Absorption and dispersion measurements of water, D2O, and acetone by phase resolved PCI and OCT in the mid-infrared range 1.3 um to 2.0 um

Michael Pircher; Christoph K. Hitzenberger; Markus Sticker; Adolf Friedrich Fercher

doi:10.1117/12.470465

14 June 2002 Absorption and dispersion measurements of water, D₂O, and acetone by phase resolved PCI and OCT in the mid-infrared range 1.3μ m to 2.0 μm

Michael Pircher, Christoph K. Hitzenberger, Markus Sticker, Adolf Friedrich Fercher

Author Affiliations +

Proceedings Volume 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI; (2002) https://doi.org/10.1117/12.470465
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

We present a phase resolved partial coherence interferometer (PR-PCI) to measure absorption and dispersion of water and some other liquids. For that purpose we are investigating three different methods. In the first method we obtain spectral information of the sample by Fourier-transforming the interferometric signal. To correct for variations in scanning motor speed the interferometric signals are corrected by a signal obtained from an auxiliary He-Ne laser interferometer. The spectral information is used to calculate the absorption cross sections of several liquids like water, Deuterium oxide and acetone. The second method investigated is based on measurement of dispersion with an algorithm already introduced for differential phase contrast imaging to extract the phase information of the interferometric signal obtained by two short coherence light sources. Thereby we calculated the difference in the optical path lengths from the phase difference of the two light sources resulting from dispersion of the sample with high precision. This phase difference was used to calculate the sample dispersion. The third method is based on a differential absorption technique. The amplitude of two SLDs with different center wavelengths, one center wavelength within and one outside a water absorption band, were recorded. By measuring the difference of the amplitudes of the two signals we obtain the different extinction of the light beams when propagating through dense tissue.

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Michael Pircher, Christoph K. Hitzenberger, Markus Sticker, and Adolf Friedrich Fercher "Absorption and dispersion measurements of water, D₂O, and acetone by phase resolved PCI and OCT in the mid-infrared range 1.3μ m to 2.0 μm", Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); https://doi.org/10.1117/12.470465

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KEYWORDS

Absorption

Light sources

Beam splitters

Interferometry

Scattering

Water

Mirrors

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