22 May 1997 Dispersion effects in partial coherence interferometry
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The resolution of partial coherence interferometry and optical coherence tomography depends on the spectral properties of the light source used. The minimum distance that can be resolved by these techniques is inversely proportional to the spectral width of the light source. Therefore strong efforts towards using light sources with larger spectral width are presently in progress. However, if the tissue under investigation is dispersive, the interferogram broadens and the resolution decreases. Based on properties of existing light sources, we calculate this signal broadening for trials with different dispersion and compare the results with measurements. On the other hand, light sources with different central wavelengths can be used to measure the group dispersion of a tissue. In this case, the interferograms obtained by partial coherence interferometry are shifted with respect to each other by an amount determined by the group dispersion. Using two superluminescent diodes with wavelengths of 814 and 855 nm, we present results of group dispersion measured in different media of human eyes in vivo. Based on these results we recommend optimum light sources for intraocular ranging.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christoph K. Hitzenberger, Christoph K. Hitzenberger, Wolfgang Drexler, Wolfgang Drexler, Angela Baumgartner, Angela Baumgartner, Adolf Friedrich Fercher, Adolf Friedrich Fercher, } "Dispersion effects in partial coherence interferometry", Proc. SPIE 2981, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications, (22 May 1997); doi: 10.1117/12.274319; https://doi.org/10.1117/12.274319

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