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Updated: Jul 1, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)
Published on: August 4, 2018
Dual femtosecond laser multiheterodyne optical coherence tomography
Stefan Kray1, Felix Spöler, Michael Först
1Institut für Halbleitertechnik, Rheinisch-Westfälische Technische Hochschule Aachen, Sommerfeldstrasse 24, Aachen, Germany. kray@iht.rwth-aachen.de
Abstract:
A time domain optical coherence tomography (OCT) system without moving parts is described, which is based on multiheterodyning utilizing two mode-locked femtosecond lasers. By synchronizing the two lasers to slightly different repetition rates and coupling to an interferometric OCT setup, we obtain amplitude-modulated beat signals representing the structure of the specimen under investigation. Our system is suitable for biological imaging as well as technical applications. We demonstrate high axial imaging depths of 150 mm with up to 5000 axial scans per second, achieving equivalent path scanning velocities of 750 m/s.
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