30 April 1999 Differential phase measurements by partial coherence interferometry
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Proceedings Volume 3598, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications III; (1999); doi: 10.1117/12.347483
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States
Abstract
In the past ten years, partial coherence interferometry has been developed and applied to high precision measurements of various biological and technical materials. This technique was extended to a high resolution, non contact imaging technique: optical coherence tomography (OCT). Recently, OCT was extended to perform polarization sensitive measurements and imaging. In this case, small phase variations caused by birefringence are measured and imaged. Small phase differences between adjacent beams can also be caused by other circumstances, e.g. by slight variations of geometric path length or refractive index. We present a method to measure these phase differences as a function of longitudinal and lateral position in the object. This method allows to determine the path length gradient with a resolution on the order of 10-5. Furthermore, we report first results obtained in simple test objects and present first differential phase contrast OCT tomograms.
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Christoph K. Hitzenberger, Angela Baumgartner, Harald Sattmann, Adolf Friedrich Fercher, "Differential phase measurements by partial coherence interferometry", Proc. SPIE 3598, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications III, (30 April 1999); doi: 10.1117/12.347483; http://dx.doi.org/10.1117/12.347483
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KEYWORDS
Polarization

Optical coherence tomography

Phase measurement

Glasses

Interfaces

Interferometry

Refractive index

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