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arXiv · 1904.01445

Simultanous two-wavelength phase unwrapping using external module for multiplexing off-axis holography

Nir A. Turko·Natan T. Shaked
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Abstract

We present a dual-wavelength external holographic microscopy module for quantitative phase imaging of 3D structures with extended thickness range. This is done by simultaneous acquisition of two off-axis interferograms, each of which at a different wavelength, and generation of a synthetic wavelength, which is larger than the sample optical thickness, allowing two-wavelength unwrapping. The simultaneous acquisition is carried out by using optical multiplexing of the two interferograms onto the camera, where each of them has orthogonal off-axis interference fringe direction in relation to the other one. We used the system to quantitatively image a 7.96 um step target and 30.5 um circular copper pillars.

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Nir A. Turko, Natan T. Shaked. 2019-04-02. Simultanous two-wavelength phase unwrapping using external module for multiplexing off-axis holography. https://doi.org/10.1364/ol.42.000073

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