Path length distribution of multiple-scattered photons by low-coherence Doppler interferometry

Anna L. Petoukhova; Wiendelt Steenbergen; Frits F. M. de Mul

doi:10.1117/12.470463

14 June 2002 Path length distribution of multiple-scattered photons by low-coherence Doppler interferometry

Anna L. Petoukhova, Wiendelt Steenbergen, Frits F. M. de Mul

Proceedings Volume 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI; (2002) https://doi.org/10.1117/12.470463
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

We report results of measurements by low coherence Doppler interferometry of the path length distribution of photons undergoing multiple scattering in a highly turbid medium. We use a Mach-Zehnder interferometer with multimode graded index fibers and a superluminescent diode as light source. The path length distribution is obtained by recording the heterodyne fluctuations arising due to the Brownian motion of particles in an Intralipid suspension as a function of the optical path length. The experimental path length distribution is in good agreement with predictions of Monte Carlo simulations. In the heterodyne spectrum an increase of the mean Doppler frequency with the path length is observed. The path length resolution of the setup was directly evaluated by replacing the turbid medium with randomly moving scatterers by a mirror attached to a harmonically oscillating piezo-element. The maximum (peak-to-peak) mirror displacement was 10% of the optical wavelength. We observed a narrow and strong (signal/noise ratio ~300) interference peak with the full width at the half maximum ~50 microns equal to the coherence length of the superluminescent diode. However, additional weaker satellite peaks are also observed, which may be caused by the intermodal dispersion in our multimode fibers. We demonstrate that our setup allows achieving high path length resolution for biological tissues where the width of the path length distribution is several millimeters.

Citation Download Citation

Anna L. Petoukhova, Wiendelt Steenbergen, and Frits F. M. de Mul "Path length distribution of multiple-scattered photons by low-coherence Doppler interferometry", Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); https://doi.org/10.1117/12.470463

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KEYWORDS

Doppler effect

Multimode fibers

Mirrors

Photons

Heterodyning

Interferometry

Light scattering

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