Simultaneous multi-spatial scanning optical coherence tomography (OCT) based on spectrum-slicing of a broadband source

Taye Mekonnen, Agisilaos Kourmatzis, Jason Amatoury, Shaokoon Cheng

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper reports the characterization of a novel daisy-chained multi-channel optical coherence tomography (MC-OCT) method capable of concurrent scanning at multiple sites along the sample arm length of a low coherence interferometer. For this study, a cascade of two wavelength-based beam splitters is used to split the sample arm beam into three channels, forming three imaging (sensing) units. Channel-specific free-space beam paths are introduced in the sample arm to ensure equal optical path lengths amongst the different sensing beams, and hence, a single reference reflector is employed for simultaneous interrogation of signals reflected from samples (or from different spots of a sample). Realistic simulation is carried out to study the properties of the interference patterns such as axial resolutions and spurious side-lobes. Using a broadband light source of 50 nm bandwidth at 840 nm centre wavelength, the achieved axial resolutions of 24.23 µm, 17.81 µm and 20.49 µm for channels 1, 2 and 3, respectively, are in good correlation with simulations. Experimental results on a 3D-printed phantom further validate the imaging functionality of the system. The findings demonstrate a new single source and single interferometric-based MC-OCT method that can feasibly improve the transverse-scan throughput of conventional OCT.

Original languageEnglish
Article number045203
Pages (from-to)1-9
Number of pages9
JournalMeasurement Science and Technology
Volume30
Issue number4
DOIs
Publication statusPublished - Apr 2019

Keywords

  • optical coherence tomography
  • interferometer
  • multi-channel
  • concurrent scanning
  • imaging unit
  • wavelength channel

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