28 February 2008 Common path swept-source OCT interferometer with artifact removal
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We present here the implementation of a fiber-based common-path interferometer for Swept Source Optical Coherence Tomography (SS-OCT). A common path configuration is often a suitable approach for increasing the stability of the measurements. Optical fibers are sensitive to temperature and some other mechanical perturbations which compromise absolute accuracy measurements. A common-path configuration provides a mean to define a reference at the probe location and, thereby, to compensate for the optical path length perturbations. Additionally, in SS-OCT, we have to deal with autocorrelation noise and the mirror image artifact due to the computation of the Fourier transform. Thus, our common-path implementation also includes acousto-optics modulators to remove the depth degeneracy as it has already been done when using a "traditional" interferometer configuration. The efficiency of our system is validated by comparing images acquired with a "traditional" SS-OCT configuration and with our common path SS-OCT configuration.
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S. Vergnole, S. Vergnole, G. Lamouche, G. Lamouche, M. Dufour, M. Dufour, B. Gauthier, B. Gauthier, "Common path swept-source OCT interferometer with artifact removal", Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 68472W (28 February 2008); doi: 10.1117/12.761836; https://doi.org/10.1117/12.761836

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