Off-axis reference beam for full-field swept-source OCT and holoscopy

Dierck Hillmann*, Hendrik Spahr, Helge Sudkamp, Carola Hain, Laura Hinkel, Gesa Franke, Gereon Hüttmann

*Corresponding author for this work


In numerous applications, Fourier-domain optical coherence tomography (FD-OCT) su ers from a limited imaging depth due to signal roll-o, a limited focal range, and autocorrelation noise. Here, we propose a parallel full-field FD-OCT imaging method that uses a swept laser source and an area camera in combination with an o -axis reference, which is incident on the camera at a small angle. As in digital o -axis holography, this angle separates autocorrelation signals and the complex conjugated mirror image from the actual signal in Fourier space. We demonstrate that by reconstructing the signal term only, this approach enables full-range imaging, i.e., it increases the imaging depth by a factor of two, and removes autocorrelation artifacts. The previously demonstrated techniques of inverse scattering and holoscopy can then numerically extend the focal range without loss of lateral resolution or imaging sensitivity. The resulting, significantly enhanced measurement depth is demonstrated by imaging a porcine eye over its entire depth, including cornea, lens, and retina. Finally, the feasibility of in vivo measurements is demonstrated by imaging the living human retina.

Original languageEnglish
JournalOptics Express
Issue number22
Pages (from-to)27770-27784
Number of pages15
Publication statusPublished - 30.10.2017

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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