Izvestiya of Saratov University.


ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)

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Vacas-Jacque P., Ryabukho V. P., Strojnik M., Tuchin V. V., Paez G. Ballistic Auto-Correlation Interferometry. Izvestiya of Saratov University. Physics , 2009, vol. 9, iss. 2, pp. 3-13. DOI: 10.18500/1817-3020-2009-9-2-3-13

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Ballistic Auto-Correlation Interferometry

Vacas-Jacque Paulino, Centra de Investigaciones en Optica (Leon)
Ryabukho Vladimir Petrovich, Saratov State University
Strojnik Marija, Centra de Investigaciones en Optica (Leon)
Tuchin Valery Viсtorovich, Science Medical Center, Saratov State University
Paez Gonzalo, Centra de Investigaciones en Optica (Leon)

We propose the implementation of a ballistic auto-correlation interferometer (BAI) for the assessment of biological tissues. We develop the theory of the interferometric technique, and demonstrate that a method to isolate ballistic from forward-scattered contributions is of central importance. We, therefore, propose theoretically and experimentally a non-linear grating-based angular filter. A monochromatic source incident on a ruled grating, positioned at grazing diffraction, is followed by a narrow slit to conform the proposed system. We validate the angular amplification experimentally, with values ranging on the order of 10-20X. In addition, similar values of transversal beam size reduction, provide an efficient -100X filtering scheme. As a preliminary study for the implementation of the BAI, we compare two transillumination schemes, which include and exclude the grating-based angular filter. Our preliminary results are encouraging, and indicate that the filter effectively isolates the information needed in the BAI.


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