low-coherence heterodyne interferometer provides an effective method for two-dimensional surface profile imaging.
    • The system is capable of measuring surfaces with low effective reflectivity, expanding the applicability of interferometric techniques.
    • The achieved measurement uncertainty highlights the potential of this technique for high-precision metrology.