Lensless single-shot dual-wavelength digital holography with sub-pixel resolution and centimeter depth range
H. Shangguan (TU Delft - ImPhys/Kalkman group)
Paul Urbach (TU Delft - ImPhys/Adam group)
J. Kalkman (TU Delft - ImPhys/Computational Imaging, TU Delft - ImPhys/Kalkman group)
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Abstract
Lensless single-shot dual-wavelength digital holography is resolution limited by the pixel-size of the camera and often has an insufficient depth range. We present a novel dual-wavelength holographic configuration with expanding wavefront illumination that breaks the pixel-limited resolution barrier and achieves diffraction-limited spatial resolution. By implementing expanding wavefront illumination with dual-wavelength digital holography based on a wavelength-tunable laser, we achieve a high-resolution centimeter-scale depth range. A quantitative precision analysis demonstrates that single-shot acquisition reaches the shot-noise-limited depth detection. The proposed holographic scheme provides a robust 3D optical inspection solution for high-throughput, micro-scale resolution industrial inline metrology.
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