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Updated: Feb 20, 2026

Design and Development of a Three-Dimensionally Printed Microscope Mask Alignment Adapter for the Fabrication of Multilayer Microfluidic Devices
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Pseudo-random masks for angular alignment.

Cristina M Gómez-Sarabia, Luis M Ledesma-Carrillo, Cipriano Guzmán-Cano

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    |October 20, 2017
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    Summary
    This summary is machine-generated.

    This study introduces an alignment technique using angular correlations and masks for precise optical system alignment. The method effectively tests varifocal lens performance, even with broadband light.

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    Area of Science:

    • Optics and Photonics
    • Optical Metrology

    Background:

    • Accurate alignment is crucial for optical system performance.
    • Existing alignment techniques may lack robustness or be sensitive to magnification.

    Purpose of the Study:

    • To develop a novel alignment technique exploiting angular correlations.
    • To assess the technique's suitability for testing varifocal lenses.
    • To demonstrate robustness against broadband light.

    Main Methods:

    • Utilized a pair of masks encoding pseudo-random sequences in an angular format.
    • Developed an angular correlator generating peaked irradiance distributions upon alignment.
    • Defined a merit function to quantify tolerance to focus errors.

    Main Results:

    • The angular correlator demonstrated peaked on-axis irradiance when mask pairs were aligned.
    • On-axis irradiance decreased significantly when elements were misaligned.
    • The technique proved independent of lateral magnification, suitable for varifocal lens testing.
    • Effectiveness was confirmed with linearly polarized, broadband light.

    Conclusions:

    • The proposed angular correlation technique offers a robust method for optical alignment.
    • Its magnification independence makes it ideal for evaluating varifocal lens performance.
    • The technique is effective across a range of lighting conditions, including broadband spectra.