20 March 2013 Off-axis full-field swept-source optical coherence tomography using holographic refocusing
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Abstract
We demonstrate a full-field swept-source OCT using an off-axis geometry of the reference illumination. By using holographic refocusing techniques, a uniform lateral resolution is achieved over the measurement depth of approximately 80 Rayleigh lengths. Compared to a standard on-axis setup, artifacts and autocorrelation signals are suppressed and the measurement depth is doubled by resolving the complex conjugate ambiguity. Holographic refocusing was done efficiently by Fourier-domain resampling as demonstrated before in inverse scattering and holoscopy. It allowed to reconstruct a complete volume with about 10μm resolution over the complete measurement depth of more than 10mm. Off-axis full-field swept-source OCT enables high measurement depths, spanning many Rayleigh lengths with reduced artifacts.
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Dierck Hillmann, Gesa Franke, Laura Hinkel, Tim Bonin, Peter Koch, Gereon Hüttmann, "Off-axis full-field swept-source optical coherence tomography using holographic refocusing", Proc. SPIE 8571, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVII, 857104 (20 March 2013); doi: 10.1117/12.2006436; https://doi.org/10.1117/12.2006436
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