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    Area of Science:

    • Optical Physics
    • Holography
    • Biomedical Imaging

    Background:

    • Interferometric techniques are crucial for high-resolution imaging.
    • Single-wavelength phase imaging is limited in depth penetration and prone to noise.
    • Multi-wavelength approaches can improve imaging depth but often require complex setups or multiple exposures.

    Purpose of the Study:

    • To develop a novel interferometric setup for simultaneous acquisition of three wavelengths from a single sample instance.
    • To enable robust three-wavelength phase unwrapping for enhanced phase imaging.
    • To demonstrate the application of this technique for micro-channel profiling and label-free cell imaging.

    Main Methods:

    • An external interferometric setup was designed to project three off-axis holograms from different wavelengths onto a monochrome digital camera.
    • Each hologram utilized rotated fringe orientations to ensure no overlap in the spatial-frequency domain.
    • Full reconstruction of complex wavefronts from the three wavelength channels was achieved.

    Main Results:

    • The setup successfully acquired three-wavelength data simultaneously without scanning or multiple exposures.
    • Three-wavelength phase unwrapping was performed, allowing for phase imaging of thicker objects.
    • The technique demonstrated reduced noise levels compared to traditional single-wavelength methods.
    • Successful application in micro-channel profiling and label-free cell imaging was shown.

    Conclusions:

    • The proposed three-wavelength interferometric setup offers a significant advancement for phase imaging.
    • It overcomes limitations of single-wavelength methods by enabling deeper penetration and reduced noise.
    • This technique holds promise for label-free imaging of biological samples and microfluidic devices.