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Ultrastable absolute-phase common-path optical profiler based on computer-generated holography.

N B Sawyer, C W See, M Clark

    Applied Optics
    |February 28, 2008
    PubMed
    Summary
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    A novel scanning interferometric profiler utilizes a computer-generated hologram for stable, absolute-phase measurements. This exceptionally stable system enables simultaneous form and texture analysis, demonstrating practical applications.

    Area of Science:

    • Optical Engineering
    • Metrology
    • Interferometry

    Background:

    • Traditional interferometric profilers often lack stability due to environmental factors like piston microphonics.
    • Achieving absolute-phase measurement typically requires complex setups that can compromise common-path configurations.
    • Simultaneous measurement of both surface form and texture presents a significant metrological challenge.

    Purpose of the Study:

    • To introduce a new scanning common-path interferometric profiler designed for absolute-phase measurement.
    • To demonstrate the exceptional stability of the profiler by minimizing sensitivity to piston microphonics.
    • To enable simultaneous form and texture measurements using a single optical configuration.

    Main Methods:

    • Development of a scanning common-path interferometric profiler.

    Related Experiment Videos

  • Incorporation of a computer-generated hologram as the key beam-splitting element.
  • Experimental validation of the profiler's operation and stability in both scanning and single-shot modes.

    • Main Results:

    • The profiler achieves absolute-phase measurement with exceptional stability due to its common-path design.
    • The system effectively mitigates issues related to piston microphonics, enhancing measurement reliability.
    • Experimental results confirm the profiler's capability for simultaneous form and texture analysis.

    Conclusions:

    • The developed scanning common-path interferometric profiler offers a stable and versatile solution for absolute-phase metrology.
    • The use of a computer-generated hologram is key to the system's stability and dual-measurement capability.
    • This technology advances surface characterization by enabling simultaneous form and texture assessment.