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Adaptive interferometric null testing for unknown freeform optics metrology.

Lei Huang, Heejoo Choi, Wenchuan Zhao

    Optics Letters
    |December 2, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an adaptive interferometric null testing method using a deformable mirror to overcome dynamic range limitations in freeform optics metrology. The technique successfully measures unknown optical surfaces, guiding manufacturing processes.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Freeform Optics

    Background:

    • Conventional null testing methods for optics face dynamic range limitations.
    • Metrology for unknown freeform optics requires measurements during fabrication.

    Purpose of the Study:

    • To develop an adaptive interferometric null testing method for unknown freeform optics.
    • To overcome dynamic range limitations in optical surface metrology.

    Main Methods:

    • An adaptive null component using a deformable mirror was employed.
    • The stochastic parallel gradient descent algorithm optimized the deformable mirror's shape.
    • A deflectometry system controlled the deformable mirror.

    Main Results:

    • The adaptive interferometric null testing setup demonstrated superb adaptive capability.
    • The method successfully measured an unknown optical surface.

    Conclusions:

    • The adaptive method effectively overcomes dynamic range limitations in null testing.
    • This technique is valuable for optics manufacturing processes requiring in-situ measurements.