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Multifocus tomographic algorithm for measuring optically thick specimens.

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    A new tomographic algorithm reconstructs 2D refractive index fluctuations in optically thick objects using multiple focal and angular views. This method enhances optical fiber analysis and other large-specimen imaging challenges.

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    Area of Science:

    • Optical Physics
    • Image Reconstruction
    • Materials Science

    Background:

    • Accurate characterization of refractive index is crucial for optical materials.
    • Existing tomographic methods face challenges with optically thick phase objects.
    • Transverse dimensions often exceed imaging system depth-of-field.

    Purpose of the Study:

    • To introduce a novel tomographic algorithm for 2D refractive index reconstruction.
    • To validate the algorithm using interference microscopy of optical fibers.
    • To demonstrate broad applicability in optical metrology and imaging.

    Main Methods:

    • Developed a tomographic algorithm utilizing 1D projections.
    • Acquired projections at multiple focal positions and angular orientations.
    • Applied the algorithm to reconstruct refractive index fluctuations in optical fibers.

    Main Results:

    • Successfully reconstructed 2D refractive index fluctuations.
    • Validated the method with measurements of multicore and microstructured optical fibers.
    • Demonstrated the algorithm's effectiveness for optically thick phase objects.

    Conclusions:

    • The novel tomographic algorithm provides accurate 2D refractive index reconstruction.
    • The method is suitable for optically thick specimens where transverse dimensions are large.
    • This technique offers significant benefits for optical fiber metrology and other imaging applications.