Depth of focus extension in optical coherence tomography via multiple aperture synthesis (doi:10.21979/N9/LJHRKF)

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Depth of focus extension in optical coherence tomography via multiple aperture synthesis

doi:10.21979/N9/LJHRKF

DR-NTU (Data)

2018-01-28

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Bo, En, 2018, "Depth of focus extension in optical coherence tomography via multiple aperture synthesis", https://doi.org/10.21979/N9/LJHRKF, DR-NTU (Data), V1

Depth of focus extension in optical coherence tomography via multiple aperture synthesis

doi:10.21979/N9/LJHRKF

Bo, En (Nanyang Technological University)

Matlab

DR-NTU (Data)

Bo, En

Bo, En

2018-01-28

https://doi.org/10.21979/N9/LJHRKF

Physics, Physics, Optical Coherence Tomography, depth of focus, multiple aperture synthesis

In this paper, we report a novel technique for overcoming the depth of focus (DOF) limitation in optical coherence tomography (OCT). Using confocal optics on a sample arm, we scanned the illumination beam across the under-filled objective lens pupil plane by steering the beam at the pinhole using a micro-cylindrical lens. The detected interferometric signals from multiple distinctive apertures were digitally refocused, which is analogous to synthetic aperture radar (SAR). Using numerical simulations and imaging experiments, we verified that this technique can maintain a diffraction-limited transverse resolution along a DOF that is ~10 times larger than the confocal parameter. The ability to extend the DOF without signal loss and sidelobe artifacts may ultimately overcome the DOF limitation in high-resolution OCT.

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2017. Optica. DOF extension in OCT via MAS.pdf

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