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Down-conversion en-face optical coherence tomography

Podoleanu, Adrian G.H., Cernat, Ramona, Bradu, Adrian (2019) Down-conversion en-face optical coherence tomography. Biomedical Optics Express, 10 (2). pp. 772-788. ISSN 2156-7085. (doi:10.1364/BOE.10.000772)

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We present an Optical Coherence Tomography (OCT) method that can deliver an en-face OCT image from a sample in real-time, irrespective of the tuning speed of the swept source. The method, based on the Master Slave interferometry technique, implements a coherence gate principle by requiring that the optical path difference (OPD) between the arms of an imaging interferometer is the same with the OPD in an interrogating interferometer. In this way, a real-time en-face OCT image can originate from a depth in the sample placed in the imaging interferometer, selected by actuating on the OPD in the interrogating interferometer, while laterally scanning the incident beam over the sample. The generation of the en-face image resembles time domain OCT, with the difference that here the signal is processed based on spectral domain OCT. The optoelectronic processor operates down-conversion of the chirped radio frequency signal delivered by the photo-detector. The down-conversion factor is equal to the ratio of the maximum frequency of the photo-detected signal due to an OPD value matching the coherence length of the swept source, to the sweeping rate. This factor can exceed 106 for long coherence swept sources.

Item Type: Article
DOI/Identification number: 10.1364/BOE.10.000772
Subjects: R Medicine > R Medicine (General) > R857.O6 Optical instruments
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Depositing User: Adrian Bradu
Date Deposited: 24 Jan 2019 17:30 UTC
Last Modified: 26 Jan 2020 04:11 UTC
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