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Proceedings Paper

Ultrahigh resolution optical coherence tomography at two infrared wavelength regions using a single light source
Author(s): Felix Spöler; Stefan Kray; Patrik Grychtol; Barbara Hermes; Jörg Bornemann; Michael Först; Heinrich Kurz
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Paper Abstract

An off-the-shelf turn-key supercontinuum light source based on a passively mode-locked fiber laser, a fiber amplifier and a highly nonlinear fiber is evaluated for its application in ultrahigh resolution optical coherence tomography (OCT). Two spectral bands - one red shifted and one blue shifted in reference to the wavelength of the fiber laser - are employed as low coherence sources in OCT. Usable spectral bandwidths exceed 300 nm centered either at 790 or 1340 nm, with corresponding coherence lengths of 1.2 and 2.6 μm, respectively. Optimization of the spectrum for simultaneous imaging at both spectral bands results in spectral bandwidths exceeding 200 nm for each band after filtering. A free-space OCT setup supporting the full spectral bandwidth is introduced which allows for ultrahigh resolution OCT imaging using both spectral bands simultaneously. Axial free space resolutions were measured to be less than 2 and 4 μm at 840 and 1230 nm, respectively. This approach combines ultrahigh resolution obtained at 840 nm with large penetration depths at 1230 nm. Frequency compounding of the OCT images can be used for speckle reduction while extracting spatially resolved spectroscopic features facilitates enhanced image contrast.

Paper Details

Date Published: 11 July 2007
PDF: 8 pages
Proc. SPIE 6627, Optical Coherence Tomography and Coherence Techniques III, 662704 (11 July 2007);
Show Author Affiliations
Felix Spöler, RWTH Aachen Univ. (Germany)
Stefan Kray, RWTH Aachen Univ. (Germany)
Patrik Grychtol, RWTH Aachen Univ. (Germany)
Barbara Hermes, Univ. Hospital RWTH Aachen (Germany)
Jörg Bornemann, Univ. Hospital RWTH Aachen (Germany)
Michael Först, RWTH Aachen Univ. (Germany)
Heinrich Kurz, RWTH Aachen Univ. (Germany)

Published in SPIE Proceedings Vol. 6627:
Optical Coherence Tomography and Coherence Techniques III
Peter E. Andersen; Zhongping Chen, Editor(s)

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