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Digital wavefront measuring interferometer for testing optical surfaces and lenses.

J H Bruning, D R Herriott, J E Gallagher

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel interferometer system using a photodiode array and minicomputer to measure wavefront phase to lambda/100 accuracy. The system minimizes environmental effects and allows for automatic subtraction of wavefront errors, enhancing optical testing efficiency.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Interferometry

    Background:

    • Traditional optical testing methods can be time-consuming and susceptible to environmental factors.
    • Accurate wavefront measurement is crucial for evaluating diffraction-limited optical systems.

    Purpose of the Study:

    • To develop a rapid and accurate system for measuring wavefront phase using a photodiode array.
    • To enable automatic correction of wavefront errors in interferometric measurements.
    • To provide comprehensive optical system analysis, including point spread function and optical transfer function.

    Main Methods:

    • Utilizes a 1024-element photodiode array to sample interference pattern intensities in a 32x32 matrix.
    • Employs piezoelectric control for reference arm length variation.
    • Applies Fourier series method for synchronous phase detection at 1024 points.
    • Incorporates averaging techniques to mitigate effects of air turbulence, vibrations, and thermal drifts.

    Main Results:

    • Achieves wavefront phase measurement accuracy of lambda/100.
    • Enables wavefront error determination and automatic subtraction.
    • Generates contour and perspective plots of wavefronts in under one minute.
    • Transforms wavefront data into point spread function and optical transfer function (modulus and phase) via FFT programs.

    Conclusions:

    • The developed system offers high accuracy and speed for wavefront measurement, significantly improving optical testing efficiency.
    • Automatic wavefront error correction capabilities streamline the evaluation of optical components and systems.
    • The system's ability to analyze optical transfer functions makes it valuable for assessing diffraction-limited performance.