Optimal source bandwidth for pass-through photon-based trans-illumination interferometry

Paulino Vacas-Jacques; Marija Strojnik; Gonzalo Paez

doi:10.1117/12.765026

5 March 2008 Optimal source bandwidth for pass-through photon-based trans-illumination interferometry

Paulino Vacas-Jacques, Marija Strojnik, Gonzalo Paez

Proceedings Volume 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII; 68472S (2008) https://doi.org/10.1117/12.765026
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

We elaborate further the partial coherence model for the trans-illumination interferometric experiment, by including a phase-locked device at detection plane. We demonstrate that the detected isolated signal, and thus the quality of the optical properties depend on the coherence characteristics of the source. We introduce a specific measure of coherence time for discrimination purposes, such that a photon arriving at a greater time will be efficiently filtered. The quantification of the coherence study is presented by computing the analytical interferograms for different radiation sources (Broadband source, SLED, LED, and Laser). We show that the use of a low-coherence source improves the detection of ballistic photons, at the coherence length of the source, by orders of magnitude. As a result of this study, we suggest the use of a low-coherence source, with reduced bandwidth (coherence lengths ranging from 1 - 100 μm) and compact spatial distribution, for tissue characterization purposes. For imaging of tissues, a low-coherence source with greater bandwidth is preferable, because such source effectively isolates pass-through and single scattered photons.

Citation Download Citation

Paulino Vacas-Jacques, Marija Strojnik, and Gonzalo Paez "Optimal source bandwidth for pass-through photon-based trans-illumination interferometry", Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 68472S (5 March 2008); https://doi.org/10.1117/12.765026

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