Optic axis determination by fiber-based polarization-sensitive swept-source optical coherence tomography

Zenghai Lu; Deepa K. Kasaragod; Stephen J. Matcher

doi:10.1117/12.875081

11 February 2011 Optic axis determination by fiber-based polarization-sensitive swept-source optical coherence tomography

Zenghai Lu, Deepa K. Kasaragod, Stephen J. Matcher

Author Affiliations +

Proceedings Volume 7889, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV; 78890W (2011) https://doi.org/10.1117/12.875081
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

We describe a fiber-based variable-incidence-angle (VIA) polarization-sensitive swept-source optical coherence tomography (PS-SS-OCT) system to determine the 3-D optical axis of birefringent biological tissues. Single-plane VIAPS- OCT is also explored which requires measurement of the absolute fast-axis orientation. A state-of-the-art PS-SS-OCT system with some improvements both in hardware and software was used to determine the apparent optical birefringence of equine tendon for a number of different illumination directions. Polar and azimuthal angles of cut equine tendon were produced by VIA method and compared with the nominal values. A quarter waveplate (QWP) and equine tendon were used as test targets to validate the fast-axis measurements using the system. Polar and azimuthal angles of cut equine tendon broadly agreed with the expected values within about 8% of the nominal values. A theoretical and experimental analysis of the effect of the sample arm fiber on determination of optical axis orientation using a proposed definition based on the orientation of the eigenpolarization ellipse experimentally confirms that this algorithm only works correctly for special settings of the sample arm fiber. A proposed algorithm based on the angle between Stokes vectors on the Poincaré sphere is confirmed to work for all settings of the sample arm fiber. A calibration procedure is proposed to remove the sign ambiguity of the measured orientation and was confirmed experimentally by using the QWP.

Citation Download Citation

Zenghai Lu, Deepa K. Kasaragod, and Stephen J. Matcher "Optic axis determination by fiber-based polarization-sensitive swept-source optical coherence tomography", Proc. SPIE 7889, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV, 78890W (11 February 2011); https://doi.org/10.1117/12.875081

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KEYWORDS

Birefringence

Optical coherence tomography

Polarization

Tissues

Wave plates

Calibration

Modulation

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