Dispersion effects in partial coherence interferometry

Christoph K. Hitzenberger; Wolfgang Drexler; Angela Baumgartner; Adolf Friedrich Fercher

doi:10.1117/12.274319

22 May 1997 Dispersion effects in partial coherence interferometry

Christoph K. Hitzenberger, Wolfgang Drexler, Angela Baumgartner, Adolf Friedrich Fercher

Proceedings Volume 2981, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications; (1997) https://doi.org/10.1117/12.274319
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

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.

Citation Download Citation

Christoph K. Hitzenberger, Wolfgang Drexler, Angela Baumgartner, and 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); https://doi.org/10.1117/12.274319

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